Studies on Coördination Compounds. XIV. The Determination of Enthalpy and Entropy Values for Several Bivalent Metal Ions and Cerium(III) with the Acetylacetonate Ion

Journal Article · 28 February 1955 · Journal of Physical Chemistry

DOI: https://doi.org/10.1021/j150525a010 · OSTI ID:4397840

Izatt, Reed M. ^[1]; Fernelius, W. Conard ^[1]; Block, B. P. ^[1]

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1. Pennsylvania State Univ., University Park, PA (United States)

Thermodynamic stepwise equilibrium formation constants are given for the reaction in aqueous solution of the acetylacetonate ion with Cu²⁺, Be²⁺, UO₂²⁺, Ni²⁺, Co²⁺, Zn²⁺, Mn²⁺, Cd²⁺, Mg²⁺ and Ce³⁺ at 10, 20 and 40°. Constants at 30° have been given in previous publications. Values of the thermodynamic quantities, ΔH, ΔS and ΔF are given over the temperature range 10 to 40° for the formation of the first complex, MCh^(n-1)+, in each case (except UO₂²⁺), of MCh₂^(n-2)+ in each case (except Zn²⁺ and Cd²⁺), and of MCh₃- in the case of Ni²⁺. Values for these thermodynamic quantities are also given for the dissociation of acetylacetone over the above temperature range. The significance of the values obtained is discussed in the light of the reactions involved. Comparisons are made with other thermodynamic values in the literature involving several of these same ions with other ligand types.

• Research Organization: Pennsylvania State Univ., University Park, PA (United States)
• Sponsoring Organization: US Atomic Energy Commission (AEC)
• NSA Number: NSA-09-003390
• OSTI ID: 4397840
• Report Number(s): NYO--6589; 0022-3654
• Journal Information: Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 3 Vol. 59; ISSN 0022-3654
• Publisher: American Chemical SocietyCopyright Statement
• Country of Publication: United States
• Language: English