Literature DB >> 19568320

1,3-Alternate calix[4]arene nitronyl nitroxide tetraradical and diradical: synthesis, X-ray crystallography, paramagnetic NMR spectroscopy, EPR spectroscopy, and magnetic studies.

Andrzej Rajca1, Maren Pink, Sumit Mukherjee, Suchada Rajca, Kausik Das.   

Abstract

Calix[4]arenes constrained to 1,3-alternate conformation and functionalized at the upper rim with four and two nitronyl nitroxides have been synthesized, and characterized by X-ray crystallography, magnetic resonance (EPR and (1)H NMR) spectroscopy, and magnetic studies. Such calix[4]arene tetraradicals and diradicals provide scaffolds for through-bond and through-space intramolecular exchange couplings.

Entities:  

Year:  2007        PMID： 19568320      PMCID： PMC2702876          DOI： 10.1016/j.tet.2007.07.051

Source DB:  PubMed          Journal:  Tetrahedron        ISSN： 0040-4020            Impact factor:   2.457


  18 in total

1.  Magnetic resonance relaxivity of dendrimer-linked nitroxides.

Authors:  Carl S Winalski; Sonya Shortkroff; Robert V Mulkern; Erika Schneider; Gerald M Rosen
Journal:  Magn Reson Med       Date:  2002-12       Impact factor: 4.668

2.  Spin labeling monitors weak host-guest interactions.

Authors:  Lenz Kröck; Alexander Shivanyuk; David B Goodin; Julius Rebek
Journal:  Chem Commun (Camb)       Date:  2003-12-16       Impact factor: 6.222

3.  Towards a better understanding of the magnetic interactions within m-phenylene alpha-nitronyl imino nitroxide based biradicals.

Authors:  L Catala; J Le Moigne; N Kyritsakas; P Rey; J J Novoa; P Turek
Journal:  Chemistry       Date:  2001-06-01       Impact factor: 5.236

4.  Exchange coupling mediated through-bonds and through-space in conformationally constrained polyradical scaffolds: calix[4]arene nitroxide tetraradicals and diradical.

Authors:  Andrzej Rajca; Sumit Mukherjee; Maren Pink; Suchada Rajca
Journal:  J Am Chem Soc       Date:  2006-10-18       Impact factor: 15.419

5.  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.

Authors:  Andrzej Rajca; Maren Pink; Teerapat Rojsajjakul; Kan Lu; Hua Wang; Suchada Rajca
Journal:  J Am Chem Soc       Date:  2003-07-16       Impact factor: 15.419

6.  Impact of electron-electron spin interaction on electron spin relaxation of nitroxide diradicals and tetraradical in glassy solvents between 10 and 300 k.

Authors:  Hideo Sato; Velavan Kathirvelu; Gaëlle Spagnol; Suchada Rajca; Andrzej Rajca; Sandra S Eaton; Gareth R Eaton
Journal:  J Phys Chem B       Date:  2008-02-20       Impact factor: 2.991

7.  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.

Authors:  Suchada Rajca; Andrzej Rajca; Jirawat Wongsriratanakul; Paul Butler; Sung-min Choi
Journal:  J Am Chem Soc       Date:  2004-06-09       Impact factor: 15.419

8.  In vivo proton electron double resonance imaging of the distribution and clearance of nitroxide radicals in mice.

Authors:  Haihong Li; Guanglong He; Yuanmu Deng; Periannan Kuppusamy; Jay L Zweier
Journal:  Magn Reson Med       Date:  2006-03       Impact factor: 4.668

9.  From high-spin organic molecules to organic polymers with magnetic ordering.

Authors:  Andrzej Rajca
Journal:  Chemistry       Date:  2002-11-04       Impact factor: 5.236

10.  Organic spin clusters: macrocyclic-macrocyclic polyarylmethyl polyradicals with very high spin S = 5-13.

Authors:  Andrzej Rajca; Jirawat Wongsriratanakul; Suchada Rajca
Journal:  J Am Chem Soc       Date:  2004-06-02       Impact factor: 15.419
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  3 in total

1.  Thermally and Magnetically Robust Triplet Ground State Diradical.

Authors:  Nolan Gallagher; Hui Zhang; Tobias Junghoefer; Erika Giangrisostomi; Ruslan Ovsyannikov; Maren Pink; Suchada Rajca; Maria Benedetta Casu; Andrzej Rajca
Journal:  J Am Chem Soc       Date:  2019-03-12       Impact factor: 15.419

2.  Electronic structures and spin topologies of gamma-picoliniumyl radicals. A study of the homolysis of N-methyl-gamma-picolinium and of benzo-, dibenzo-, and naphthoannulated analogs.

Authors:  Rainer Glaser; Yongqiang Sui; Ujjal Sarkar; Kent S Gates
Journal:  J Phys Chem A       Date:  2008-05-29       Impact factor: 2.781

3.  Synthesis and Thin Films of Thermally Robust Quartet (S = 3/2) Ground State Triradical.

Authors:  Chan Shu; Maren Pink; Tobias Junghoefer; Elke Nadler; Suchada Rajca; Maria Benedetta Casu; Andrzej Rajca
Journal:  J Am Chem Soc       Date:  2021-03-31       Impact factor: 15.419
  3 in total

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