Polymorphic alternating HNN-cobalt(II) chains both behaving as single-chain magnets (HNN=4,4,5,5-tetramethylimidazolin-1-oxyl 3-oxide)
Polymorphic alternating HNN-cobalt(II) chains both behaving as single-chain magnets (HNN=4,4,5,5-tetramethylimidazolin-1-oxyl 3-oxide)
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DOI：
10.1021/ic052119k
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发表时间：
2006-05-15
影响因子：
4.6
通讯作者：
Nogami, T
中科院分区：
文献类型：
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作者：
Ishii, N;Ishida, T;Nogami, T
金属 - 自由基交替链[Co(hfac)(2)HNN](n)结晶为两种形态，就O - HNN - Co - O - HNN几何结构而言，分别包含重复的全顺式（α）和顺式，顺式，反式（β）构型（HNN = 4,4,5,5 - 四甲基咪唑啉 - 1 - 氧基 - 3 - 氧化物）。两种相在2 K时都显示出具有磁滞的磁化跃迁。R相具有相对较高的磁化重取向活化能（193 K）。
Metal-radical alternating chains [Co(hfac)(2)HNN](n) crystallized in two morphs containing repeating all-cis (alpha) and cis, cis, trans (beta) configurations with respect to the O-HNN-Co-O-HNN geometry (HNN = 4,4,5,5-tetramethylimidazolin-1-oxyl 3-oxide). Both phases showed magnetization jumps with hysteresis at 2 K. The R phase has a relatively high activation energy of magnetization reorientation (193 K).