A Bis(maleonitriledithiolato)nickelate Ion-Pair Compound Exhibiting Dielectric Anomaly and Relaxation

作者：Duan Hai Bao^*; Yu Shan Shan; Zhou Hong

来源：Chinese Journal of Inorganic Chemistry, 2014, 30(12): 2872-2878.

• Metal-bis-dithiolene complex
• dielectric anomaly
• dielectric relaxation
• crystal structure

An ion-pair compound, 1,7-bis(1-methylimidazolium)heptane bis(maleonitriodithiolato)nickelate (1), was synthesized and single crystal structurally characterized. The his (maleonitriodithiolato)nickelate anions and dication formed the wave-shape anion chain along c-axis direction, respectively. 1 undergoes a tunable transition at about 90 degrees C between high and low dielectric states at variable temperature, which probably arises from the order-to-disorder transformation of alkyl chains. The dielectric relaxation process in low-frequency region, attributed to the orientation polarization of the molecules dipoles, was observed and discussed. Furthermore, 1 exhibits cold crystallization.around. 66 degrees C and 130 degrees C during the second heating scan, and originated from fast cooling rate and the large viscosity. Such study provides a possible strategy to explore switchable dielectric material. CCDC: 1015809.

• 出版日期2014-12-10
• 单位南京晓庄学院