Effects of ligand topology on the properties of dinuclear ruthenium complexes of bis-semiquinone bridging ligands

被引：17

作者：

Barthram, AM ^{[1
]}

Cleary, RL ^{[1
]}

Jeffery, JC ^{[1
]}

Couchman, SM ^{[1
]}

Ward, MD ^{[1
]}

机构：

[1] UNIV BRISTOL,SCH CHEM,BRISTOL BS8 1TS,AVON,ENGLAND

来源：

INORGANICA CHIMICA ACTA | 1998年 / 267卷 / 01期

关键词：

ruthenium complexes; semiquinone-bridged complexes; dinuclear complexes;

D O I：

10.1016/S0020-1693(97)05883-0

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The two ligands H4L1 and H4L2 were prepared in which two catechol donor groups are linked by vinyl groups to a central phenyl ring which is 1,3-substituted (for H4L1) or 1,4-substituted (for H4L2). These were used to prepare dinuclear complexes [{Ru((t)Bu(2)bipy)(2)}(2)(mu-L)](2+) (L=L-1, complex 1; or L-2, complex 2) in which aerial oxidation of the catecholate ligands to the semiquinone state has occurred. In 2 the two unpaired electrons that would be expected for two semiquinones can pair up to give a diamagnetic complex with a quinonoidal bridge, due to the 1,4-substitution pattern of the phenyl spacer; in 1 this cannot occur due to the 1,3 substitution pattern and the complex is a diradical as shown by EPR, spectroscopy. (C) 1998 Elsevier Science S.A.

引用

页码：1 / 5

页数：5

共 16 条

[1] DINUCLEATING, TRINUCLEATING, AND TETRANUCLEATING PYRIDYL LIGANDS WHICH FACILITATE MULTICENTER MAGNETIC EXCHANGE BETWEEN PARAMAGNETIC MOLYBDENUM CENTERS [J].