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

► The [Ni(mnt)2]− anions in 1 form a stepwise stack. ► The CHS, CHN and CHCu hydrogen bonds are found in 2. ► The difference of the stacking mode results in the different magnetic properties. ► Complex 1 exhibits an activated magnetic behavior. ► Complex 2 shows a ferromagnetic exchange interaction.