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• W2061330771 abstract "The syntheses of 2,6-bis(4-chloropyrazol-1-yl)pyridine (L1), 2,6-bis(4-bromopyrazol-1-yl)pyridine (L2) and 2,6-bis(4-iodopyrazol-1-yl)pyridine (L3) by electrophilic halogenation of 2,6-bis(pyrazol-1-yl)pyridine are reported. The complex [Fe(L1)2][BF4]2 crystallises in two different solvent-free polymorphs. The tetragonal (α) form crystallises in a known version of the “terpyridine embrace” structure, and undergoes an abrupt spin-transition at 202 K. The orthorhombic (β) form exhibits a modified form of the same packing motif, containing two unique iron sites in a 2 : 1 ratio. One-third of the complex molecules in that material undergo a very gradual thermal spin-crossover centred at 137 K. Comparison of the two structures implies that spin-crossover cooperativity in the α-polymorph is transmitted in two dimensions within the extended lattice. [Fe(L2)2][BF4]2 is isostructural with α-[Fe(L1)2][BF4]2 and exhibits a similarly abrupt spin-transition at 253 K. In contrast, [Fe(L3)2][BF4]2 is low-spin as a powder at 360 K and below and can be crystallised as two different solvates from acetone solution. All three compounds exhibit the LIESST effect at 10 K, with photoconversions of 40–100%. Their LIESST relaxation temperatures obey the empirical T(LIESST) = T0− 0.3T1/2 (T0 = 150 K) law that we have previously proposed for this class of compound." @default.
• W2061330771 created "2016-06-24" @default.
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• W2061330771 date "2009-01-01" @default.
• W2061330771 modified "2023-09-24" @default.
• W2061330771 title "Thermal and light-induced spin-transitions in iron(ii) complexes of 2,6-bis(4-halopyrazolyl)pyridines: the influence of polymorphism on a spin-crossover compound" @default.
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• W2061330771 doi "https://doi.org/10.1039/b907094j" @default.
• W2061330771 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19672511" @default.
• W2061330771 hasPublicationYear "2009" @default.
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