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Magnetochemistry 2015, 1(1), 3-16; doi:10.3390/magnetochemistry1010003

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
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)
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Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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