Some features of the interaction of silica gel with organic bases

The acid groups attached to a silica gel surface were calorimetrically and chromatographically titrated by N, N-dimethylformamide; N, N-dimethylacetamide; pyridine; methanol; acetone, and acetonitrile in 1,2-dichloroethane. The chromatographic titration furnished the number of moles of solute which...

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Bibliographic Details
Published in:Thermochimica acta 1986-08, Vol.104, p.111-119
Main Authors: Airoldi, Claudio, Santos, Luiz S.
Format: Article
Language:English
Subjects:
Adsorbents
Chemistry
Exact sciences and technology
General and physical chemistry
Surface physical chemistry
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Summary:The acid groups attached to a silica gel surface were calorimetrically and chromatographically titrated by N, N-dimethylformamide; N, N-dimethylacetamide; pyridine; methanol; acetone, and acetonitrile in 1,2-dichloroethane. The chromatographic titration furnished the number of moles of solute which reacted with the silanol groups. From the net isotherm fitted to a modified Langmuir equation, the variation of enthalpy and the equilibrium distribution constant of the hydrogen bonding were calculated. The results correlated with the donor number of the bases. The following order of the interaction in forming hydrogen bonding was established: pyridine > N, N-dimethylacetamide > N, N-dimethylformamide > acetone > acetonitrile.
ISSN:0040-6031
1872-762X
DOI:10.1016/0040-6031(86)85189-9