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The Spin‐Crossover Phenomenon at the Coherent‐Domains Scale in 1D Polymeric Powders: Evidence for Structural Fatigability
Author(s) -
Grosjean Arnaud,
Daro Nathalie,
Pechev Stanislav,
Moulet Lucie,
Etrillard Céline,
Chastanet Guillaume,
Guionneau Philippe
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201501164
Subject(s) - spin crossover , chemistry , deprotonation , crystallography , crystal structure , crossover , crystal (programming language) , triazole , ion , organic chemistry , artificial intelligence , computer science , programming language
The coherent‐domain morphology was determined for a crystalline powder of the 1D polymeric spin‐crossover [Fe(Htrz) 2 (trz)](BF 4 ) {Htrz = 1 H ‐1,2,4‐triazole, trz = deprotonated triazolato(–) ligand} compound. This morphology is in adequacy with the crystal packing and proved that the long axis of the domain corresponds to the iron–triazole chains axis, which gives information on the crystal‐growth process. Furthermore, thermal cycling clearly demonstrated that the coherent‐domain length strongly and continuously decreased as a function of the number of spin‐crossover cycles undergone. The degradation in the crystalline quality corresponds to a break in the [Fe(Htrz) 2 (trz)] + chains. This structural fatigability was confirmed by similar observations on a close spin‐crossover compound, [Fe(NH 2 trz) 3 ](NO 3 ) 2 · H 2 O, showing that a few hundreds of thermal spin‐crossover cycles could destroy the crystalline aspect of the sample.