Abstract

Heterospin polymeric complexes based on Ni(II) and Co(II) hexafluoroacetylacetonates and deprotonated iminonitroxide, 2-(2-hydroxy-5-nitrophenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-1-oxyl (HL), were synthesized. The [M^II(Hfac)L₂]^– anions (Hfac = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionate) in the complexes are linked into 1D–3D polymers by Na⁺, K⁺, Rb⁺, or Cs⁺ cations (I–V). An X-ray diffraction study of M^I[M^II(Hac)L₂] ∙ n(Me₂CO) (n = 0–2.5) demonstrated that the polymer structural motif is determined by alkali metal cation (CIF files CCDC nos. 1974139–1974143 for I–V). According to magnetic measurements, ferromagnetic interactions in the {LML} exchange clusters predominate in the solid phase, which gives rise to increase in the effective magnetic moment with decreasing temperature.

中文翻译：

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杂多旋聚合物MI [M II（Hfac）L 2]的合成，结构和磁性

摘要

基于Ni（II）和Co Heterospin聚合复合物（II）和hexafluoroacetylacetonates去质子iminonitroxide，2-（2-羟基-5-硝基苯基）-4,4,5,5-四甲基-4,5-二氢- 1 H ^ -合成了咪唑-1-氧基（HL）。络合物中的[M ^II（Hfac）L ₂ ] ^–阴离子（Hfac = 1,1,1,5,5,5-六氟-2,4-戊二酮酸酯）通过Na ⁺，K连接成1D–3D聚合物⁺，RB ⁺或Cs ⁺的阳离子（我- V）。M ^I [M ^II（Hac）L ₂ ]∙ n（Me ₂ CO）（n的X射线衍射研究= 0-2.5）证明了聚合物结构基序是由碱金属阳离子确定（CIF文件CCDC号1974139-1974143为。我- V）。根据磁测量，{LML}交换簇中的铁磁相互作用在固相中占主导地位，随着温度的降低，有效磁矩增加。