title: The thermal and light induced spin transition in [FeL2](BF4)2 (L = 2,6-dipyrazol-1-yl-4-hydroxymethylpyridine).
abstract: This communication presents the crystal structures of the high spin state at 300 K, the low spin state at 30 K and the metastable high spin state after irradiation at 30 K and an estimate of the critical LIESST temperature of [FeL2](BF4)2 which is shown to undergo a spin transition at 271 K.
authors.affiliation: Chemistry Department, Durham University, South Road, Durham, UK DH1 3LE.
authors.forename: V A
authors.initials: VA
authors.lastname: Money
authors.forename: J
authors.initials: J
authors.lastname: Elhaïk
authors.forename: M A
authors.initials: MA
authors.lastname: Halcrow
authors.forename: J A K
authors.initials: JA
authors.lastname: Howard