Fourier transform infrared spectrometry, carbon-13 nuclear magnetic resonance spectrometry, and photoacoustic spectroscopy of a silica-immobilized ligand

Infrared spectometry, ultraviolet absorbance spectrometry, photoacoustic spectroscopy, and solid-state 13C NMR spectrometry have in combination produced useful information about an immobilized acetoacetamide. The immobilized acetoacetamide formed by reacting diketene with either aminopropylsilane or (aminoethyl)aminopropylsilane bound to silica gel is strongly hydrogen bonded and largely in the keto form. The keto form can be converted to the enolate ion only in very alkaline conditions. In weakly acidic solutions the keto form complexes with several metal ions