Substituent dependence on the spin crossover behaviour of mononuclear Fe(ii) complexes with asymmetric tridentate ligands
Substituent dependence on the spin crossover behaviour of mononuclear Fe(ii) complexes with asymmetric tridentate ligands
复制标题
具有不对称三齿配体的单核 Fe(ii) 配合物自旋交叉行为的取代基依赖性
DOI：
10.1039/c9dt00204a
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发表时间：
2019
影响因子：
4
通讯作者：
Oshio Hiroki
中科院分区：
文献类型：
--
作者：
Saiki Ryo;Miyamoto Haruka;Sagayama Hajime;Kumai Reiji;Newton Graham N.;Shiga Takuya;Oshio Hiroki
式为[FeII(H_2L1-3)_2](BF_4)_2·x(solv.)合成了具有不对称三齿配体的(H_2L1-3=2-[5-(R-苯基)-1H-吡唑-3-基]6-苯并咪唑吡啶；H_2L1：R=4-甲基苯基，H_2L2，R=2，3，4，6-三甲基苯基，H_2L3，R=2，3，4，5，6-五甲基苯基)(1，H_2L_1；2，H_2L_2；3，H_2L3)，并研究了它们的结构和磁性。观察到苯基和吡唑基之间的二面角发生了显著的结构扭曲，并发现这取决于取代基的性质。低温磁学研究表明，1和2表现出逐渐的自旋交叉行为，而3在1.8-300K之间保持高自旋态。
Three mononuclear iron(II) complexes of the formula [FeII(H2L1–3)2](BF4)2·x(solv.) (H2L1–3 = 2-[5-(R-phenyl)-1H-pyrazole-3-yl] 6-benzimidazole pyridine; H2L1: R = 4-methylphenyl, H2L2, R = 2,4,6-trimethylphenyl, H2L3, R = 2,3,4,5,6-pentamethylphenyl) (1, H2L1; 2, H2L2; 3, H2L3) with asymmetric tridentate ligands (H2L1–3) were synthesized and their structures and magnetic behaviour investigated. Significant structural distortions of the dihedral angles between phenyl and pyrazole groups were observed and found to depend on the nature of the substituent groups. Cryomagnetic studies reveal that 1 and 2 show gradual spin crossover behavior, while 3 remains in the high spin state between 1.8 and 300 K.