The structure and dielectric properties of ionic compounds with flexible ammonium moiety  

作　　者：Hui-Ting Wang Li-Hui Kong Ping-Ping Shi Qiang Li Qiong Ye Da-Wei Fu 

机构地区：[1]Ordered Matter Science Research Center,Southeast University

出　　处：《Chinese Chemical Letters》2015年第3期382-386,共5页中国化学快报（英文版）

基　　金：supported by the Project 973 (No.2014CB848800);National Natural Science Foundation of China (Nos.21471032,21422101 and 21301029);Jiangsu Province NSF (Nos.BK20140056 and BK20130600);Program for NCET;Ph.D.Programs Foundation of Ministry of Education of China (No.20130092120013)

摘　　要：The 3-morpholin-4-yl-propyl-ammine tetrafluoroborate（MPA^＋）（BF4^-）（1） and the 3-morpholin-4-ylpropyl-ammine perchlorate（MPA^＋）（ClO4^-）（2） were synthesized and separated as colorless block crystal.The（MPA^＋）（BF4^-） undergoes a reversible phase transition at ca.347.3 K with a hysteresis of16.1 K.Dielectric measurement also can confirm the transition.The crystal structure determined at300 K（monoclinic,P21/c,a = 9.978（2）A,b = 7.5206（15）A,c = 15.058（3）A,b = 96.99（3）8,v = 1121.6（4）A^3,z = 4） and 373 K（triclinic,P-1,a = 10.021（7）A,b = 7.662（3）A,c = 7.920（4）A,a = 95.012（14）8,b = 101.67（4）8,g = 91.48（3）8,v = 592.7（6）A^3,z = 2） reveal that this compound has two phase.The most distinct is the BF4^- anion is disorder at 373 K,which is probably the driving force of the phase transition.DSC measurement,dielectric measurement and the crystal structure of the compound 2 did not change at 300 K and 100 K.The 3-morpholin-4-yl-propyl-ammine tetrafluoroborate（MPA^＋）（BF4^-）（1） and the 3-morpholin-4-ylpropyl-ammine perchlorate（MPA^＋）（ClO4^-）（2） were synthesized and separated as colorless block crystal.The（MPA^＋）（BF4^-） undergoes a reversible phase transition at ca.347.3 K with a hysteresis of16.1 K.Dielectric measurement also can confirm the transition.The crystal structure determined at300 K（monoclinic,P21/c,a = 9.978（2）A,b = 7.5206（15）A,c = 15.058（3）A,b = 96.99（3）8,v = 1121.6（4）A^3,z = 4） and 373 K（triclinic,P-1,a = 10.021（7）A,b = 7.662（3）A,c = 7.920（4）A,a = 95.012（14）8,b = 101.67（4）8,g = 91.48（3）8,v = 592.7（6）A^3,z = 2） reveal that this compound has two phase.The most distinct is the BF4^- anion is disorder at 373 K,which is probably the driving force of the phase transition.DSC measurement,dielectric measurement and the crystal structure of the compound 2 did not change at 300 K and 100 K.

关 键 词：moiety ionic dielectric triclinic reversible monoclinic propyl ammonium anion cyclohexane 

分 类 号：O626[理学—有机化学]