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Magnetochemistry: An Old Discipline with New Opportunities
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Synthesis of 4-Hydroxy-2,6-di(pyrazol-1-yl)pyridine, and the Spin State Behaviour of Its Iron(II) Complex Salts

School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
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Academic Editor: Guillem Aromí
Magnetochemistry 2015, 1(1), 3-16; https://doi.org/10.3390/magnetochemistry1010003
Received: 3 September 2015 / Revised: 2 October 2015 / Accepted: 12 October 2015 / Published: 23 October 2015
(This article belongs to the Special Issue Spin Crossover (SCO) Research)
Treatment of 4-hydroxy-2,6-dibromopyridine with four equivalent of deprotonated pyrazole in hot diglyme affords 4-hydroxy-2,6-di(pyrazol-1-yl)pyridine (L) in low yield. The three complex salts [FeL2]X2 (X = BF4, 1; X = ClO4, 2; X = PF6, 3) have been prepared, and crystallographically characterised as their methanol solvates. The solvate structures contain complexes that are fully high-spin (1 and 3), or in a mixed high:low spin state population at 150 K (2). Bulk samples of 1 and 2 obtained from methanol/diethyl ether contain a second, minor crystal phase that exhibits an abrupt spin-transition near 200 K. Recrystallisation of 1 and 2 from nitromethane/diethyl ether affords powder samples that are highly enriched in this spin-transition phase. View Full-Text
Keywords: iron; N-donor ligand; spin-crossover; crystal structure; magnetic measurements; calorimetry iron; N-donor ligand; spin-crossover; crystal structure; magnetic measurements; calorimetry
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Cook, L.J.K.; Halcrow, M.A. Synthesis of 4-Hydroxy-2,6-di(pyrazol-1-yl)pyridine, and the Spin State Behaviour of Its Iron(II) Complex Salts. Magnetochemistry 2015, 1, 3-16.

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