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Formation of local spin‐state concentration waves during the relaxation from a photoinduced state in a spin‐crossover polymer
Author(s) -
Mariette Céline,
Trzop Elzbieta,
Zerdane Serhane,
Fertey Pierre,
Zhang Daopeng,
Valverde-Muñoz Francisco J.,
Real José-Antonio,
Collet Eric
Publication year - 2017
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.604
H-Index - 33
ISSN - 2052-5206
DOI - 10.1107/s2052520617007685
Subject(s) - spin crossover , relaxation (psychology) , condensed matter physics , phase (matter) , spin (aerodynamics) , scattering , spin states , symmetry breaking , bimetallic strip , chemical physics , atmospheric temperature range , materials science , polymer , range (aeronautics) , thermal , chemistry , physics , nuclear magnetic resonance , thermodynamics , optics , metal , quantum mechanics , psychology , social psychology , metallurgy , composite material
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.