Low-spin and spin-crossover iron(ii) complexes with pyridyl-benzimidazole ligands: synthesis, and structural, magnetic and solution study

被引:8
作者
Brachnakova, Barbora [1 ]
Adamko Koziskova, Julia [2 ]
Kozisek, Jozef [2 ]
Melnikova, Eva [3 ]
Gal, Miroslav [3 ]
Herchel, Radovan [4 ]
Dubaj, Tibor [2 ]
Salitros, Ivan [1 ,4 ,5 ]
机构
[1] Slovak Univ Technol Bratislava, Fac Chem & Food Technol, Dept Inorgan Chem, SK-81237 Bratislava, Slovakia
[2] Slovak Univ Technol Bratislava, Fac Chem & Food Technol, Dept Phys Chem, SK-81237 Bratislava, Slovakia
[3] Slovak Univ Technol Bratislava, Fac Chem & Food Technol, Dept Inorgan Technol, SK-81237 Bratislava, Slovakia
[4] Palacky Univ, Reg Ctr Adv Technol & Mat, Dept Inorgan Chem, Fac Sci, 17 Listopadu 12, Olomouc 77146, Czech Republic
[5] Brno Univ Technol, Cent European Inst Technol, Purkynova 123, Brno 61200, Czech Republic
关键词
BASIS-SETS; ROOM-TEMPERATURE; TRANSITION; STATE; VALENCE;
D O I
10.1039/d0dt03497e
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Two tridentate ligands (L1 = 2,6-bis(1-(3,5-di-tert-butylbenzyl)-1H-benzimidazol-2-yl)pyridine and L2 = 2,6-bis(1-(4-tert-butylbenzyl)-1H-benzimidazol-2-yl)pyridine) and one didentate ligand (L3 = 1-(4-tert-butylbenzyl)-2-pyridine-2-yl-1H-benzimidazol) were used for the synthesis of eight mononuclear Fe(II) compounds 1-8 containing miscellaneous counterions. Single-crystal X-ray diffraction analysis confirmed the expected molecular structures of all the reported coordination compounds and revealed the octahedral geometry of metal centres in the complex dications of 1-8. Compounds 1-6 prepared from tridentate ligands were low-spin and, therefore, diamagnetic up to 400 K. On the other hand, compounds 7 and 8, in which the Fe(II) centre was coordinated with didentate ligand L3, exhibited temperature and light triggered spin-crossover behaviour. The theoretical calculations supported the experimental magnetic investigation and helped to explain the electronic structures of the reported complexes with respect to the occurrence of thermal and light induced spin state switching. In addition, the solution redox properties of compounds 1-8 were investigated by cyclic voltammetry.
引用
收藏
页码:17786 / 17795
页数:10
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