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Neutron powder diffraction studies of two spin transition Fe II complexes under pressure
Author(s) -
Legrand Vincent,
Le Gac Frédéric,
Guionneau Philippe,
Létard JeanFrançois
Publication year - 2008
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889808006481
Subject(s) - spin crossover , neutron diffraction , spin transition , chemistry , powder diffraction , aniline , crystallography , diffraction , ambient pressure , materials science , crystal structure , thermodynamics , organic chemistry , physics , optics
The pressure dependences of the lattice parameters of two spin transition compounds have been derived from neutron powder diffraction measurements at ambient temperature. The study of Fe(PM–AzA) 2 (NCS) 2 [PM is N ‐2′‐pyridylmethylene and AzA is 4‐(phenylazo)aniline] has been used to validate this new type of investigation of spin crossover compounds, and the study of Fe(PM–BiA) 2 (NCS) 2 (BiA is 4‐aminobiphenyl) has allowed the atypical spin crossover behaviour of this compound under pressure to be explained. In addition, this complex exhibits a pressure‐induced structural transition with an associated symmetry change, inducing the transformation of Fe(PM–BiA) 2 (NCS) 2 into a different polymorph that avoids a first‐order spin transition in favour of continuous transition.