2D crystal structure, magnetic behavior and theoretic analysis of two new molecular solids based on Ni(maleonitriledithiolate)2 monoanion with substituted 2-aminopyridinium |
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| Authors: | Yong Hou Xiao-Dan Xie Jia-Rong Zhou Qian Huang Chun-Lin Ni Xue-Lei Hu |
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| Institution: | a Department of Applied Chemistry, Centre of Inorganic Functional Materials, College of Science, South China Agricultural University, 510642 Guangzhou, PR China
b School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, 430073 Wuhan, PR China |
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| Abstract: | Two new molecular solids, BzPyNH2]Ni(mnt)2](1) and 2-NpCH2PyNH2]Ni(mnt)2](2) (mnt2− = maleonitriledithiolate, BzPyNH2]+ = 1-benzyl-2-aminopyridinium and 2-NpCH2PyNH2]+ = 1-(2′-naphthylmethylene)-2-aminopyridinium) have been characterized structurally and magnetically. The Ni(Ш) ions of 1 and 2 form a 1D magnetic chain within a Ni(mnt)2]− column through Ni?N or π?π interactions. Some weak interactions observed in 1 and 2 give further rise to a 2D structure. The overlapping fashions of the Ni(mnt)2]− anions are different when the 2-aminopyridine ring was fixed and the phenyl ring changed into the naphthyl ring of the cation. Magnetic susceptibility measurements in the temperature range 2-300 K show that 1 is weak antiferromagnetic coupling, while 2 exhibits a novel and interesting spin-gap transition around 140 K with Δ/kb = 381.4 K. |
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| Keywords: | Bis(maleonitriledithiolate)nickelate(III) anion Substituted 2-aminopyridinium Crystal structure Magnetic properties Spin-gap transition |
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