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- W2108873338 abstract "Abstract Crystalline [Fe(bppSMe) 2 ][BF 4 ] 2 ( 1 ; bppSMe=4‐(methylsulfanyl)‐2,6‐di(pyrazol‐1‐yl)pyridine) undergoes an abrupt spin‐crossover (SCO) event at 265±5 K. The crystals also undergo a separate phase transition near 205 K, involving a contraction of the unit‐cell a axis to one‐third of its original value (high‐temperature phase 1; Pbcn , Z =12; low‐temperature phase 2; Pbcn , Z =4). The SCO‐active phase 1 contains two unique molecular environments, one of which appears to undergo SCO more gradually than the other. In contrast, powder samples of 1 retain phase 1 between 140–300 K, although their SCO behaviour is essentially identical to the single crystals. The compounds [Fe(bppBr) 2 ][BF 4 ] 2 ( 2 ; bppBr=4‐bromo‐2,6‐di(pyrazol‐1‐yl)pyridine) and [Fe(bppI) 2 ][BF 4 ] 2 ( 3 ; bppI=4‐iodo‐2,6‐di(pyrazol‐1‐yl)‐pyridine) exhibit more gradual SCO near room temperature, and adopt phase 2 in both spin states. Comparison of 1 – 3 reveals that the more cooperative spin transition in 1 , and its separate crystallographic phase transition, can both be attributed to an intermolecular steric interaction involving the methylsulfanyl substituents. All three compounds exhibit the light‐induced excited‐spin‐state trapping (LIESST) effect with T (LIESST=70–80 K), but show complicated LIESST relaxation kinetics involving both weakly cooperative (exponential) and strongly cooperative (sigmoidal) components." @default.
- W2108873338 created "2016-06-24" @default.
- W2108873338 creator A5010756613 @default.
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- W2108873338 creator A5051330669 @default.
- W2108873338 creator A5067279444 @default.
- W2108873338 creator A5080861072 @default.
- W2108873338 date "2015-01-30" @default.
- W2108873338 modified "2023-10-18" @default.
- W2108873338 title "Decoupled Spin Crossover and Structural Phase Transition in a Molecular Iron(II) Complex" @default.
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