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The self-association of dicyclohexylarsinic acid and dicyclohexyldihydroxychloroarsane in chloroform at 37°

Authors
Journal
Journal of Inorganic and Nuclear Chemistry
0022-1902
Publisher
Elsevier
Publication Date
Volume
41
Issue
9
Identifiers
DOI: 10.1016/0022-1902(79)80052-4

Abstract

Abstract Molecular mass determinations on dicyclohexylarsinic acid (HDCAA) and dicyclohexyldihydroxychloroarsane (HDCAA·HCl) in chloroform solutions by vapor pressure osmometry at 37° indicated that the compounds were not present as monomers. Various models were tested to describe the observed self-associations. For HDCAA a monomer-dimer association with an equilibrium constant K 1,2 = 1.60 kg/g and a second virial coefficient BM 1 = 1.22 × 10 −3 kg/g described the association best. The HDCAA·HCl data agreed best with a model of a sequential indefinite self-association with k = 5.51 + 10 −2 kg/g and BM 1 = 1.40 × 10 −1 kg/g.

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