Spin transitions in non-classical systems
作者： V. I. Ovcharenko , K. Yu. Maryunina , S. V. Fokin , E. V. Tretyakov , G. V. Romanenko
DOI: 10.1007/S11172-005-0136-4
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摘要: Peculiarities of synthesis chain polymeric, copper(II) hexafluoroacetylacetonate based complexes with stable nitroxyl radicals and the results studies on correlations between magnetic properties structure these compounds are summarized. Temperature variation causes structural rearrangements in solid phases compounds, accompanied by effects similar to spin crossover phenomena. Magnetic anomalies induced phase transitions originate from specific motions Jahn—Teller coordination units containing two types exchange clusters, Cu2+—O·—N N—·O—Cu2+—O·—N<, significant changes crystal volume after multiple cooling/heating cycles. Chemical methods controlling character temperature both formation solutions mixed metal hexafluoroacetylacetonates same radical, {Cu1−xMx(hfac)2L} (M = Mn, Ni, Co), different radicals, {Cu(hfac)2LxL′1−x}, discussed. Specific influence isotope substitution CH3 → CD3 paramagnetic ligand heterospin polymer anomaly is
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