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Dielectric Phase Transition Behavior in an N-salicyliden Based Ion Crystal

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Abstract

A new Schiff base iodides with a formula of [o-OH-Bz-1-APy]I have been synthesized and characterized structurally (o-OH-Bz-1-APy+ = ortho-hydroxy-benzylidene-1-aminopyridinium Schiff base derivative (1)). Two adjacent cations adopt an antiparallel arrangement forming π-type cation dimmer, along the a-axis direction, the cation dimmer formed irregular cation stacks and counterion I− anions are embedded in the cation stacks in the crystals of 1. A strong frequency dispersion of ε’ is observed in the low frequency region and can be attributed to local dipole motion in 1. Furthermore, this ion-pair compound shows novel dielectric phase transition around 125 °C. DSC measurement of 1 exhibited gradual endothermic peak around the transition temperature and small enthalpy change means that the difference in lattice energy between the two phases is very small. This study provided a new strategy for the design of dielectric phase transition system.

Graphical Abstract

Compound 1 shows a strong frequency dispersion of dielectric loss in the low frequency region and novel dielectric phase transition.

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Acknowledgments

The authors thank National Nature Science Foundation of China and Natural Science Foundation of High Learning Institutions of Anhui Province for their financial support (Grant nos: 21201103, 21301093 and KJ2012ZD11).

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Authors and Affiliations

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

    Shan-Shan Yu, Hui Zhang & Hai-Bao Duan

  2. School of Chemical and Engineering, Anhui Huangshan University, Anhui, 245021, People’s Republic of China

    Hui Zhang

Authors
  1. Shan-Shan Yu
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  2. Hui Zhang
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Correspondence to Hai-Bao Duan.

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Yu, SS., Zhang, H. & Duan, HB. Dielectric Phase Transition Behavior in an N-salicyliden Based Ion Crystal. J Chem Crystallogr 44, 415–420 (2014). https://doi.org/10.1007/s10870-014-0531-5

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  • DOI: https://doi.org/10.1007/s10870-014-0531-5

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