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

Authors：Liu Jin Fang; Ye Hui Qing; Li Yi Yuan; Wu Xu Xian; Wang Xiao Jue; Zhou Jia Rong^*; Liu Xiao Ping; Yang Le Min; Ni Chun Lin

Source：Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry, 2014, 44(5): 664-671.

DOI：10.1080/15533174.2013.783864

• crystal structures
• magnetic properties
• substituted benzyl 1-methylimidazolium
• weak interactions

In two new bis(maleonitriledithiolate)copper(II) salts, [Bz-1-MeIm](2)[Cu(mnt)(2)] (1) and [4-NO(2)Bz-1-MeIm](2)[Cu(mnt)(2)] (2) ([Bz-1-MeIm](+) = Bz-1-MeMz = 1-methyl-3-benzylimidazolium; [4-NO(2)Bz-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 P2(1)/c. The cations and anions stack alternately into a column by pi center dot center dot center dot pi and C-H center dot center dot center dot pi interactions, and the C-H center dot center dot center dot N and C-H center dot center dot center dot 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 theta = -255.98 K, whereas 2 shows weak ferromagnetic coupling with theta = 0.527 K.

• Institution
  中国农业大学; 华南农业大学