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Molecular weight studies of several organophosphorus acids

Authors
Journal
Journal of Inorganic and Nuclear Chemistry
0022-1902
Publisher
Elsevier
Publication Date
Volume
22
Identifiers
DOI: 10.1016/0022-1902(61)80445-4

Abstract

Abstract Molecular weight studies of several organophosphorus acids of the types (GO) 2PO(OH), (GO)G′PO(OH) and (GO)PO(OH) 2 have been made in several solvents, using an isothermal distillation method. In general, the monobasic acids are dimers in solvents such as n-hexane, cyclohexane, benzene and carbon tetrachloride; monomers in methyl alcohol; and intermediate in chloroform and acetone. Mono-(2-ethylhexyl)phosphoric acid is highly polymeric in n-hexane and cyclohexane, the molecular weight being 8–14·5 times the formula weight; hexameric in benzene and carbon tetrachloride; dimeric in acetone; and monomeric in methyl alcohol. The change in state of aggregation, for both the mono and dibasic acids, as the diluent is varied, parallels the predicted variation in solute-solvent interaction.

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