What is it about?
The magnetic properties in solid an solutiion of three spin‐crossover complexes based on bis(imidazolyl)ketone ligands. The alkyl and vinyl R groups have weak influence on the transition temperature, T1/2, in solution, while stronger differences are observed in the solid state, because different intermolecular interactions. The spin‐state equilibria in solution were followed by SQUID magnetometry, UV-vis, Evans NMR, Variable temp 1H NMR method. Interestingly, the equilibria cwas most efficiently probed by following the temperature dependence of an adequately chosen 1H chemical shift. Overall, these experiments give coherent results, with T1/2 located between 320 and 335 K, a narrow range, in comparison with the solid state.
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Why is it important?
detail experimental analysis of spin crossover process in solution and solid using different experimental techniques (using variable temp 1H NMR, Evans NMR, susceptibility through SQUID, UV-vis) and DFT analysis.
Perspectives
Finally, variable‐temperature susceptibility data were used to analyse the spin‐transition process in the solid state and to extract the associated thermodynamic parameters. The spin‐transition temperatures, which are close to each other in solution, are clearly spread in a broader temperature range in the solid state. The intermolecular interactions and the solid‐state organization clearly affect the energetics of the system. Overall, the spin transitions remain gradual, with almost no cooperative effect, as only weak intramolecular interactions are observed in the structures of compounds
Dr. SIDDHARTHA DE
Centre National de la Recherche Scientifique
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This page is a summary of: Solution and Solid-State Study of the Spin-Crossover [FeII
(R-bik)3
](BF4
)2
Complexes (R = Me, Et, Vinyl), European Journal of Inorganic Chemistry, December 2017, Wiley,
DOI: 10.1002/ejic.201701013.
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