| As the basic components of the electrical and electronic industries,dielectric materials attract a lot attention of scholars in many fields.Dielectric materials with phase transition are considered to be as a kind of responsive dielectric material in which dielectric constant can be switched between high-and low-dielectric states under the stimulation of external conditions（such as electricity,magnetic,optical,thermal etc.）.The excellent features making them attractive for temperature sensing,data storage,mechanical actuation,and energy harvesting.It is an urgent task to explore a new system of molecular-based responsive dielectric because of limited number and types.This paper is divided into the following three parts:The first part contains four molecular-based compounds based on the benzene ring-containing diamine which are:[C7N2H10][CdCl3]（compound1）,[C7N2H10][MnCl3]（compound 2）,[C7N2H10]2[CoCl4]（compound 3）and[C8N2H14]2[CdCl6]（compound 4）.The second part contains four molecular-based compounds based on the chain-type fattydiaminewhichare:[C5H16N2]4[Cd3Cl12][Cl]2[H2O]2（compound5）,[C7N2H20]3[MnCl3]2[MnCl4]2（compound 6）,[C7N2H20]3[CdCl3]2[CdCl4]2（compound 7）,[C7N2H20][SbCl5]（compound 8）.In the third part,there are four molecular-based compounds based on nitrogen-containing heterocyclic diamine and 2-chloro-N,N,N-trimethylethylamine chloride,respectively,which are[C7H14N2FCl][BF4]2（compound 9）,[C13N2H28]2[ZnCl4]2[H2O]3（compound10）,[C13N2H28]4[CdBr4]4[C2H5OH]2[H2O]3（compound 11）,[（CH3）3N（CH2）2Cl]2[ZnCl4]（compound12）.The properties of 12 substances,such as infrared spectroscopy（IR）,powder diffraction（PXRD）,single crystal diffraction,dielectric properties,etc,were measured.The relationship between dielectric constant/DSC and temperature further analyzes the potential for a phase transition.Among them,the dielectrics of compounds 9 and 12 showed reversible heterogeneous peaks during changing temperature,and their DSC curves showed obvious and reversible exothermic-endothermic peaks,confirming the reversible phase transition of compounds 9 and 12.Other compounds did not exhibit significant dielectric anomalies over the measurable temperature range,which were not what we want presumably. |
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