Hybrid Spin-Crossover Conductor Exhibiting Unusual Variable-Temperature Electrical Conductivity

We describe the multistep synthesis of a new terthienyl-substituted QsalH ligand and an iron(3+) spin-crossover complex (1) containing this ligand, which electropolymerizes to produce a hybrid-conducting metallopolymer film (poly1). Variable-temperature magnetic susceptibility measurements demonstrate that spin-crossover is operative in the polymer film, and resistivity measurements on indium−tin oxide coated glass slides containing the polymer film exhibit intriguing temperature-dependent profiles.