Rajca Research Group

Organic, Polymer and Biomaterials Chemistry
Rational Designs | Syntheses | Measurements
Publications
JACS
126. Ying Wang, Arnon Olankitwanit,, Suchada Rajca, and Andrzej Rajca, “Intramolecular Hydrogen Atom Transfer in Aminyl Radical at Room Temperature with Large Kinetic Isotope Effect”, J. Am. Chem. Soc., 2017, 139, Just Accepted Manuscript. DOI:10.1021/jacs.7b02692.
JOC
125. Shengdian Huang, Joseph T. Paletta, Hanan Elajaili, Kirby Huber, Maren Pink, Suchada Rajca, Gareth R. Eaton, Sandra S Eaton, and Andrzej Rajca, “Synthesis and Electron Spin Relaxation of Tetra-Carboxylate Pyrroline Nitroxides”, J. Org. Chem., 2017, 82, 1538–1544. DOI:10.1021/acs.joc.6b02737.
JACS
124. Sheng Zhang, Xinming Liu, Chunli Li, Lu Li, Jinsheng Song, Jianwu Shi, Martha D. Morton, Suchada Rajca, Andrzej Rajca, and Hua Wang, “Thiophene-based Double Helices: Syntheses, X-ray Structures and Chiroptical Properties”, J. Am. Chem. Soc., 2016, 138, 10002–10010. DOI:10.1021/jacs.6b05709. Highlighted in Synfacts: Timothy M. Swager, Cagatay Dengiz, Synfacts, 2016, 12, 1036. DOI:10.1055/s-0036-1589283.
JACS
123. Nolan M. Gallagher, Jackson J. Bauer, Maren Pink, Suchada Rajca, and Andrzej Rajca, “High Spin Organic Diradical with Robust Stability”, J. Am. Chem. Soc., 2016, 138, 9377–9380. DOI:10.1021/jacs.6b05080.
JACS
122. Ying Wang, Hui Zhang, Maren Pink, Arnon Olankitwanit, Suchada Rajca, and Andrzej Rajca, “Radical Cation and Neutral Radical of Aza-thia[7]helicene with SOMO−HOMO Energy Level Inversion”, J. Am. Chem. Soc., 2016, 138, 7298–7304 DOI:10.1021/jacs.6b01498.
ACS Appl. Mater. Interfaces
121. Francesca Ciccullo, Nolan Gallagher, Olympia Geladari, Thomas Chasse, Andrzej Rajca, and Maria Benedetta Casu, “A Derivative of the Blatter Radical as a Potential Metal-Free Magnet for Stable Thin Films and Interfaces”, ACS Appl. Mater. Interfaces, 2016, 8, 1805–1812 DOI:10.1021/acsami.5b09693.
JOC
120. Arnon Olankitwanit, Suchada Rajca, Andrzej Rajca, “Aza-m-Xylylene Diradical with Increased Steric Protection of the Aminyl Radicals”, J. Org. Chem., 2015, 80, 5035–5044 DOI:10.1021/acs.joc.5b00421.
BiophysJ
119. Virginia Meyer, Michael A. Swanson, Laura J Clouston, Przemysław J. Boratyński, Richard Stein, Hassane S. Mchaourab, Andrzej Rajca, Sandra S. Eaton, Gareth R. Eaton, “Room Temperature Distance Measurements of Immobilized Spin Labeled Protein by Double Electron–Electron Resonance Spectroscopy”, Biophys. J., 2015, 108, 1213–1219. DOI:10.1016/j.bpj.2015.01.015.
JOC
118. Nolan Gallagher, Arnon Olankitwanit, Andrzej Rajca, “High-Spin Organic Molecules”, J. Org. Chem., 2015, 80, 1291–1298 (JOCSynopsis). DOI:10.1021/jo502505r.
NatCommun
117. Molly. A. Sowers, Jessica. R. McCombs, Ying. Wang, Joseph T. Paletta, Stephen. W. Morton, Erik. C. Dreaden, Michael. D. Boska, M. Francesca. Ottaviani, Paula. T. Hammond, Andrzej. Rajca, Jeremiah. A. Johnson, “Redox-responsive branched-bottlebrush polymers for in vivo MRI and fluorescence imaging”, Nat. Commun., 5, Article number: 5460. DOI:10.1038/ncomms6460. [MIT News | NIBIB Science Highlight]
JACS
116. Arnon Olankitwanit, Maren Pink, Suchada Rajca, Andrzej Rajca, “Synthesis of Aza-m-Xylylene Diradicals with Large Singlet-Triplet Energy Gap and Statistical Analyses of their EPR Spectra”, J. Am. Chem. Soc., 2014, 136, 14277–14288. DOI:10.1021/ja508119d
OrgLett
115. Ying Wang, Joseph Paletta, Kathleen Berg, Erin Reinhart, Suchada Rajca, Andrzej Rajca, “Synthesis of Unnatural Amino Acids Functionalized with Sterically Shielded Pyrroline Nitroxides”, Org. Lett., 2014, 16, 5298–5300.DOI:10.1021/ol502449r.
OrgLett
114. Zhelin Yu, Richard W. Quine, George A. Rinard, Mark Tseitlin, Hanan Elajaili, Velavan Kathirvelu, Laura J. Clouston, Przemyslaw J. Boratynski, Andrzej Rajca, Richard A. Stein, Hassane Mchaourab, Sandra S. Eaton, Gareth R. Eaton, “Rapid-Scan EPR of Immobilized Nitroxides”, J. Magn. Reson., 2014, 247, 67–71. DOI: 10.1016/j.jmr.2014.08.008.
JACS
113. Andrzej Rajca, Arnon Olankitwanit, Ying Wang, Przemyslaw J. Boratynski, Maren Pink, and Suchada Rajca, “High-Spin S = 2 Ground State Aminyl Tetraradicals”, J. Am. Chem. Soc., 2013, 135, 18205–18215. DOI:10.1021/ja409472f. Highlighted in Synfacts: Timothy M. Swager, Joseph M. Azzarelli, Synfacts, 2014, 10, 0142. DOI:10.1055/s-0033-1340602 [Spotlights on Recent JACS Publications]
OrgLett
112. Joseph T. Paletta, Maren Pink, Bridget Foley, Suchada Rajca, Andrzej Rajca, “Synthesis and Reduction Kinetics of Sterically Shielded Pyrrolidine Nitroxides”, Org. Lett., 2012, 14, 5322–5325. DOI:10.1021/ol302506f
JACS
111. Andrzej Rajca, Ying Wang, Michael Boska, Joseph T. Paletta, Arnon Olankitwanit, Michael A. Swanson, Deborah G. Mitchell, Sandra S. Eaton, Gareth R. Eaton, Suchada Rajca,“Organic Radical Contrast Agents for Magnetic Resonance Imaging”, J. Am. Chem. Soc., 2012, 134, 15724–15727. DOI:10.1021/ja3079829 [Correction, DOI:10.1021/ja413028d] [JACS In C&EN]
OrgLett
110. Makoto Miyasaka, Maren Pink, Arnon Olankitwanit, Suchada Rajca, Andrzej Rajca, “Band Gap of Carbon-Sulfur [n]Helicenes”, Org. Lett., 2012, 14, 3076–3079. DOI:10.1021/ol3011437. Highlighted in Synfacts: Timothy M. Swager, Gregory D. Gutierrez, Synfacts, 2012, 8, 0964. DOI:10.1055/s-0032-1317089
JOC
109. Andrzej Rajca, Przemyslaw J. Boratynski, Arnon Olankitwanit, Kouichi Shiraishi, Maren Pink, Suchada Rajca , “Ladder Oligo(m-aniline)s: Derivatives of Azaacenes with Cross-Conjugated π-Systems”, J. Org. Chem., 2012, 77, 2107–2120 (Featured Article). DOI:10.1021/jo2025948. Highlighted in Synfacts: Timothy M. Swager, John B. Goods, Synfacts, 2012, 8, 0502. DOI:10.1055/s-0031-1290840
JOC
108. Andrzej Rajca, Kouichi Shiraishi, Przemyslaw J. Boratynski, Maren Pink, Makoto Miyasaka, Suchada Rajca, “Oxidation of Annelated Diarylamines: Analysis of Reaction Pathways to Nitroxide Diradical and Spirocyclic Products”, J. Org. Chem., 2011, 76, 8447–8457. DOI:10.1021/jo2017923
ChemComm
107. Arnon Olankitwanit, Velavan Kathirvelu, Suchada Rajca, Gareth R. Eaton, Sandra S. Eaton, Andrzej Rajca, “Calix[4]arene nitroxide tetraradical and octaradical”, Chem. Commun., 2011, 47, 6443–6445. DOI:10.1039/C1CC11172H [From collection Supramolecular Chemistry]
JACS
106. Andrzej Rajca, Arnon Olankitwanit, Suchada Rajca, “Triplet Ground State Derivative of Aza-m-Xylylene Diradical with Large Singlet-Triplet Energy Gap”, J. Am. Chem. Soc., 2011, 133, 4750–4753. DOI:10.1021/ja200708b
eEROS
105. Ying Wang, Suchada Rajca, Andrzej Rajca, “Bis(benzenesulfonyl) Sulfide” (2011), Encyclopedia of Reagents for Organic Synthesis [Online], John Wiley & Sons Ltd. DOI: 10.1002/047084289X.rn01351
AngewChem
104. Przemyslaw J. Boratynski, Maren Pink, Suchada Rajca, Andrzej Rajca, “Isolation of the Triplet Ground State Aminyl Diradical”, Angew. Chem. Int. Ed., 2010, 49, 5459–5462. DOI:10.1002/anie.201002811
OrgLett
103. Makoto Miyasaka, Maren Pink, Suchada Rajca, Andrzej Rajca, “Spiro Oligothiophenes”, Org. Lett., 2010, 12, 3230–3233. DOI:10.1021/ol1011696. Highlighted in Synfacts: Timothy M. Swager, Joel Batson, Synfacts, 2010, 1136-1136. DOI: 10.1055/s-0030-1258632
Chem Euro J
102. Andrzej Rajca, Velavan Kathirvelu, Sandip K. Roy, Maren Pink, Suchada Rajca, Santanu Sarkar, Sandra S. Eaton, Gareth R. Eaton, “A Spirocyclohexyl Nitroxide Amino Acid Spin Label for Pulsed EPR Spectroscopy Distance Measurements”, Chem. Eur. J., 2010, 16, 5778–5782. DOI:10.1002/chem.200903102
JACS
101. Jerzy K. Zak, Makoto Miyasaka, Suchada Rajca, Mieczyslaw Lapkowski, Andrzej Rajca, “Radical Cation of Helical, Cross-Conjugated β-Oligothiophene”, J. Am. Chem. Soc., 2010, 132, 3246–3247. DOI: 10.1021/ja910076n
AngewChem
100. Andrzej Rajca, Suchada Rajca, “Asymmetric Synthesis of Chiral Tetraphenylenes”, Angew. Chem. Int. Ed., 2010, 49, 672–674. DOI: 10.1002/anie.200905421
JOC
99. Andrzej Rajca, Makoto Miyasaka, Shuzhang Xiao, Przemyslaw J. Boratynski, Maren Pink, Suchada Rajca, “Intramolecular Cyclization of Thiophene-Based [7]Helicenes to Quasi-[8]Circulenes”, J. Org. Chem., 2009, 74, 9105–9111. DOI: 10.1021/jo902030u
JOC
98. Andrzej Rajca, Makoto Miyasaka, Maren Pink, Shuzhang Xiao, Suchada Rajca, Kausik Das, Kristin Plessel, “Functionalized Thiophene-Based [7]Helicene: Chirooptical Properties versus Electron Delocalization”, J. Org. Chem., 2009, 74, 7504–7513. DOI: 10.1021/jo901769c
AngewChem
97. Makoto Miyasaka, Maren Pink, Suchada Rajca,Andrzej Rajca, “Noncovalent Interactions in the Asymmetric Synthesis of Rigid, Conjugated Helical Structures”, Angew. Chem. Int. Ed., 2009, 48, 5954–5957. DOI: 10.1002/anie.200901349 [Download]
ChemComm
96. Andrzej Rajca, Kouichi Shiraishi, Suchada Rajca, “Stable Diarylnitroxide Diradical with Triplet Ground State”, Chem. Commun., 2009, 4372–4374. DOI: 10.1039/b909741d
JACS
95. Andrzej Rajca, Matthew Vale, Suchada Rajca, “Diarylnitroxide Diradicals: Low-Temperature Oxidation of Diarylamines to Nitroxides”, J. Am. Chem. Soc., 2008, 130, 9099–9105. DOI: 10.1021/ja8016335
J.Sulfur. Chem
94. Shuzhang Xiao, Maren Pink, Hua Wang, Suchada Rajca, Andrzej Rajca, “Chiral Tetrathienylene: Synthesis and X-ray Structure” J. Sulfur Chem., 2008, 29, 425-432 (invited article in the special issue on Extreme Sulfur Chemistry) DOI: 10.1080/17415990802027263
JPCB
93. Hideo Sato, Velavan Kathirvelu, Gaëlle Spagnol, Suchada Rajca, Andrzej Rajca, Sandra S. Eaton, and Gareth R. Eaton “Impact of electron-electron spin interaction on electron spin relaxation of nitroxide diradicals and tetraradical in glassy solvents between 10 and 300 K” J. Phys. Chem. B, 2008, 112, 2818 -2828. DOI:10.1021/jp073600u
JOC
92. Matthew Vale, Maren Pink, Suchada Rajca, Andrzej Rajca, “Synthesis, Structure, and Conformation of Aza[1n]metacyclophanes”, J. Org. Chem. (Featured Article), 2008, 73, 27-35. DOI: 10.1021/jo702151n
Tetrahedron
91. Andrzej Rajca, Sumit Mukherjee, Maren Pink, Suchada Rajca, Kausik Das, “1,3-Alternate Calix[4]arene Nitronyl Nitroxide Tetraradical and Diradical: Synthesis, X-ray Crystallography, Paramagnetic NMR Spectroscopy, EPR Spectroscopy, and Magnetic Studies” Tetrahedron (Symp.-in-Print, New Trends in Calixarene Chemistry), 2007, 63, 10731 - 10742. DOI: 10.1016/j.tet.2007.07.051 [Download]
JACS
90. Andrzej Rajca, Masahiro Takahashi, Maren Pink, Gaëlle Spagnol, Suchada Rajca, “Conformationally-Constrained, Stable, Triplet Ground State (S = 1) Nitroxide Diradicals. Antiferromagnetic Chains of S = 1 Diradicals”, J. Am. Chem. Soc., 2007, 129, 10159 - 10170. DOI: 10.1021/ja0712017
SynLett
89. Andrzej Rajca, Suchada Rajca, Maren Pink, Makoto Miyasaka “Annelated, Chiral π-Conjugated Systems: Tetraphenylenes and Helical β-Oligothiophenes”, SynLett, 2007,1799 - 1822 (account, invited) DOI: 10.1055/s-2007-984538
JACS
88 Andrzej Rajca, Kouichi Shiraishi, Maren Pink, Suchada Rajca, “Triplet (S = 1) Ground State Aminyl Diradical” J. Am. Chem. Soc., 2007, 129, 7232 - 7233. DOI:10.1021/ja071881d
JOC
87. Gaëlle Spagnol, Andrzej Rajca, Suchada Rajca, “Efficient Synthesis of Tricyclic Benzobisoxazines by Silica Gel Catalysis”, J. Org. Chem., 2007, 72, 1867 - 1869. DOI:10.1021/jo062670e
JPCC
86. Reyes Malavé Osuna, Rocío Ponce Ortiz, Víctor Hernández, Juan Teodomiro López Navarrete, Makoto Miyasaka, Suchada Rajca, Andrzej Rajca, Rainer Glaser, “Helically Annelated and Cross-Conjugated β-Oligothiophenes: An FT-Raman Spectroscopic and Quantum Chemical DFT Study”, J. Phys. Chem. C., 2007, 111, 4854 - 4860. DOI:10.1021/jp0677344. [animation]
wiley book
85. Andrzej Rajca, Makoto Miyasaka, “Synthesis and Characterization of Novel Chiral Conjugated Materials”, In Functional Organic Materials – Syntheses and Strategies, T. J. J. Mueller, U. H. F. Bunz, Eds.; Wiley-VCH, 2007, Chapter 15, 5435–77 [Download]
JACS
84. Andrzej Rajca, Sumit Mukherjee, Maren Pink, Suchada Rajca, “Exchange Coupling Mediated Through-Bonds and Through-Space in Conformationally-Constrained Polyradical Scaffolds: Calix[4]arene Nitroxide Tetraradicals and Diradical“, J. Am. Chem. Soc., 2006, 128, 13497–13507. DOI:10.1021/ja063567+ . [PubMed]
JACS
83. Kausik Das, Maren Pink, Suchada Rajca, Andrzej Rajca, “Synthesis and Structure of Nucleoside with π-Conjugated Nitroxide Spin Label Forming a One-Dimensional Ferromagnetic Chain”, J. Am. Chem. Soc., 2006, 128, 5334-5335. DOI:10.1021/ja060846o
JOC
82. Makoto Miyasaka, Andrzej Rajca, “Synthesis of Dithieno[2,3-b:3′,2′-d]thiophenes-Building Blocks for Cross-Conjugated β-Oligothiophenes”, J. Org. Chem., 2006, 71, 3264-3266. DOI:10.1021/jo060038f
JACS
81. Makoto Miyasaka, Andrzej Rajca, Maren Pink, Suchada Rajca, “Cross-Conjugated Oligothiophenes Derived from The (C2S)n Helix: Asymmetric Synthesis and Structure of Carbon-Sulfur [11]Helicene”, J. Am. Chem. Soc., 2005, 127, 13806-13807. DOI:10.1021/ja55414c
ChemComm
80. Gaëlle Spagnol, Kouichi Shiraishi, Suchada Rajca, Andrzej Rajca, “Triplet Ground State (S = 1) Pegylated Bis(aminoxyl) Diradical: Synthesis and the Effect of Water on Magnetic Properties”, Chem. Comm., 2005, 5047-5049. DOI:10.1039/B508094K
JACS
79.Kouichi Shiraishi, Andrzej Rajca, Maren Pink, Suchada Rajca, “π-Conjugated Conjoined Double Helicene via a Sequence of Three Oxidative CC– and NN–Homocouplings”, J. Am. Chem. Soc, 2005, 127, 9312-9313. DOI:10.1021/ja51521v
JACS
78. Andrzej Rajca, Kouichi Shiraishi, Matthew Vale, Hongxian Han, Suchada Rajca, “Stable Hydrocarbon Diradical, an Analogue of Trimethylenemethane”, J. Am. Chem. Soc, 2005, 127, 9014-9020 (Web Release Date: June 1, 2005), DOI:10.1021/ja052002v
Polymer J
77. Eiji Fukuzaki, Naoki Takahashi, Shingo Imai, Hiroyuki Nishide, Andrzej Rajca, “Synthesis of Dendritic, Non-Kekulé-, and Nondisjoint-type Triphenylmethanes Terminated with Galvinoxyl Radicals”, Polymer, J., 2005, 37, 284. DOI:10.1295/polymj.37.284
APOC
76. Andrzej Rajca, “The Physical Organic Chemistry of Very High-Spin Polyradicals”, Adv. Phys. Org. Chem., 2005, 40, 153-199. DOI:10.1016/S0065-3160(05)40004-0
JACS
75. Andrzej Rajca, Makoto Miyasaka, Maren Pink, Hua Wang and Suchada Rajca, “Helically Annelated and Cross-Conjugated Oligothiophenes: Asymmetric Synthesis, Resolution, and Characterization of a Carbon-Sulfur [7]Helicene”, J. Am. Chem. Soc.,2004, 126, 15211-15222. DOI:10.1021/ja0462530
Chem Euro J
74. Makoto Miyasaka, Maren Pink, Andrzej Rajca and Suchada Rajca, “Chiral Molecular Glass: Synthesis and Characterization of Enantiomerically Pure Thiophene-Based [7]Helicene”, Chem. Eur. J., 2004, 10, 6531-6539. DOI:10.1002/chem.200400635
Chem Euro J
73. Andrzej Rajca, Jirawat Wongsriratanakula, Suchada Rajca, Ronald L. Cerny, “Organic Spin Clusters: Annelated Macrocyclic Polyarylmethyl Polyradicals and Polymer with Very High-Spin S = 6 - 18”, Chem. Eur. J. , 2004, 10, 3144-3157. (VIP) DOI: 10.1002/chem.200306036 [Cover Picture]
JACS
72. Andrzej Rajca, Jirawat Wongsriratanakul, Suchada Rajca, “Organic Spin Clusters: Macrocyclic-Macrocyclic Polyarylmethyl Polyradicals with Very High-Spin S = 5 - 13”, J. Am. Chem. Soc., 2004, 126, 6608-6626. DOI:10.1021/ja031549b
JACS
71. Suchada Rajca, Andrzej Rajca, Jirawat Wongsriratanakul, Paul Butler, Sungmin Choi, “Organic Spin Clusters. Dendritic-Macrocyclic Polyarylmethyl Polyradical with Very High-Spin of S = 10 and its Derivatives: Synthesis, Magnetic Studies, and Small Angle Neutron Scattering”, J. Am. Chem. Soc., 2004, 126, 6972-6986. DOI:10.1021/ja031548j
ENN
70. Andrzej Rajca, “Organic Polyradical: Magnetic Nanoclusters”, in Encyclopedia of Nanoscience and Nanotechnology, H. S. Nalwa Ed., American Scientific Publishers, 2004, vol. 8 (Ne-P), 285-294.
SynLett
69. Makoto Miyasaka and Andrzej Rajca, “Synthesis of a Short Carbon-Sulfur Helicene: Pd-Catalyzed Cross-Coupling at the β-Positions of Thiophenes”, Synlett (Cluster Issue, invited) 2004.177-182. DOI:10.1055/s-2003-43335
JACS
68. Andrzej Rajca, Maren Pink, Teerapat Rojsajjakul, Kan Lu, Hua Wang, and Suchada Rajca, “X-ray Crystallography and Magnetic Studies of a Stable Macrocyclic Tetranitroxide. Intramolecular Dimer of Nitroxides in a Constrained Geometry of the Upper Rim of Calix[4]arene”, J. Am. Chem. Soc., 2003, 125, 8534-8538. DOI:10.1021/ja034115p
JPCA
67. T.B. Friedman, X. Cao, A. Rajca, H. Wang L.A. Nafie, “Determination of Absolute Configuration in Molecules with hiral Axes by Vibrational Circular Dichroism: A C2-Symmetric Annelated Heptathiophene and a D2-Symmetric Dimer of 1,1’-Binapthyl”, J. Phys. Chem. A, 2003, 107, 7692-7696. DOI:10.1021/jp030307v
EPoly
66. Andrzej Rajca, “Magnetic Polymers”, in Encyclopedia of Polymer Science and Technology, 3 rd Ed, (J. I. Kroschwitz, Ed) Wiley, 2003, 6, 721 - 735 (Online Posing Date: October 15, 2002) DOI:10.1002/0471440264.pst433
Chem Euro J
65. Andrzej Rajca, “From High-Spin Organic Molecules to Organic Polymers with Magnetic Ordering”, Chem. Eur. J., 2002, 8, 4834-4841 (Concept Article, invited). DOI:10.1002/1521-3765(20021104)8:21<4834::AID-CHEM4834>3.0.CO;2-E
JACS
64. Roy Shenhar, Hua Wang, Roy E. Hoffman, Limor Frish, Liat Avram, Itamar Willner, Andrzej Rajca, and Mordecai Rabinovitz, “Self-Assembled, Helically Stacked Anionic Aggregates of 2,5,8,11-Tetra-tert-butylcycloocta[1,2,3,4-def;5,6,7,8-d′e′f′] bisbiphenylene, Stabilized by Electrostatic Interactions”, J. Am. Chem. Soc., 2002, 124, 4685-4692. DOI: 10.1021/ja012140u
JPCA
63. Roy Shenhar, Itamar Willner, Andrzej Rajca, Mordecai Rabinovitz, “Photoejection of Electrons from Cycloocta[1,2,3,4-def;5,6,7,8-d′e′f′]Bisbiphenylene Radical-Anion and Dianion Derivatives: Identification of a Light-Induced Disproportionation”, J. Phys. Chem. A, 2002, 106, 6206-6212. DOI:10.1021/jp014330x
CRC Hyper-structureed Molecule
62. A. Rajca, “Organic Spin Clusters, Fractals, and Networks with Very High-Spin”, in Hyper-structured Molecules III, H. Sasabe, Ed., Taylor & Francis, London, 2002, Chapter 3, 46-60.
Science
61. A. Rajca, J. Wongsriratanakul, S. Rajca, " Magnetic Ordering in an Organic Polymer", Science, 2001, 294, 1503.  [Introduction to the Magnetism and Materials special issue by I. S. Osborn, "The Attraction of Magnetism"
Tetrahedron
60. A. Rajca, H. Wang, P. Bolshov, S. Rajca, “Greek Cross Dodecaphenylene: Sparteine-Mediated Asymmetric Synthesis of Chiral D2-Symmetric π-Conjugated Tetra-o-phenylenes”, Tetrahedron, 2001, 57, 3725-3735 DOI:10.1016/S0040-4020(01)00241-1 [Download]
Polymer News
59. A. Rajca, “Very High-Spin Organic Polymers”, Polymer News, 2001, 26, 43-47 (Feature Article).
ChemComm
58. A. Rajca, H. Wang, V. Pawitranon, T. J. Brett, J. J. Stezowski, “Synthesis and Structure of Tetrathiophene with a Chiral 1,1′-Binaphthyl Kink”, Chem. Commun., 2001, 1060-061. DOI:10.1039/b007355p
Polyhedron
57. A. Rajca, S. Rajca, J. Wongsriratanakul, C. R. Ross, II, “4,6-Bis-(trifluoromethyl)-N, N′:-di-tert-butyl-1,3-phenylenebis(aminoxyl) and its Bis(trifluoroacetylacetonato)manganese(II) Complex: Synthesis, X-ray Crystallography, and Magnetism”, Polyhedron, 2001, 20, 1669-675. DOI:10.1016/S0277-5387(01)00671-4
J. Solid State Chem
56. S. Rajca, A. Rajca, “Polyarylmethyl Polyradicals as Organic Spin Clusters”, J. Solid State Chem., 2001, 159, 460-465. DOI:10.1006/jssc.2001.9179
AngewChem
55. A. Rajca, H. Wang, M. Pink, S. Rajca, “Annelated Heptathiophene: a Fragment of a Carbon-Sulfur Helix”, Angew. Chem. Int. Ed., 2000, 39, 4481. DOI:10.1002/1521-3773(20001215)39:24<4481::AID-ANIE4481>3.0.CO;2-G
JACS
54.A. Rajca, A. Safronov, S. Rajca, J. Wongsriratanakul “D2-Symmetric Dimer of 1,1′-Binaphthyl and Its Chiral π-Conjugated Carbodianion”, J. Am. Chem. Soc., 2000, 122, 3351-3357. DOI:10.1021/ja993286k
Magn.Reson. Chem.
53.R. E. Hoffman, R. Shenhar, I. Willner, H. E. Bronstein, L. Scott, A. Rajca, M. Rabinovitz, “Heteronuclear editing method for detecting NOE between chemically equivalent protrons: application to polycyclic aromatic hydrocarbons”, Magn. Reson. Chem. 2000, 38, 311-314. DOI:10.1002/%28SICI%291097-458X%28200004%2938%3A4%3C311%3A%3AAID-MRC641%3E3.3.CO%3B2-L
ChemComm
52.A. Rajca, S. Rajca, J. Wongsriratanakul, “Singlet-Triplet Energy Gap in a Cyclophane-Based Diradical with Parallel Exchange Coupling Pathways”, Chem. Commun., 2000, 1021-1022. DOI:10.1039/b001273o
  • 51. A. Rajca, S. Rajca, J. Wongsriratanakul, “Very High-Spin Organic Polymer: π-Conjugated Hydrocarbon Network with Average Spin of S ≥ 40”, J. Am. Chem. Soc., 1999, 121, 6308. DOI:10.1021/ja990881d
  • 50. A. Rajca, K. Lu, S. Rajca, C. Ross, II, “Singlet-triplet bistability in a 1,3-phenylene-based bis(aminoxyl) diradical”, Chem. Commun, 1999, 1249. DOI:10.1039/a901906e
  • 49. A. Rajca, S. Rajca, J. Wongsriratanakul, “Hydrocarbon Polymer Network with Very High-Spin Ground State, S = 15 - 48”, Polym. Prepr. ACS, PMSE, 1999, 189.
  • 48. A. Rajca, “High-Spin Organic Polyradicals”, in Magnetic Properties of Organic Materials, P. Lathti, Ed.; Marcel Dekker, 1999, Chapter 17.
  • 47. A. Rajca, J. Wongsriratanakul, S. Rajca, R. Cerny, “Dendritic-Macrocyclic Very-High-Spin Organic Polyradical with S = 10”, Angew. Chem. Int. Ed., 1998, 37, 1229. [Abstract]
  • 46. A. Rajca, S. Rajca, “Alkyl-Substituted Schlenk Hydrocarbon Diradicals with Triplet and Singlet Ground States in Frozen Solutions”, J. Chem. Soc. Perkin 2, 1998, 1077. DOI:10.1039/a706374a
  • 45. A. Rajca, A. Safronov, S. Rajca, R. Schoemaker, “Double Helical Octaphenylene”, Angew. Chem. Int. Ed., 1997, 36, 488. DOI:10.1002/anie.199704881
  • 44. A. Rajca, S. Rajca, S. R. Desai, V. W. Day, “Peroxides of Sterically Hindered Derivatives of Schlenk Hydrocarbon Diradical”, J. Org. Chem., 1997, 62, 6524. DOI:10.1021/jo961879x
  • 43. A. Rajca, “Assembling Triarylmethyls into Mesoscopic-Size Polyradicals: How to Maintain Strong Interactions Between Multiple Sites in a Single Molecule?”, in Modular Chemistry, J. Michl, Ed., Kluwer, 1997, p. 193.
  • 42. A. Rajca, “High-Spin Organic Polyradicals as Simple Spin Clusters”, Proceedings from the International Conference on Molecule-Based Magnets, Aug. 1996, Osaka, Japan; Liq. Cryst. Mol. Cryst., 1997, 305, 567.
  • 41. A. Rajca, K. Lu, S. Rajca, “High-Spin Polyarylmethyl Polyradical: Fragment of a Macrocyclic Double-Strand”, J. Am. Chem. Soc., 1997, 119, 10335. DOI:10.1021/ja971493j
  • 40. A. Rajca, J. Wongsriratanakul, S. Rajca, “High-Spin Organic Polyradicals as Spin Clusters: Ferromagnetic Spin Coupling through Biphenyl Unit in Polyarylmethyl Tri-, Penta-, Hepta-, and Hexadecaradicals”, J. Am. Chem. Soc., 1997, 119, 11674. DOI:10.1021/ja972378b
  • 39. A. Rajca, “High-Spin Organic Polyradicals”, Polymer News, 1996, 21, 405 (Feature Article).
  • 38. S. Rajca, S. and A. Rajca, “Dendritic Polyradicals” in Polymeric Materials Encyclopedia, J.C. Salamone, Ed., CRC Press: Boca Raton, FL, 1996, vol. 3 (D - E), 830.
  • 37. A. Rajca, A. Safronov, S. Rajca, C. R. Ross, J. J. Stezowski, “Biphenylene Dimer. Molecular Fragment of a Two-Dimensional Carbon Net and Double-Stranded Polymer”, J. Am. Chem. Soc., 1996, 118, 7272. DOI:10.1021/ja961065y
  • 36. A. Rajca, and S. Rajca, “Intramolecular Antiferromagnetic vs Ferromagnetic Spin Coupling Through the Biphenyl Unit”, J. Am. Chem. Soc., 1996, 118, 8121. DOI:10.1021/ja961045w
  • 35. A. Rajca, “Very-High-Spin Polyradicals”, a chapter in ACS Symposium Series 644, Molecule-Based Magnetic Materials, M. M. Turnbull, T. Sugimoto, L. K. Thompson, Eds.; ACS, Washington, 1996, Chapter 17.
  • 34. A. Rajca, S. Rajca, S. R. Desai, “Macrocyclic π-Conjugated Carbopolyanions and Polyradicals Based upon Calix[4]arene and Calix[3]arene Rings”, J. Am. Chem. Soc., 1995, 117, 806. DOI:10.1021/ja00107a025
  • 33. S. Rajca, A. Rajca, “Novel High-Spin Molecules: π-Conjugated Polyradical Polyanions. Ferromagnetic Spin Coupling and Electron Localization”, J.Am. Chem. Soc., 1995, 117, 9172. DOI:10.1021/ja00141a008
  • 32. A. Rajca, S. Rajca, S. R. Desai, “Boron-centred Diradical Dianion: a New Triplet State Molecule”, J. Chem. Soc.,Chem. Commun., 1995, 1957. DOI:10.1039/C39950001957
  • 31. A. Rajca, “Organic Di-and Polyradicals. From Spin Coupling to Magnetism?”, Chem. Rev., 1994, 94, 871. DOI:10.1021/cr00028a002
  • 30. A. Rajca, “Toward Organic Synthesis of a Nanometer-Size Magnetic Particle”, Adv. Mater., 1994, 6, 605 (Research News). DOI:10.1002/adma.19940060720
  • 29. A. Rajca, S. Rajca, R. Padmakumar, “Calixarene-BasedMacrocyclic Nonet (S = 4) Octaradical and Its Acyclic Sextet (S = 5/2) Pentaradical Analogue”, Angew. Chem. Int. Ed., 1994,33, 2091. DOI:10.1002/anie.199420911
  • 28. A. Rajca*, S. Janicki, “Synthesis of Sterically Hindered 1,3-Connected Polyarylmethanes”, J. Org. Chem., 1994, 59, 7099. DOI:10.1021/jo00102a041
  • 27. A. Rajca, R. Padmakumar, D. J. Smithhisler, S. R. Desai, C. R. Ross, J. J. Stezowski, “Synthesis of [1.1.1.1]Metacyclophane Macrocycle”, J. Org. Chem., 1994, 59, 7701. DOI:10.1021/jo00104a027
  • 26. A. Rajca, “High Spin Polyarylmethyl Polyradicals”, in Advances in Dendritic Macromolecules, G. R Newkome, Ed.; JAI Press: Greenwich, 1994, 1, 133.
  • 25. A. Rajca, S. Utamapanya, “Polyarylmethyl Quartet Triradicals and Quintet Tetraradicals”, J. Am. Chem. Soc., 1993, 115, 2396. DOI:10.1021/ja00059a039
  • 24. A. Rajca, S. Utamapanya, “Spin Balls and Spin Barbells: Preparation and Magnetic Studies of S = 7/2 Dendritic Heptaradical and Progress Toward Very High Spin Dendrimers”, Liq. Cryst. Mol. Cryst., 1993, 232, 305. DOI:10.1080/10587259308035720
  • 23. S. Utamapanya, H. Kakegawa, L. Bryant, A. Rajca, “High-Spin Polymers Synthesis of 1,3-Connected Polyarylmethane and its Carbopolyanion and Polyradical”, Chem. Mater., 1993, 5, 1053. DOI:10.1021/cm00032a00
  • 22. A. Rajca, S. Utamapanya, D. J. Smithhisler, “Near-Degeneracy Between the Low- and High-Spin Ground States in an Alternant Hydrocarbon Diradical: Topology and Geometry”, J. Org. Chem., 1993, 5, 5650. DOI:10.1021/jo00073a024
  • 21. A. Rajca, S. Utamapanya, “Toward Organic Synthesis of a Magnetic Particle: Dendritic Polyradicals with 15 and 31 Centers for Unpaired Electrons”, J. Am. Chem. Soc., 1993, 115, 10688. DOI:10.1021/ja00076a029
  • 20. A. Rajca, S. Utamapanya, S. Thayumanavan, “Polyarylmethyl Octet (S = 7/2) Heptaradical and Undecet (S = 5) Decaradical”, J. Am. Chem. Soc., 1992, 114, 1884. DOI:10.1021/ja00031a055
  • 19. A. Rajca, S. Utamapanya, “π-Conjugated Systems with Unique Electronic Structure: A Case of “Planarized” 1,3-Connected Polyarylmethyl carbodianion and Stable Triplet Hydrocarbon Diradical”, J. Org. Chem., 1992, 57, 1760. DOI:10.1021/jo00032a030
  • 18. A. Rajca, “Synthesis of 1,3-Connected Polyarylmethanes”, J. Org. Chem., 1991, 56, 2557. DOI:10.1021/jo00007a054
  • 17. A. Rajca, S. Utamapanya, J. Xu, “Control of Magnetic Interactions in Polyarylmethyl Triplet Diradicals Using Steric Hindrance”, J. Am. Chem. Soc., 1991, 113, 9235. DOI:10.1021/ja00024a032
  • 16. S. Utamapanya, A. Rajca, “Topological Control of Electron Localization in π-Conjugated Polyarylmethyl Carbopolyanions and Radical Anions”, J. Am. Chem. Soc., 1991, 113, 9242. DOI:10.1021/ja00024a033
  • 15. A. Rajca, “A Polyarylmethyl Carbotetraanion”, J. Am. Chem. Soc., 1990, 112, 5889. DOI:10.1021/ja00171a044
  • 14. A. Rajca, “A Polyarylmethyl Quintet Tetraradical”, J. Am. Chem. Soc., 1990, 112, 5890. DOI:10.1021/ja00171a045
  • 13. A. Rajca, P. Wang, A. Streitwieser, Jr., P. v. R. Schleyer, “Dilithiosilanes and Disodiosilanes. Ionicity of the Silicon-Metal Bond”, Inorg. Chem., 1989, 28, 3064.
  • 12. A. Rajca, K. H. Lee, “Ab Initio Study of Destabilized π-Conjugated Systems with Large π-Overlap: Sulfur Trimethylene and Chlorine Trimethylene Cation. Electrostatics as a Dominant Factor in Multiple Bonding for Second Row Elements”, J. Am. Chem. Soc., 1989, 111, 4166.
  • 11. A. Rajca, A. Streitwieser, Jr., “Ab Initio Study of 2-Silallyl Cation and Anion. Some Attributes of Si-Containing π-Conjugated Systems”, Organometallics, 1988, 7, 2215.
  • 10. A. Rajca, L. M. Tolbert, “π-Conjugated Dianions. A 13C NMR Study”, J. Am. Chem. Soc., 1988, 110, 871.
  • 9. A. Rajca and L. M. Tolbert, “How Does an Allene Distort to Accommodate Negative Charge. The 1,1,3,3-Tetraphenylallene System”, J. Am. Chem. Soc., 1987, 109, 1782.
  • 8. A. Rajca, A. Streitwieser, Jr., and L. M. Tolbert, “Ab Initio Study of 2,3-Dilithiopropene”, J. Am. Chem. Soc., 1987, 109, 1790.
  • 7. A. Streitwieser, Jr., A. Rajca, R. S. McDowell, R. Glaser, “Semipolar P-O and P-C Bonds. Theoretical Study of Hypophosphite and Related Methylenephosphoranes”, J. Am. Chem. Soc., 1987, 109, 4184.
  • 6. A. Rajca, J. Rice, A. Streitwieser, Jr., H. F. Schaefer III, “Methaphosphate and Trismethylenemethaphosphate (P(CH2)3-) Anions. Do They Have Three Double Bonds to Phosphorus?” J. Am. Chem. Soc., 1987, 109, 4189.
  • 5. A. Rajca, D. Grobelny, S. Witek, “Cleavage of 1,3-Oxathiol-2-one Ring with n-Butyllithium. New Route to Alkynyl Thiolates”, Monatshefte Chem., 1985, 116, 1363.
  • 4. A. Rajca and L. M. Tolbert, “Tris(diphenylmethylene)methane Dianion. Direct Evidence for π-Aromaticity”, J. Am. Chem. Soc., 1985, 107, 698.
  • 3. A. Rajca and L. M. Tolbert, “Structure of Dilithium Tetraphenylallenide”, J. Am. Chem. Soc., 1985, 107, 2969.
  • 2. L. M. Tolbert and A. Rajca, “6,6-Dimethyl-2,4-diphenylcyclohexadienyl Anion and the Failure of Carbanion Homoaromaticity”, J. Org. Chem., 1985, 50, 4805.
  • 1. A. Rajca, D. Grobelny, S. Witek, M. Zbirovsky, “5-Aryl-2-oxo-1,2,4-oxathiazolones as Cyclocarbonylating Agent for 2-Aminoalcohols and 1,2-Diamines”, Synthesis, 1983, 103.
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