18301-86-5Relevant articles and documents
Infrared Spectrometric Studies of Cyanoalkyl Ligands Immobilized on Chromatographic Surfaces
Suffolk, B. R.,Gilpin, R. K.
, p. 596 - 601 (1985)
Long and intermediate chains of cyanoalkyl ligands were attached to porous silica-based material by using monoreactive chemistry, and short cyanoalkyl chains were attached by using mono-, di-, and trireactive chemistry.Subsequently, the microchemical structures of these materials were studied with Fourier transform infrared (FT-IR) techniques.In a nonpolar liquid (i.e., hexane) infrared spectra for the nitrile band were extremely broad and assymetrical.Deconvolution of these bands produced a doublet which suggested the presence of at least two different types of attached ligands.These bands support the idea of a certain population of nitrile groups which hydrogen bond with free surface silanol groups and a population of nitrile groups which sterically cannot hydrogen bond.This is possible by assuming a nonuniform distribution of groups.Groups bonded within a rich area or cluster would be restricted from surface interaction by surrounding groups or neighboring groups, whereas groups at the edges of such a cluster or groups bonded in sparcely populated areas could hydrogen bond.In a polar solvent (e.g., 1-butanol) the groups were displaced from the surface and showed ligand-solvent interaction.
