Substituent dependence on the spin crossover behaviour of mononuclear Fe(<scp>ii</scp>) complexes with asymmetric tridentate ligands
作者:Ryo Saiki、Haruka Miyamoto、Hajime Sagayama、Reiji Kumai、Graham N. Newton、Takuya Shiga、Hiroki Oshio
DOI:10.1039/c9dt00204a
日期:——
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
三个单核铁(II)下式的配合物的[Fe II(H 2大号1-3)2 ](BF 4)2 · X(溶剂)(H 2大号1-3 = 2- [5-(R-苯基)-1 H-吡唑-3-基] 6-苯并咪唑吡啶; H 2 L 1:R = 4-甲基苯基,H 2 L 2,R = 2,4,6-三甲基苯基,H 2 L 3,R = 2,3,4,5,6-五甲基苯基)(1,H 2 L 1 ; 2,H 2 L2 ; 合成了具有不对称三齿配体(H 2 L 1–3)的3,H 2 L 3),并研究了它们的结构和磁行为。观察到苯基和吡唑基团之间的二面角的显着结构变形,并发现其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和1.8保持在1.8至300 K之间的高自旋状态。