Syntheses, structures, and magnetic properties of two new molecular magnets containing Ni(mnt)2 monoanion and substituted 4-dimethylaminopyridinium |
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| Authors: | Yong Hou Qian Huang Xiao-Ping Liu Lin-Liang Yu |
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| Institution: | a Department of Applied Chemistry, College of Science, South China Agricultural University, Guangzhou 510642, PR China
b Centre of Inorganic Functional Materials, South China Agricultural University, Guangzhou 510642, PR China |
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| Abstract: | Two new molecular magnets, BzPyN(CH3)2]Ni(mnt)2] (1) and NO2BzPyN(CH3)2]Ni(mnt)2] (2)(BzPyN(CH3)2]+ = 1-benzyl-4-dimethylaminopyridinium, NO2BzPyN(CH3)2]+ = 1-(4′-nitrobenzyl)-4-dimethylaminopyridinium, and mnt2− = maleonitriledithiolate) have been prepared and characterized by elemental analyses, IR, MS spectra, single crystal X-ray diffraction and magnetic susceptibility. The Ni(III) ions of both 1 and 2 form a 1D zigzag alternating magnetic chain within a  column through Ni?S, Ni?Ni, Ni?N, S?S, or π?π interactions. Magnetic susceptibility measurements in the temperature range 1.8-300 K show that 1 exhibits antiferromagnetic behavior, while 2 shows a spin gap transition around 170 K, and antiferromagnetic interaction in the high-temperature phase (HT) and spin gap in the low-temperature phase (LT). The phase transition for 2 is second-order by determination of DSC analyses. |
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| Keywords: | Bis(maleonitriledithiolato)nickelate compound 1-Benzyl-4-aminopyridinium 1-(4&prime -Nitrobenzyl)-4-dimethylaminopyridinium Crystal structures Antiferromagnetic coupling Spin gap transition |
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