Crystal structure and dynamic behavior of [Ni{PhNHC(S)NP(S)(OPri)2-S,S}2] complex in dichloromethane solution

The title complex has been found in crystal to be trans square-planar isomer with Ci symmetry (C). In solution three diamagnetic square-planar isomers - trans-chair-boat (A), cis-boat-boat (B), and trans-boat-boat (C) - are in slow exchange equilibria and undergo rather fast chemical exchange with minor (unobserved) paramagnetic pseudo-tetrahedral isomers (AT, BT, and CT). The thermodynamic constants, rate constants and activation parameters of these equilibria were calculated.