| Summary: | We report herein on five new Fe(II) complexes of general formula [Fe(L)<sub>2</sub>(NCCH<sub>3</sub>)<sub>2</sub>](BF<sub>4</sub>)<sub>2</sub>•<i>x</i>CH<sub>3</sub>CN (L = substituted 2-pyridylimine-based ligands). The influence of proximally located electron withdrawing groups (e.g., NO<sub>2</sub>, CN, CF<sub>3</sub>, Cl, Br) bound to coordinated pyridylimine ligands has been studied for the effect on spin crossover in their Fe(II) complexes. Variable-temperature UV-visible spectroscopic studies performed on complexes with more strongly electronegative ligand substituents revealed spin crossover (SCO) in the solution, and thermodynamic parameters associated with the spin crossover were estimated.
|
|---|