Accession Number : AD0724768
Title : Inorganic Coordination Polymers. XI. A New Family of Chromium(III) Bis(phosphinate) Polymers, (Cr(OH)(OPRR'O)2)x.
Descriptive Note : Technical rept.,
Corporate Author : PENNWALT CORP KING OF PRUSSIA PA RESEARCH AND DEVELOPMENT DEPT
Personal Author(s) : Nannelli,Piero ; Gillman ,Hyman D. ; Peter,B.
Report Date : MAY 1971
Pagination or Media Count : 25
Abstract : Heating hydroxyaquochromium(III) bis(phosphinates) at temperatures up to 200C under vacuum yields the corresponding anhydrous polymers (Cr(OH)(OPRR'O)2)x. The infrared and visible spectra and solution properties lead to the following conclusions. When R and R' are phenyl groups, the hydroxyl groups appear to bridge between adjacent chromium atoms in the chain together with the phosphinate ligands to yield a linear, triple-bridged polymer. When at least one substituent on the phosphorus is an alkyl group, some of the hydroxyl groups crosslink between chains to yield less soluble polymers. Comparison of the properties of these new polymers with the parent polymers suggests that the latter should be formulated (Cr(H2O)n(OH)(OPRR'O)2)x:pH2O and that they contain more than one kind of monomer unit. The parent polymers can be readily prepared by a new method which involves reaction of a soluble chromium(III) salt with alkali metal phosphinates or of chromium(III) hydroxide with phosphinic acids in water-tetrahydrofuran mixture. (Author)
Descriptors : (*COMPLEX COMPOUNDS, INORGANIC POLYMERS), (*INORGANIC POLYMERS, *CHROMIUM COMPOUNDS), (*INFRARED SPECTRA, CHROMIUM COMPOUNDS), SYNTHESIS(CHEMISTRY), MOLECULAR STRUCTURE, PHOSPHORUS COMPOUNDS, POLYMERIZATION, ULTRAVIOLET SPECTRA, VISIBLE SPECTRA
Subject Categories : Polymer Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE