Effect of the Co–C(C60−) bond formation on magnetic properties of the ionic complex {cryptand[2,2,2]·(Na+)}·{CoIITPP·(C60−)}·(C6H4Cl2)2
作者： Dmitri V. Konarev , Salavat S. Khasanov , Akihiro Otsuka , Gunzi Saito , Rimma N. Lyubovskaya
DOI: 10.1039/B904293H
关键词: Electron paramagnetic resonance 、 Ionic complex 、 Cryptand 、 Magnetic susceptibility 、 Paramagnetism 、 Diffusion 、 Diamagnetism 、 Exchange interaction 、 Chemistry 、 Crystallography 、 Stereochemistry
摘要: A new ionic complex {cryptand[2,2,2]·(Na+)}·{CoIITPP·(C60−)}·(C6H4Cl2)2 has been obtained as single crystals by a diffusion technique. It involves coordination {CoIITPP·(C60−)} units and bulky {cryptand[2,2,2]·(Na+)} cations. The Co–C(C60−) bond is short (2.262(2) at 100 K) which provides ordering in the C60− anions. This first ordered structure of {CoIITPP·(C60−)}. bonds weaken upon heating to be 2.316(4) 250 K. As result, anions begin rotate K about Co–C between two orientations. diamagnetic from 4 up 320 dissociate above only form unbound paramagnetic CoIITPP C60˙− species. process accompanied reversible increase magnetic susceptibility appearance broad EPR signal with g = 2.1187 linewidth ∼120 mT (350 K). was attributed both C60˙−, showed strong exchange interaction.
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