Synthesis and magnetic properties of tetrahedral tetranuclear iron(II) complexes with bis(bidentate)-type Schiff bases containing imidazole groups

被引：7
作者：
Tanaka, Tsubasa [1 ]
Sunatsuki, Yukinari [1 ]
Suzuki, Takayoshi [1 ,2 ]
机构：
[1] Okayama Univ, Grad Sch Nat Sci & Technol, Dept Chem, Okayama 7008530, Japan
[2] Okayama Univ, Res Inst Interdisciplinary Sci, Okayama 7008530, Japan
来源：
INORGANICA CHIMICA ACTA | 2020年 / 502卷
关键词：
Iron(II) complexes; Tetrahedral tetranuclear complex; Hydrogen bonding network; Bis(bidentate)-type ligand; Imidazole containing ligand; HYDROGEN-BOND; LIGAND; POTENTIALS; DISCRETE; SERIES; CAGE;
D O I：
10.1016/j.ica.2019.119373
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Two new tetranuclear iron(II) complexes, [Fe-4(H2LH)(6)](ClO4)(8) (1ClO(4): H2LH = N,N'-bis(imidazole-4-ylmethylidene)-1.4-diaminobenzene) and [Fe-4(H2LMe)(6)](BF4)(8) (2BF(4): H2LMe = N,N'-bis(5-methylimidazole-4-ylmethylidene)-1.4-diaminobenzene), were synthesized from Fe(ClO4 or BF4)(2)center dot 6H(2)O, 1.4-diaminobenzene and 4-formylimidazole or 5-methyl-4-formylimidazole. X-ray analysis revealed that these complexes have a tetrahedral structure with four iron(II) ions at the apexes and the bridging bis(bidentate) ligands on the edges. The internal space of the tetrahedron was filled with the phenylene segments of the bridging ligands. Magnetic susceptibility studies indicated that both 1ClO(4) and 2BF(4) showed gradual but incomplete spin-crossover (SCO) behavior, because the densely packed tetrahedral structure could prevent the contraction of the Fe-N bonds on the highspin to low-spin transition.
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页数：6
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