The vibrational spectra of the halides and complex halides of arsenic(III). Part II. The tetrachloroarsenate(III) and tetrabromoarsenate(III) anions

Abstract

The Raman and infrared spectra (90–500 cm.^–1) of the di-n-butyl ether extract of a solution of As(III) in hydrochloride acid indicate that the extract contains the AsCl₄^– anion, of point-group C_2v, and a partial assignment of the observed frequencies is proposed. No definite conclusion can be reached about the nature of the species present in the extract of the solution of arsenic tribromide in hydrobromic acid. The anions AsBr₃Cl^– and AsCl₃Br^– do not exist in the extracts of the solutions of arsenic trichloride in hydrobromic acid and of arsenic tribromide in hydrochloric acid.