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Updated: Feb 25, 2026

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
Published on: May 29, 2018
Formation of local spin-state concentration waves during the relaxation from a photoinduced state in a spin-crossover
Céline Mariette1, Elzbieta Trzop1, Serhane Zerdane1
1Institut de Physique de Rennes, UMR 6251, Univ. Rennes 1, CNRS, Campus de Beaulieu, 35042 Rennes, France.
Abstract:
The complex relaxation from the photoinduced high-spin phase (PIHS) to the low-spin phase of the bimetallic two-dimensional coordination spin-crossover polymer [Fe[(Hg(SCN)3)2](4,4'-bipy)2]n is reported. During the thermal relaxation, commensurate and incommensurate spin-state concentration waves (SSCWs) form. However, contrary to the steps forming at thermal equilibrium, associated with long-range SSCW order, the SSCWs forming during the relaxation from the PIHS phase correspond to short-range order, revealed by diffuse X-ray scattering. This is interpreted as resulting from the competition between the two types of SSCW order and another structural symmetry breaking, due to ligand ordering, occurring at low temperature and precluding long-range SSCW order.
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