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

来源 :Chinese Chemical Letters | 被引量 : 0次 | 上传用户:wanghuia23
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The 3-morpholin-4-yl-propyl-ammine tetrafluoroborate(MPA+)(BF4)(1) and the 3-morpholin-4-ylpropyl-ammine perchlorate(MPA+)(Cl O4)(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) ,b = 7.5206(15) ′,c = 15.058(3) ,b = 96.99(3)8,v = 1121.6(4)  3,z = 4) and 373 K(triclinic,P-1,a = 10.021(7) ,b = 7.662(3) ,c = 7.920(4) ,a = 95.012(14)8,b = 101.67(4)8,g = 91.48(3)8,v = 592.7(6) 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 + block crystal.The (MPA +) (BF4) undergoes a reversible phase transition at ca. 347.3 K with a hysteresis of 16.1 K. Dielectric measurement also can confirm the transition. The crystal structure determined at 300 K (monoclinic, P21 / c, a = 9.978 (2) , b = 7.5206 (15)  ’, c = 15.058 (3) , b = 96.99 (3) 8, v = 1121.6 (4)  3, z = 4) and 373 K (triclinic A = 10.021 (7) , b = 7.662 (3) , c = 7.920 (4) , a = 95.012 (14) 8, b = 101.67 (4) 8, g = 91.48 ) 8, v = 592.7 (6) 3, z = 2) reveals 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.
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