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Infrared studies of complexes between carboxylic acids and tertiary amines in argon matrices

Maria Wierzejewska-Hnat,  Zofia Mielke  and  Henryk Ratajczak 

Abstract

The infrared spectra of the complexes formed between acetic and trifluoroacetic acids and tertiary amines [N(CH3)3, N(C2H5)3] in argon matrices and for two-component solid mixtures of acid and amine have been recorded. The spectra show that both 1 : 1 and 2 : 1 complexes of acetic acid and amine isolated in argon matrices have molecular forms characterized by broad vOH absorption at ≈ 2000 cm–1. In an acidic environment in both highly concentrated argon matrices and in two-component solid mixtures the proton transfer form CH3CO–2⋯H+NR3 was identified. The 2 : 1 complexes of trifluoroacetic acid and amine isolated in argon matrices have an ionic form as identified by the appearance of characteristic carboxylate group absorption. The spectra also suggest that the 1 : 1 complex forms an ion pair in an argon matrix but this is not conclusive.

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Article type: Paper
DOI: 10.1039/F29807600834
Citation: J. Chem. Soc., Faraday Trans. 2, 1980,76, 834-843
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    Infrared studies of complexes between carboxylic acids and tertiary amines in argon matrices

    M. Wierzejewska-Hnat, Z. Mielke and H. Ratajczak, J. Chem. Soc., Faraday Trans. 2, 1980, 76, 834
    DOI: 10.1039/F29807600834

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