Crystal structure, DSC, IR and Raman studies in the compound NH₃(CH₂)₅NH₃HgCl₄

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• 作者：Khelifi ; Mabrouk ; Zouari ; Ridha ; Gargouri ; Mohamed ; Abdelhamid ; Ben Salah
• 刊名：Annales de Chimie Science des Materiaux
• 出版年：2002
• 出版时间：March - April, 2002
• 年：2002
• 卷：27
• 期：2
• 页码：37-46
• 全文大小：744 K

文摘

The penthylene-diammonium tetrachloromercurate (II) salt is triclinic centrosymmetric with the following unit cell dimensions: a= 7.7672(4)Å, b= 7.9754(6)Å, c= 10.9471(6)Å, α= 98.915(2)^o, β= 109.363(2)^o and γ= 91.463(2)^o with Z= 2. The structure consists of disordered penthylene-diammonium chains sandwiched between HgCl₆ octahedral layers. The chloromercurate sheet is packed as a result of hydrogen bonding to 1,5-penthylene diammonium ions. Ammonium groups at the ends of the chains fit into cavities of adjacent HgCl₄ layers and form N-H…Cl hydrogen bonds. Thermal analysis indicates a hysteresis phenomenon characteristic of a first order phase transition. The Raman and IR spectra of polycrystalline samples of NH₃(CH₂)₅NH₃HgCl₄ investigated at room temperature illustrate the conformational and statistical disorder of the organic chain. The system progressively gets ordered at low temperature, as the disorder of organic chains is due to a thermal effect.