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Comparison of low temperature and high pressure effects on the structural behaviour of two iron (II) spin transition complexes: Fe(Phen)2(NCS)2 and Fe(Btz)2(NCS)2

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Butlletí de les Societats Catalanes de Física, Química, Matemàtiques i Tecnologia
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  • Engineering

Abstract

Comparison of low temperature and high pressure effects on the structural behaviour of two iron (II) spin transition complexes: Fe(Phen)2(NCS)2 and Fe(Btz)2(NCS)2 COMPAKISON OI^ LOW TEMPERATURE. AND HIGH PRESSURE EI^I^ECTS ON THE STRUCTURAL BEHAVIOUR Oh TWO IRON (II) SPIN TRANSITION COMPLEXES: FE(PHEN),(NCS), ANI^ FE(BTZ),(NCS), T. GRANIER, B. GALLOIS, F. SUL:L-PANAMA, J. GAULTIER, J.A. RF.AI ~- and J.l_AKEM130WITCH'^-'^ Laboratoire de Cristallographie et de Physique Crisrilline UKA 144 CNRS Univcrsitc de Bordeaux I, 33405 - Tslence Cedex , France ^^^llepartamento de CZuimica Inorganics, Universitat de Valencia, 46100 Burjassot, Spain ^^^^`Laboratoire de Chimic Inorganique , URA 420 CNRS, Univcrsitc de Paris-Sud, 91405 Orsay, France Spin transition phenomenon was first evidenced in 1931 by L. Csmbi and A. Cagnssso, on tris (N,N-dialkvldithiocarbamsto) iron ([II) comple- tes and has been observed, since then, on numerous first row transition me- tal complexes with d^ to d'electronic configurations. Such compounds have bccn attracting a lot of attention for the last l5 years, both from theoretical and cxprrimental sides, while potentially interesting applications are expec- ted in molecular electronics (J. "laecmbowiuh and C). Kahn, 1991). Although its investigation has called for various techniques, several as- pects of spin transition mechanism still remain unrlear.:Vlore particularly, if it is admitted that physical and structural properties are su-ongly correla- ted in these materials, the part that some sn-ucnnal parameters play in the rhsrartcristics of the spin transition is still to be defined. Cane of the reasons of this lark of coinprehension comes certainly kom the fact that most o f the complexes that have bccn studied arc polvcrysrilline samples, which pre- vents troni systenritic full sn-ucture im^estigations. We present in the following s comparative structural X-ray diffraction sn^dy ronductrd as a function of temperanu-e or pressure, on single cry

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