Ligand dynamics controlled reverse spin cross over in bis pyrazolyl pyridine based Fe(II) complex cation with metallodithiolato anions with an example of a ferromagnetic 2:1 cocrystal of mixed Ni(III)/Ni(II) oxidation states

► This work covers a wide area of comprehensive connectivity of properties of three compounds. ► One of them resulted from a cocrystallization of Nickel(II/III). ► Lattice dynamics is correlated to reverse spin transition as brought out by Mossbauer and ESCA. ►Variable temperature magnetic studies and EPR reveal spin dynamics through exchange interactions and charge transfer.