Iron(II), Non-covalent interactions (Lone pair–π, CH…π, π…π and CH…F), Pyrazole, Pyridine, Pyrimidine, Spin crossover, SYSTEM, LIGAND SUBSTITUTION, STABILIZATION, STATE, POLYMORPHISM, Non-covalent interactions (Lone pair-pi, CH center dot center dot center dot pi, pi center dot center dot center dot pi and CH center dot center dot center dot F), SALTS, TRANSITION, TEMPERATURE, 2,6-DI(PYRAZOL-1-YL)PYRIDINE, JAHN-TELLER DISTORTION
