Syntheses, crystal structures, weak interactions, spectra, and thermal properties of two new ion-pair complexes based on di(nitriledithiolate)nickel(II) anion and 4-nitrobenzyl isoquinolinium

ABSTRACTThe chemical preparation, spectroscopic characterization, and crystal structures of two new ion-pair complexes, [4NO2BzIQl]2[Ni(mnt)2](1) and [4NO2BzIQl]2[Ni(i-mnt)2] (2) ([4NO2BzIQl]+ = 4-nitrobenzyl isoquinolinium, mnt2− = maleonitriledithiolate and i-mnt2− = iso-maleonitriledithiolate), have been reported. Both 1 and 2 crystallize in the triclinic system in space group P-1. The cations of 1 stack into a 1D alternating column through C–H···π, π···π and p···π interactions, while the [4NO2BzIQl]+ cations (C) and [Ni(i-mnt)2]2− anions (A) of 2 stack into another 1D alternative column with a A–CC–A–CC–A sequence. Weak N···Ni, C–H···Ni, C–H···N, C–H···S, and p···π interactions observed in 1 and 2 consolidate a 3D network structure. Thermal analysis reveals that 1 and 2 are stable up to 211°C and 208°C, respectively, and the final decomposition product of two complexes is nickel oxide.