Spin-crossover in cobalt(II) compounds containing terpyridine and its derivatives
Spin-crossover in cobalt(II) compounds containing terpyridine and its derivatives
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DOI：
10.1016/j.ccr.2011.05.016
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发表时间：
2011-09-01
影响因子：
20.6
通讯作者：
Lee, Young Noon
中科院分区：
文献类型：
--
作者：
Hayami, Shinya;Komatsu, Yasuka;Lee, Young Noon
在这篇综述文章中，我们讨论了钴（II）化合物的独特和新颖的磁性与各种三萜衍生物，包括取代基在4位。并与未取代的三元钴（II）配合物进行了比较。自首次报道SCO钴（II）配体三元配合物以来，该体系得到了广泛的研究。具有terpy或OH-terpy配体的SCO钴（II）配合物表现出不完全或逐渐的SCO行为。pyterpy-阑尾钴（II）配合物根据所涉及的客体分子表现出SCO。合成了具有长烷基化terpy配体的钴（II）配合物[Co(Cn-terpy)(2)](BF4)(2)(n = 16,14和12)，其中一些配合物通过单晶x射线分析进行了表征。此外，变温磁化率表明非溶剂化化合物[Co(Cn-terpy)(2)](BF4)(2) （n = 16）。14和12)在室温附近表现出“反向自旋跃迁”现象，热滞后较大。此外，溶剂化化合物[Co(C12-terPY)(2)](BF4)（2中心点）EtOH中心点0.5H(2)O表现出“重入SCO”行为。SCO钴（II）配合物中的长烷基链可以通过SCO和对外部刺激的灵活性反应之间的协同作用产生新的物理性质。(C) 2011 Elsevier B.V.版权所有
In this review article we discuss the unique and novel magnetic properties for the cobalt(II) compounds with a variety of terpy derivatives including substituents at the 4-position. These are also compared with the unsubstituted terpy cobalt(II) complex. Since the first SCO cobalt(II) complex with terpy ligand was reported, this system has been widely studied. SCO cobalt(II) complexes possessing terpy or OH-terpy ligand reveal incomplete or gradual SCO behavior. The pyterpy-appendecl cobalt(II) complex shows SCO depending on the guest molecules involved. Cobalt(II) complexes with long-alkylated terpy ligands, [Co(Cn-terpy)(2)](BF4)(2)(n = 16, 14 and 12) have been synthesized and some were characterized by single crystal X-ray analysis. Furthermore, variable-temperature magnetic susceptibility indicated that the non-solvated compounds [Co(Cn-terpy)(2)](BF4)(2) (n = 16. 14 and 12) exhibit "reverse spin transition" phenomenon with wide thermal hysteresis around room temperature. In addition, the solvated compound [Co(C12-terPY)(2)](BF4)(2 center dot)EtOH center dot 0.5H(2)O shows "re-entrant SCO" behavior. The long alkyl chains in SCO cobalt(II) complexes can lead to novel physical properties resulting from a synergetic effect between SCO and response of the flexibility toward external stimuli. (C) 2011 Elsevier B.V. All rights reserved.