Structural characterization, spectroscopic properties and phase transition in 4-aminopyridinium tetrachlorogallate(III): [4-NH2PyH][GaCl4]

被引：20

作者：

Szklarz, P. ^{[1
]}

Jakubas, R. ^{[1
]}

Bator, G. ^{[1
]}

Lis, T. ^{[1
]}

Kinzhybalo, V. ^{[1
]}

Baran, J. ^{[2
]}

机构：

[1] Univ Wroclaw, Fac Chem, PL-50383 Wroclaw, Poland

[2] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50950 Wroclaw, Poland

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2007年 / 68卷 / 12期

关键词：

infrared spectroscopy; X-ray diffraction; crystal structure; dielectric properties; phase transition;

D O I：

10.1016/j.jpcs.2007.06.022

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Crystal structures of [4-NH2C5H4NH][GaCl4] ([4-NH2PyH][GaCl4]) have been determined at 80 and 120 K by single crystal X-ray diffraction (trigonal space groups R3 and R3m, respectively). DSC studies indicate a presence of one reversible phase transition close to the second order at 110 K with Delta S approximate to 1 J mol(-1) K-1. Infrared spectra of polycrystalline [4-NH2PyH][GaCl4] have been studied in the temperature range between 10 and 300 K. Substantial changes in the temperature evolution of internal modes of the 4-aminopyridinium cations are due to the freezing of the 4-aminopyridinium cations below 110 K. Dielectric investigations reveal three independent, well separated relaxation processes in temperature range between 90 and 300 K. Parameters of the relaxation processes have been estimated. (c) 2007 Elsevier Ltd. All rights reserved.

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收藏

页码：2303 / 2316

页数：14

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