Thermodynamic properties of tetraphenylphosphonium perchlorate and tetraphenylarsonium perchlorate from T → 0 to T = 340 K

B.V. Lebedev; N.N. Smirnova; L.Y. Tsvetkova; Y. Marcus; G. Hefter

doi:10.1006/jcht.2000.0757

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Thermodynamic properties of tetraphenylphosphonium perchlorate and tetraphenylarsonium perchlorate from T → 0 to T = 340 K

Journal article

Peer reviewed

Thermodynamic properties of tetraphenylphosphonium perchlorate and tetraphenylarsonium perchlorate from T → 0 to T = 340 K

B.V. Lebedev, N.N. Smirnova, L.Y. Tsvetkova, Y. Marcus and G. Hefter

Journal of Chemical Thermodynamics, Vol.33(5), pp.485-498

2001

DOI: https://doi.org/10.1006/jcht.2000.0757

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Abstract

The temperature dependence of the standard molar heat capacity Cp,mo of samples of crystalline tetraphenylphosphonium perchlorate and tetraphenylarsonium perchlorate was measured in an adiabatic low-pressure calorimeter between T = 4.8 K and T = 340 K and from T = 5.8 K to T = 340 K, respectively, mostly to within a precision of 0.2 per cent. For tetraphenylphosphonium perchlorate, an anomalous change of the heat capacity in the range T = 125 K to T = 185 K, probably arising from the excitation of hindered rotations of atomic groups, was found and its thermodynamic characteristics were determined. No such anomaly was observed for tetraphenylarsonium perchlorate. The data obtained were used to calculate the thermodynamic functions Cp,mo(T)/R, Δ0THmo/R·K, Δ0TSmo/R, and φmo = Δ0TSmo - Δ0THmo/T (where R is the universal gas constant) of the compounds T → 0 and T = 340 K.

Details

Title: Thermodynamic properties of tetraphenylphosphonium perchlorate and tetraphenylarsonium perchlorate from T → 0 to T = 340 K
Authors/Creators: B.V. Lebedev (Author/Creator) - Saratov State University
N.N. Smirnova (Author/Creator) - Saratov State University
L.Y. Tsvetkova (Author/Creator) - Saratov State University
Y. Marcus (Author/Creator) - Hebrew University of Jerusalem
G. Hefter (Author/Creator) - Murdoch University
Publication Details: Journal of Chemical Thermodynamics, Vol.33(5), pp.485-498
Publisher: Academic Press
Identifiers: 991005541349007891
Murdoch Affiliation: School of Chemical and Mathematical Science
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 2 Chemistry; 2.89 Ionic, Molecular & Complex Liquids; 2.89.462 Excess Molar Volumes
Web Of Science research areas: Chemistry, Physical; Thermodynamics
ESI research areas: Chemistry