Syntheses, Crystal Structures, Weak Interactions, and Magnetic Properties of Two Bis(maleonitriledithiolate)copper(II) Salts with Substituted Benzyl 1-Methylimidazolium

Abstract

In two new bis(maleonitriledithiolate)copper(II) salts, [Bz-1-MeIm]2[Cu(mnt)2] (1) and [4-NO2Bz-1-MeIm]2[Cu(mnt)2] (2) ([Bz-1-MeIm]+ = Bz-1-MeMz = 1-methyl-3-benzylimidazolium; [4-NO2Bz-1-MeIm]+ = 1-methyl-3-(4′-nitrobenzyl)imidazolium), 1 crystallizes in the triclinic system with space group P-1, whereas 2 crystallizes in the monoclinic system with space group P21/c. The cations and anions stack alternately into a column by π···π and C‒H···π interactions, and the C‒H···N and C‒H···O hydrogen bonds consolidate the crystal packing and give further rise to a 3D network structure. Magnetic susceptibility measurements show that 1 displays strong antiferromagnetic interaction with θ = –255.98 K, whereas 2 shows weak ferromagnetic coupling with θ = 0.527 K.