✦ LIBER ✦

Thermodynamics, phase transitions and crystal structure of ammonium hexahalides: comparative study of the heat capacity and thermodynamic properties of (NH 4) 2PtCl 6, (ND4 ) 2PtCl 6, (NH 4)2 PtBr 6, (ND 4) 2PtBr6 , (NH 4) 2PdCl 6, (ND4 ) 2PdCl 6, (NH 4)2 TeCl 6, (ND 4) 2TeCl6 , and (NH 4) 2RuCl 6from 5 K to 350 K

✍ Scribed by Ron D. Weir; Edgar F. Westrum; Jr

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 880 KB
Volume: 34
Category: Article
ISSN: 0021-9614
DOI: 10.1006/jcht.2001.0910

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✦ Synopsis

The results from recent measurements of heat capacity, crystal structure and related properties as well as thermodynamic properties of 27 members of the hexahalogenated metal salts to include the alkali, ammoniated and deuterated forms are compared over a wide range of temperature. A detailed comparison is provided for the pairs (NH 4 ) 2 PtCl 6 , (ND 4 ) 2 PtCl 6 ; (NH 4 ) 2 PtBr 6 , (ND 4 ) 2 PtBr 6 ; (NH 4 ) 2 PdCl 6 , (ND 4 ) 2 PdCl 6 ; (NH 4 ) 2 TeCl 6 , (ND 4 ) 2 TeCl 6 ; and (NH 4 ) 2 RuCl 6 from 5 K to 350 K. A discussion is summarised that includes the known roles played by the cations and anions inducing structural phase transitions. The preliminary results for heat capacity measurements of (NH 4 ) 2 RuCl 6 are reported for the first time.

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