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The Long-Chain N-Alkylpyridinium Cation Modulate Magnetic Behaviors of Metal-bis-1,2-dithiolene Compounds

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Abstract

Two metal-dithiolene compounds with a formula of [Cn-py][Ni(mnt)2] (Cn-py+ represents the 1-alkyl-pyridinium cation, n = 8 (denoted as compound 1), and 9 (denoted as compound 2); mnt2− = maleonitriledithiolate) were synthesized and characterized. The crystal structures determined for two compounds disclosed that these are isostructural with similar cell parameters and packing structures. The cation adopts a bent conformation and the direction of the hydrocarbon chain is approximately parallel to the long molecular axis of the [Ni(mnt)2]− anions, and the [Ni(mnt)2]− anions and cations of 1 and 2 form segregated irrequidistant columns stacks along the crystallographic c-axis direction. It is worth noting that there existed charge assisted C–H···N interactions between the adjacent anion and cation stacks in crystal of 1 and 2. DSC measurement of 1 and 2 exhibited two exothermic peaks in the first and second cooling process, and showed supercooling behavior and the thermal hysteresis of 18 and 50 K were observed for 1 and 2, respectively. Furthermore, 1 exhibits cold crystallization around 342 K during the second heating scan. Compound 1 shows the magnetic characteristics of a low-dimension antiferromagnetic coupling spin system in the high temperature and spin gap in the low-temperature phase, and compound 2 exhibits weak paramagnetism over the temperature range of 2–400 K.

Graphical Abstract

Compound 1 shows the magnetic characteristics of spin gap in the low-temperature phase and 2 exhibits weak paramagnetism over the temperature range of 2–400 K.

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Acknowledgments

We thank the National Postdoctoral Foundation, Postdoctoral Science Foundation of Jiangsu Province, National Science Foundation of High Learning Institutions of Jiangsu Province and Nature Science Foundation of China for financial support (Grant No. 20110491403, 1002020B, 11KJD150004, 21201103 and 21171097).

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Authors and Affiliations

  1. School of Biochemical and Environmental Engineering, Nanjing Xiaozhuang University, Nanjing, 211171, People’s Republic of China

    Hong Zhou, Hai-Bao Duan & Shan-Shan Yu

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  1. Hong Zhou
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  2. Hai-Bao Duan
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  3. Shan-Shan Yu
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Correspondence to Hai-Bao Duan.

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Zhou, H., Duan, HB. & Yu, SS. The Long-Chain N-Alkylpyridinium Cation Modulate Magnetic Behaviors of Metal-bis-1,2-dithiolene Compounds. J Chem Crystallogr 43, 250–257 (2013). https://doi.org/10.1007/s10870-013-0412-3

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