Combined NMR and UV/Vis Spectroscopy in the Solution State: Study of the Geometries of Strong OHO Hydrogen Bonds of Phenols with Carboxylic Acids

Abstract

A head of the game: A new probe head for simultaneous NMR and UV/Vis spectroscopic measurements is designed. 1H NMR and UV/Vis spectra of an intermolecular hydrogen-bonded complex (see scheme) are measured simultaneously in CD2Cl2 at 175 K. Aided by the 1H NMR spectra, the sample concentration can be adjusted so that the desired complex is the exclusive form of the phenol present. The UV/Vis spectra allow the approximate position of the bridging proton to be found.