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Improvements in estimated entropies and related thermodynamic data for aqueous metal ions

Johnson, David A. and Nelson, Peter G. (2012). Improvements in estimated entropies and related thermodynamic data for aqueous metal ions. Inorganic Chemistry, 51(11) pp. 6116–6128.

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New estimated standard entropies for some aqueous metal ions are obtained by taking account of magnetic and symmetry contributions. By combining them with an analysis of literature data, improved experimental and estimated values are derived for the standard enthalpies and Gibbs energies of formation of the aqueous ions of titanium, vanadium, chromium, manganese, cerium and praseodymium. Separate entropy correlations are used for each primary coordination number and the size dependence is represented by the reciprocal of the metal-oxygen distance in that coordination. The new scheme is consistent with recent work on the coordination of Hg2+(aq), Pb2+(aq) and tripositive rare earth ions. It differs from its predecessors in indicating a larger variation of the standard molar entropies of aqueous ions with coordination number. The value of SƟ(Be2+, aq) is discussed in this context.

Item Type: Journal Article
Copyright Holders: 2012 American Chemical Society
ISSN: 0020-1669
Keywords: aqueous ions; standard molar entropies; enthalpies of formation; hydration numbers; symmetry number; titanium; vanadium; chromium; manganese; lanthanides
Academic Unit/Department: Science > Life, Health and Chemical Sciences
Item ID: 35620
Depositing User: David Johnson
Date Deposited: 12 Nov 2012 16:56
Last Modified: 26 Feb 2016 03:50
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