Light- and temperature-assisted spin state annealing: accessing the hidden multistability

Among responsive multistable materials, spin crossover (SCO) systems are of particular interest for stabilizing multiple spin states with various stimulus inputs and physical outputs. Here, in a 2D Hofmann-type coordination polymer, [Fe(isoq) 2 {Au(CN) 2 } 2 ] (isoq = isoquinoline), a medium-tempera...

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Bibliographic Details
Published in:	Chemical science (Cambridge) Vol. 11; no. 12; pp. 3281 - 3289
Main Authors:	Chen, Yan-Cong, Meng, Yan, Dong, Yan-Jie, Song, Xiao-Wei, Huang, Guo-Zhang, Zhang, Chuan-Lei, Ni, Zhao-Ping, Nava ík, Jakub, Malina, Ond ej, Zbo il, Radek, Tong, Ming-Liang
Format:	Journal Article
Language:	English
Published:	Cambridge Royal Society of Chemistry 28-03-2020 The Royal Society of Chemistry
Subjects:	Annealing Chemistry Coordination polymers Crossovers Crystal structure Crystallography Gold Magnetism
Online Access:	Get full text
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Summary:	Among responsive multistable materials, spin crossover (SCO) systems are of particular interest for stabilizing multiple spin states with various stimulus inputs and physical outputs. Here, in a 2D Hofmann-type coordination polymer, [Fe(isoq) 2 {Au(CN) 2 } 2 ] (isoq = isoquinoline), a medium-temperature annealing process is introduced after light/temperature stimulation, which accesses the hidden multistability of the spin state. With the combined effort of magnetic, crystallographic and Mössbauer spectral investigation, these distinct spin states are identified and the light- and temperature-assisted transition pathways are clarified. Such excitation-relaxation and trapping-relaxation joint mechanisms, as ingenious interplays between the kinetic and thermodynamic effects, uncover hidden possibilities for the discovery of multistable materials and the development of multistate intelligent devices. Two new two-stage manipulation protocols, namely light- and temperature-assisted spin state annealing (LASSA/TASSA), are applied to a spin crossover coordination polymer, [Fe(isoq) 2 {Au(CN) 2 } 2 ], revealing the hidden multistability of spin states.
Bibliography:	For ESI and crystallographic data in CIF or other electronic format see DOI 1918986-1918989 10.1039/c9sc05971g Electronic supplementary information (ESI) available: Additional figures for magnetism, photomagnetism, the crystal structure and structural parameters. CCDC ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 These authors contributed equally to this work.
ISSN:	2041-6520 2041-6539
DOI:	10.1039/c9sc05971g