Journal
COORDINATION CHEMISTRY REVIEWS
Volume 253, Issue 21-22, Pages 2493-2514Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2009.07.009
Keywords
Tridentate ligands; Synthesis; Iron complexes; Spin-crossover; LIESST
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Synthetic procedures are available for the derivatisation of almost every position of the 2,6-di(pyrazol-1-yl)pyridine (1-bpp) skeleton. This has led to the preparation of a large number of iron(II) complexes of the (Fe(1-bpp)(2)](2+) type,many of which undergo spin-cross over transitions at accessible temperatures, sometimes around room temperature. This review surveys these compounds, and presents a wider discussion of their structural chemistry and photomagnetic properties. The availability of a series of chemically similar spin-transition materials has allowed trends in their behaviour to be identified and correlated with their molecular and lattice structures. This represents a rare, positively identified structure: function relationship for spin-crossover materials. Other topics under discussion are the existence of a novel angular Jahn-Teller distortion in several of these compounds and its consequences for spin-crossover: and, the normal and abnormal behaviour of different [Fe(1-bpp)(2)](2+) materials trapped in metastable high-spin states at low temperature. (C) 2009 Elsevier B.V. All rights reserved.
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