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Four- and Six-Coordinate Cobalt(II) Dioctylphosphinate.
PENNWALT CORP KING OF PRUSSIA PA RESEARCH AND DEVELOPMENT DEPT
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A new form of cobaltII dioctylphosphinate form II was prepared by the reaction of cobaltII chloride with dioctylphosphinic acid in absolute ethanol. Visible and near infrared spectra indicate that form II contains octahedrally coordinated cobaltII, whereas the previously reported form form I contains tetrahedrally coordinated cobaltII. Form II is irreversibly converted to form I by heating above 68C or by dissolving it in nonpolar solvents. Infrared spectra, X-ray powder patterns, and DSC thermograms for both forms are presented and compared. This appears to be the first example of a polymetal phosphinate which exists both in four- and six-coordinate forms. Author
APPROVED FOR PUBLIC RELEASE