期刊
COORDINATION CHEMISTRY REVIEWS
卷 253, 期 19-20, 页码 2450-2459出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2009.06.004
关键词
Spin crossover; Tetraazamacrocycle; Iron(II) complexes; Iron(III) complexes; Cobalt(II) complexes; Cis-octahedral coordination environment; Trans-octahedral coordination environment
资金
- Deutsche Forschungsgemeinschaft [SPP 1137]
- Technische Universitat Kaiserslautern
- OPTIMAS
This review focusses on spin crossover complexes with octahedral metal ions which are bound to a tetraazamacrocyclic ligand and additionally either to two monodentate ligands or to one bidentate ligand. Macrocyclic ligands with a sufficiently large ring size prefer to coordinate to metal ions in an equatorial fashion yielding trans-octahedral coordination environments. In contrast, twelve-membered tetraazamacrocycles with high steric rigidity, such as 2,11-diaza[3.3](2,6)pyridinophanes or 2,11-dithia[3.3](2,6)pyridinophane, are prone to form cis-octahedral complexes. While the electronic and the steric properties of the coordinated tetraazamacrocycle in trans-octahedral complexes are very likely responsible for the paucity of observed spin transitions, the cis-octahedral coordination mode of the twelve-membered tetraazamacrocycles allows the preparation of an increasing number of mono- and oligonuclear spin crossover complexes with octahedral iron(II), iron(III) and cobalt(II) ions. (C) 2009 Elsevier B.V. All rights reserved.
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