Synthesis, crystal structures and magnetic properties of three complexes containing bis(maleonitriledithiolate) copper(II) anion and meta-substituted benzyl isoquinolinium cations

Authors：Zhang Zheng; He Wan Er; Liao Xuan; Chen Xiao Min; Lin Xue Ni; Yao Zi Mei; Ni Chun Lin^*; Zhou Jia Rong; Yang Le Min; Zhang Yao Mou^*

Source：Transition Metal Chemistry, 2016, 41(3): 249-259.

DOI：10.1007/s11243-015-0016-1

Three complexes, [3RBzIQl](2)[Cu(mnt)(2)] (mnt(2-) = maleonitriledithiolate; [3RBzIQl](+) = 1-(3'-R-benzyl)isoquinolinium, R = Cl (1), I (2) or NO2 (3)), have been prepared and characterized by spectroscopic and physicochemical methods as well as by X-ray crystallography. The [Cu(mnt)(2)](2-) anions formed a 1D chain in complex 1, a dimer in 2 and a sheet structure in 3 through C center dot center dot center dot N and/or N center dot center dot center dot N interactions. The neighboring dimers of the cations arranged in a boat-type pattern stack into columns through weak pi center dot center dot center dot pi, Cl center dot center dot center dot pi or O center dot center dot center dot pi, C-H center dot center dot center dot pi interactions. The anions and cations stack together into a columnar structure with a center dot center dot center dot A-CC-A-CC-A center dot center dot center dot sequence. The magnetic susceptibilities measured in the temperature range 2.0-300 K reveal that complex 1 undergoes a change from weak ferromagnetic to antiferromagnetic exchange around 132 K, while 2 shows antiferromagnetic behavior and 3 shows a weak ferromagnetic interaction when the temperature is lowered.

• Institution
  中国农业大学; 华南农业大学