Synthesis, structure and magnetic properties of two complexes based on bis(maleonitriledithiolate)nickel(III)/copper(II) anion and 1-(4′-bromobenzyl)triphenylphosphinium

The preparation, crystal structures and magnetic properties of two complexes containing bis(maleonitriledithiolate)nickel(III)/copper(II) anion, [4BrBzTPP][Ni(mnt)2] (1) and [4BrBzTPP]2[Cu(mnt)2] (2) ([4BrBzTPP]+ = 1-(4′-bromobenzyl)triphenylphosphinium) are report here. The crystals of two complexes belong to the triclinic system with space group P-1. The [Ni(mnt)2]− anions form a stepwise stack for 1 through weak π···π stacking interactions, short C···S interactions between the neighboring anions, while the [Cu(mnt)2]2− anions and the [4BrBzTPP]+ cations in 2 are linked through CHS, CHN and CHCu hydrogen bonds. The difference of the stacking mode and the weak interactions in 1 and 2 results in the difference of the magnetic properties: complex 1 exhibits an activated magnetic behavior in the high-temperature range together with a Curie tail at lower temperature range, while 2 shows a ferromagnetic exchange interaction with θ = 25.65 K.