The Dielectric Properties Of Nitrogen Containing Heterocyclic Compounds And Crown Ether Inclusions

Phase transition materials are attributable to their phase transition accompanying dielectric and thermal anomalies.Hybrid organic-inorganic materials have been already listed to the phase transition research not only owing to their diverse structures,but also due to their improved or unusual features.Based on the above,we have designed and synthesized a range of novel hybrid organic-inorganic compounds based on heterocyclic amines,and investigated the phase transitions through crystal structure analyses and dielectric properties.The main body is divided into two portions.The one portion is six piperidine derivatives based hybrid organic-inorganic compounds(C₆H₁₄N)CdCl₃?1?,(C₅H₁₄N₂)₂(Cd₃Cl₁₀H₂O)H₂O?2?,(C₅H₁₃N₂)CdCl₃?3?,(C₅H₁₂NO)₄Cd₃Cl₁₀?H₂O?₂?4?,(C₅H₁₃N₂)CuCl₄?5?and(C₆H₁₄N)₂CuCl₄?6?were synthesized.The other portion is sixcrownetherbasedhybridorganic-inorganiccompounds(C₁₂H₂₄O₆)(C₆H₁₆N₂)CuCl₄?7?,(C₁₂H₂₄O₆)(C₆H₁₆N₂)CuBr₄?8?,(C₁₂H₂₄O₆)(C₆H₁₆N₂)CdCl₄?9?,(C₁₂H₂₄O₆)(C₆H₁₆N₂)MnCl₄?10?,(C₁₂H₂₄O₆)(C₆H₁₆N₂)CuCl₄?11?and(C₁₂H₂₄O₆)(C₆H₁₆N₂)CdCl₄?12?were synthesized.Experimental results demonstrate that 1 undergoes a dielectric anomaly at 360 K.The structure analyses in 1 show that the phase transition is mainly attributed to the order-disorder change of cations.7 exhibits a step-like dielectric anomaly at about 300 K.The crystal structure and DSC measurements in 7 are further confirmed the existence of the phase transition.The structural phase transition in 7 is mainly due to the order-disorder transition of the crown ethers.Other compounds in the heating and cooling process show no reversible dielectric anomalies,which means that these compounds have no structural phase transitions in the measured temperature range.