Structure and magnetochemical properties of a pyrophosphate-bridged tetranuclear nickel(II) complex

Abstract

Pyrophosphate (P2O74-) exhibits diverse bridging modes in multinuclear complexes, influencing structural assembly and magnetic exchange interactions through coordination geometry. New tetranuclear architectures arising from P2O74- coordination are explored. A discrete tetranuclear nickel(II) complex, [Ni4(Me3tacn)4(µ4-P2O7)(H2O)4(CH3CN)2](ClO4)4 (1), features a novel μ4- P2O74- bridge with two bidentate chelations and two monodentate coordinations, including both antiferromagnetic (−1.70 cm−1) and ferromagnetic (+1.10 cm−1) interactions between the nickel(II) centers linked by the P2O74- ligand.