A New Family of Spin-Crossover Complexes Based on a Fe^II(Tetrazolyl)₄(MeCN)₂-Type Core

A bitopic ligand 2-hydroxy-1-(tetrazol-1-yl)-3-(tetrazol-2-yl)propane (12pbtzOH) was synthesized and reacted with Fe(ClO₄)₂·6H₂O, giving a 1D coordination polymer {[Fe(12pbtzOH)₂(CH₃CN)₂](ClO₄)₂·2CH₃CN}_∞ that exhibits a high-spin to low-spin transition (T_1/2^↓ = T_1/2^↑ ≅ 104 K). This is an unprecedented example of an iron(II) complex containing Fe(tetrazolyl)₄(MeCN)₂ cores.