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.