Andrzej Rajca - Publications

Affiliations: 
Chemistry The University of Nebraska - Lincoln, Lincoln, NE 
Area:
Organic Chemistry

59 high-probability publications. We are testing a new system for linking publications to authors. You can help! If you notice any inaccuracies, please sign in and mark papers as correct or incorrect matches. If you identify any major omissions or other inaccuracies in the publication list, please let us know.

Year Citation  Score
2019 Bleicken S, Assafa TE, Zhang H, Elsner C, Ritsch I, Pink M, Rajca S, Jeschke G, Rajca A, Bordignon E. -Diethyl Pyrroline Nitroxide Spin Labels: Synthesis, EPR Characterization, Rotamer Libraries and Biocompatibility. Chemistryopen. 8: 1035. PMID 31406651 DOI: 10.1002/open.201900232  0.48
2019 Gallagher N, Zhang H, Junghoefer T, Giangrisostomi E, Ovsyannikov R, Pink M, Rajca S, Casu MB, Rajca A. Thermally and Magnetically Robust Triplet Ground State Diradical. Journal of the American Chemical Society. PMID 30816035 DOI: 10.1021/jacs.9b00558  0.48
2018 Leavesley A, Jain S, Kamniker I, Zhang H, Rajca S, Rajca A, Han S. Maximizing NMR signal per unit time by facilitating the e-e-n cross effect DNP rate. Physical Chemistry Chemical Physics : Pccp. PMID 30375593 DOI: 10.1039/c8cp04909b  0.48
2018 Wang W, Chen C, Shu C, Rajca S, Wang X, Rajca A. S = 1 Tetraazacyclophane Diradical Dication with Robust Stability: a Case of Low Temperature One-Dimensional Antiferromagnetic Chain. Journal of the American Chemical Society. PMID 29863339 DOI: 10.1021/jacs.8b02415  0.48
2018 Equbal A, Li Y, Leavesley A, Huang S, Rajca S, Rajca A, Han S. Truncated Cross Effect Dynamic Nuclear Polarization: An Overhauser Effect Doppelgänger. The Journal of Physical Chemistry Letters. 2175-2180. PMID 29630375 DOI: 10.1021/acs.jpclett.8b00751  0.48
2018 Huang S, Zhang H, Paletta JT, Rajca S, Rajca A. Reduction kinetics and electrochemistry of tetracarboxylate nitroxides. Free Radical Research. 1-141. PMID 29402129 DOI: 10.1080/10715762.2018.1437268  0.48
2017 Wang Y, Rajca S, Rajca A. PEGylated, Water Soluble, Stable Aminyl Radical. The Journal of Organic Chemistry. PMID 28654284 DOI: 10.1021/acs.joc.7b01212  0.48
2017 Wang Y, Olankitwanit A, Rajca S, Rajca A. Intramolecular Hydrogen Atom Transfer in Aminyl Radical at Room Temperature with Large Kinetic Isotope Effect. Journal of the American Chemical Society. PMID 28514849 DOI: 10.1021/jacs.7b02692  0.48
2016 Huang S, Paletta JT, Elajaili H, Huber K, Pink M, Rajca S, Eaton GR, Eaton SS, Rajca A. Synthesis and Electron Spin Relaxation of Tetra-Carboxylate Pyrroline Nitroxides. The Journal of Organic Chemistry. PMID 28032758 DOI: 10.1021/acs.joc.6b02737  0.48
2016 Zhang S, Liu X, Li C, Li L, Song J, Shi J, Morton MD, Rajca S, Rajca A, Wang H. Thiophene-based Double Helices: Syntheses, X-ray Structures and Chiroptical Properties. Journal of the American Chemical Society. PMID 27440376 DOI: 10.1021/jacs.6b05709  0.48
2016 Gallagher NM, Bauer JJ, Pink M, Rajca S, Rajca A. High Spin Organic Diradical with Robust Stability. Journal of the American Chemical Society. PMID 27430499 DOI: 10.1021/jacs.6b05080  0.44
2016 Wang Y, Zhang H, Pink M, Olankitwanit A, Rajca S, Rajca A. Radical Cation and Neutral Radical of Aza-Thia[7]helicene with SOMO-HOMO Energy Level Inversion. Journal of the American Chemical Society. PMID 27219299 DOI: 10.1021/jacs.6b01498  0.48
2015 Olankitwanit A, Rajca S, Rajca A. Aza-m-Xylylene Diradical with Increased Steric Protection of the Aminyl Radicals. The Journal of Organic Chemistry. 80: 5035-44. PMID 25901647 DOI: 10.1021/acs.joc.5b00421  0.48
2015 Meyer V, Swanson MA, Clouston LJ, Boraty?ski PJ, Stein RA, Mchaourab HS, Rajca A, Eaton SS, Eaton GR. Room-temperature distance measurements of immobilized spin-labeled protein by DEER/PELDOR. Biophysical Journal. 108: 1213-9. PMID 25762332 DOI: 10.1016/j.bpj.2015.01.015  0.44
2014 Sowers MA, McCombs JR, Wang Y, Paletta JT, Morton SW, Dreaden EC, Boska MD, Ottaviani MF, Hammond PT, Rajca A, Johnson JA. Redox-responsive branched-bottlebrush polymers for in vivo MRI and fluorescence imaging. Nature Communications. 5: 5460. PMID 25403521 DOI: 10.1038/ncomms6460  0.44
2014 Wang Y, Paletta JT, Berg K, Reinhart E, Rajca S, Rajca A. Synthesis of unnatural amino acids functionalized with sterically shielded pyrroline nitroxides. Organic Letters. 16: 5298-300. PMID 25324010 DOI: 10.1021/ol502449r  0.44
2014 Yu Z, Quine RW, Rinard GA, Tseitlin M, Elajaili H, Kathirvelu V, Clouston LJ, Boraty?ski PJ, Rajca A, Stein R, Mchaourab H, Eaton SS, Eaton GR. Rapid-scan EPR of immobilized nitroxides. Journal of Magnetic Resonance (San Diego, Calif. : 1997). 247: 67-71. PMID 25240151 DOI: 10.1016/j.jmr.2014.08.008  0.44
2014 Olankitwanit A, Pink M, Rajca S, Rajca A. Synthesis of aza-m-xylylene diradicals with large singlet-triplet energy gap and statistical analyses of their EPR spectra. Journal of the American Chemical Society. 136: 14277-88. PMID 25216763 DOI: 10.1021/ja508119d  0.48
2014 Rajca A, Wang Y, Boska M, Paletta JT, Olankitwanit A, Swanson MA, Mitchell DG, Eaton SS, Eaton GR, Rajca S. Correction to organic radical contrast agents for magnetic resonance imaging. Journal of the American Chemical Society. 136: 3318. PMID 24533533 DOI: 10.1021/ja413028d  0.48
2013 Rajca A, Olankitwanit A, Wang Y, Boratyński PJ, Pink M, Rajca S. High-spin S = 2 ground state aminyl tetraradicals. Journal of the American Chemical Society. 135: 18205-15. PMID 24251582 DOI: 10.1021/ja409472f  0.48
2012 Paletta JT, Pink M, Foley B, Rajca S, Rajca A. Synthesis and reduction kinetics of sterically shielded pyrrolidine nitroxides. Organic Letters. 14: 5322-5. PMID 23050653 DOI: 10.1021/ol302506f  0.48
2012 Rajca A, Wang Y, Boska M, Paletta JT, Olankitwanit A, Swanson MA, Mitchell DG, Eaton SS, Eaton GR, Rajca S. Organic radical contrast agents for magnetic resonance imaging. Journal of the American Chemical Society. 134: 15724-7. PMID 22974177 DOI: 10.1021/ja3079829  0.44
2012 Miyasaka M, Pink M, Olankitwanit A, Rajca S, Rajca A. Band gap of carbon-sulfur [N]helicenes. Organic Letters. 14: 3076-9. PMID 22651843 DOI: 10.1021/ol3011437  0.48
2012 Rajca A, Boratyński PJ, Olankitwanit A, Shiraishi K, Pink M, Rajca S. Ladder oligo(m-aniline)s: derivatives of azaacenes with cross-conjugated π-systems. The Journal of Organic Chemistry. 77: 2107-20. PMID 22329511 DOI: 10.1021/jo2025948  0.48
2011 Rajca A, Shiraishi K, Boratyński PJ, Pink M, Miyasaka M, Rajca S. Oxidation of annelated diarylamines: analysis of reaction pathways to nitroxide diradical and spirocyclic products. The Journal of Organic Chemistry. 76: 8447-57. PMID 21894931 DOI: 10.1021/jo2017923  0.48
2011 Olankitwanit A, Kathirvelu V, Rajca S, Eaton GR, Eaton SS, Rajca A. Calix[4]arene nitroxide tetraradical and octaradical. Chemical Communications (Cambridge, England). 47: 6443-5. PMID 21541435 DOI: 10.1039/c1cc11172h  0.44
2011 Rajca A, Olankitwanit A, Rajca S. Triplet ground state derivative of aza-m-xylylene diradical with large singlet-triplet energy gap. Journal of the American Chemical Society. 133: 4750-3. PMID 21401132 DOI: 10.1021/ja200708b  0.48
2010 Boratyński PJ, Pink M, Rajca S, Rajca A. Isolation of the triplet ground state aminyl diradical. Angewandte Chemie (International Ed. in English). 49: 5459-62. PMID 20602401 DOI: 10.1002/anie.201002811  0.48
2010 Miyasaka M, Pink M, Rajca S, Rajca A. Spiro oligothiophenes. Organic Letters. 12: 3230-3. PMID 20550149 DOI: 10.1021/ol1011696  0.48
2010 Rajca A, Kathirvelu V, Roy SK, Pink M, Rajca S, Sarkar S, Eaton SS, Eaton GR. A spirocyclohexyl nitroxide amino acid spin label for pulsed EPR spectroscopy distance measurements. Chemistry (Weinheim An Der Bergstrasse, Germany). 16: 5778-82. PMID 20391558 DOI: 10.1002/chem.200903102  0.44
2010 Zak JK, Miyasaka M, Rajca S, Lapkowski M, Rajca A. Radical cation of helical, cross-conjugated beta-oligothiophene. Journal of the American Chemical Society. 132: 3246-7. PMID 20170121 DOI: 10.1021/ja910076n  0.48
2010 Rajca A, Rajca S. Asymmetric synthesis of chiral tetraphenylenes. Angewandte Chemie (International Ed. in English). 49: 672-4. PMID 20029863 DOI: 10.1002/anie.200905421  0.48
2009 Rajca A, Miyasaka M, Xiao S, Boratyński PJ, Pink M, Rajca S. Intramolecular cyclization of thiophene-based [7]helicenes to quasi-[8]circulenes. The Journal of Organic Chemistry. 74: 9105-11. PMID 19886651 DOI: 10.1021/jo902030u  0.48
2009 Rajca A, Pink M, Xiao S, Miyasaka M, Rajca S, Das K, Plessel K. Functionalized thiophene-based [7]helicene: chirooptical properties versus electron delocalization. The Journal of Organic Chemistry. 74: 7504-13. PMID 19739665 DOI: 10.1021/jo901769c  0.44
2009 Rajca A, Shiraishi K, Rajca S. Stable diarylnitroxide diradical with triplet ground state. Chemical Communications (Cambridge, England). 4372-4. PMID 19597596 DOI: 10.1039/b909741d  0.48
2009 Miyasaka M, Pink M, Rajca S, Rajca A. Noncovalent interactions in the asymmetric synthesis of rigid, conjugated helical structures. Angewandte Chemie (International Ed. in English). 48: 5954-7. PMID 19569149 DOI: 10.1002/anie.200901349  0.48
2008 Rajca A, Vale M, Rajca S. Diarylnitroxide diradicals: low-temperature oxidation of diarylamines to nitroxides. Journal of the American Chemical Society. 130: 9099-105. PMID 18576627 DOI: 10.1021/ja8016335  0.48
2008 Sato H, Kathirvelu V, Spagnol G, Rajca S, Rajca A, Eaton SS, Eaton GR. Impact of electron-electron spin interaction on electron spin relaxation of nitroxide diradicals and tetraradical in glassy solvents between 10 and 300 k. The Journal of Physical Chemistry. B. 112: 2818-28. PMID 18284225 DOI: 10.1021/jp073600u  0.44
2008 Vale M, Pink M, Rajca S, Rajca A. Synthesis, structure, and conformation of aza[1n]metacyclophanes. The Journal of Organic Chemistry. 73: 27-35. PMID 18052391 DOI: 10.1021/jo702151n  0.48
2007 Rajca A, Pink M, Mukherjee S, Rajca S, Das K. 1,3-Alternate calix[4]arene nitronyl nitroxide tetraradical and diradical: synthesis, X-ray crystallography, paramagnetic NMR spectroscopy, EPR spectroscopy, and magnetic studies. Tetrahedron. 63: 10731-10742. PMID 19568320 DOI: 10.1016/j.tet.2007.07.051  0.48
2007 Rajca A, Takahashi M, Pink M, Spagnol G, Rajca S. Conformationally constrained, stable, triplet ground state (S = 1) nitroxide diradicals. Antiferromagnetic chains of S = 1 diradicals. Journal of the American Chemical Society. 129: 10159-70. PMID 17655296 DOI: 10.1021/ja0712017  0.48
2007 Rajca A, Shiraishi K, Pink M, Rajca S. Triplet (S=1) ground state aminyl diradical. Journal of the American Chemical Society. 129: 7232-3. PMID 17506564 DOI: 10.1021/ja071881d  0.48
2007 Spagnol G, Rajca A, Rajca S. Efficient synthesis of tricyclic benzobisoxazines by silica gel catalysis. The Journal of Organic Chemistry. 72: 1867-9. PMID 17266379 DOI: 10.1021/jo062670e  0.48
2006 Rajca A, Mukherjee S, Pink M, Rajca S. Exchange coupling mediated through-bonds and through-space in conformationally constrained polyradical scaffolds: calix[4]arene nitroxide tetraradicals and diradical. Journal of the American Chemical Society. 128: 13497-507. PMID 17031963 DOI: 10.1021/ja063567+  0.48
2006 Das K, Pink M, Rajca S, Rajca A. Synthesis and structure of a nucleoside with pi-conjugated nitroxide spin label forming a one-dimensional ferromagnetic chain. Journal of the American Chemical Society. 128: 5334-5. PMID 16620092 DOI: 10.1021/ja060846o  0.48
2006 Miyasaka M, Rajca A. Synthesis of dithieno[2,3-b:3',2'-d]thiophenes-building blocks for cross-conjugated beta-oligothiophenes. The Journal of Organic Chemistry. 71: 3264-6. PMID 16599625 DOI: 10.1021/jo060038f  0.44
2005 Spagnol G, Shiraishi K, Rajca S, Rajca A. Triplet ground state (S= 1) pegylated bis(aminoxyl) diradical: synthesis and the effect of water on magnetic properties. Chemical Communications (Cambridge, England). 5047-9. PMID 16220166 DOI: 10.1039/b508094k  0.48
2005 Miyasaka M, Rajca A, Pink M, Rajca S. Cross-conjugated oligothiophenes derived from the (C2S)n helix: asymmetric synthesis and structure of carbon-sulfur [11]helicene. Journal of the American Chemical Society. 127: 13806-7. PMID 16201798 DOI: 10.1021/ja055414c  0.48
2005 Shiraishi K, Rajca A, Pink M, Rajca S. pi-Conjugated conjoined double helicene via a sequence of three oxidative CC- and NN-homocouplings. Journal of the American Chemical Society. 127: 9312-3. PMID 15984826 DOI: 10.1021/ja051521v  0.48
2005 Rajca A, Shiraishi K, Vale M, Han H, Rajca S. Stable hydrocarbon diradical, an analogue of trimethylenemethane. Journal of the American Chemical Society. 127: 9014-20. PMID 15969578 DOI: 10.1021/ja052002v  0.48
2004 Rajca A, Miyasaka M, Pink M, Wang H, Rajca S. Helically annelated and cross-conjugated oligothiophenes: asymmetric synthesis, resolution, and characterization of a carbon-sulfur [7]helicene. Journal of the American Chemical Society. 126: 15211-22. PMID 15548018 DOI: 10.1021/ja0462530  0.48
2004 Miyasaka M, Rajca A, Pink M, Rajca S. Chiral molecular glass: synthesis and characterization of enantiomerically pure thiophene-based [7]helicene. Chemistry (Weinheim An Der Bergstrasse, Germany). 10: 6531-9. PMID 15540263 DOI: 10.1002/chem.200400635  0.48
2004 Rajca A, Wongsriratanakul J, Rajca S, Cerny RL. Organic spin clusters: annelated macrocyclic polyarylmethyl polyradicals and a polymer with very high spin S=6-18. Chemistry (Weinheim An Der Bergstrasse, Germany). 10: 3144-57. PMID 15224323 DOI: 10.1002/chem.200306036  0.48
2004 Rajca S, Rajca A, Wongsriratanakul J, Butler P, Choi SM. Organic spin clusters. A dendritic-macrocyclic poly(arylmethyl) polyradical with very high spin of S = 10 and its derivatives: synthesis, magnetic studies, and small-angle neutron scattering. Journal of the American Chemical Society. 126: 6972-86. PMID 15174867 DOI: 10.1021/ja031548j  0.48
2004 Rajca A, Wongsriratanakul J, Rajca S. Organic spin clusters: macrocyclic-macrocyclic polyarylmethyl polyradicals with very high spin S = 5-13. Journal of the American Chemical Society. 126: 6608-26. PMID 15161289 DOI: 10.1021/ja031549b  0.48
2003 Rajca A, Pink M, Rojsajjakul T, Lu K, Wang H, Rajca S. 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. Journal of the American Chemical Society. 125: 8534-8. PMID 12848560 DOI: 10.1021/ja034115p  0.48
2002 Shenhar R, Wang H, Hoffman RE, Frish L, Avram L, Willner I, Rajca A, Rabinovitz M. 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. Journal of the American Chemical Society. 124: 4685-92. PMID 11971717 DOI: 10.1021/ja012140u  0.44
2000 Rajca A, Wang H, Pink M, Rajca S. Annelated Heptathiophene: A Fragment of a Carbon-Sulfur Helix This research was supported by the National Science Foundation (CHE-9806954). MS analyses were carried out at the Nebraska Center for Mass Spectrometry. Angewandte Chemie (International Ed. in English). 39: 4481-4483. PMID 11169642 DOI: 10.1002/1521-3773(20001215)39:24<4481::AID-ANIE4481>3.0.CO;2-G  0.48
1998 Rajca A, Wongsriratanakul J, Rajca S, Cerny R. A Dendritic Macrocyclic Organic Polyradical with a Very High Spin of S=10. Angewandte Chemie (International Ed. in English). 37: 1229-1232. PMID 29711235 DOI: 10.1002/(SICI)1521-3773(19980518)37:9<1229::AID-ANIE1229>3.0.CO;2-#  0.48
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