NMR relaxation studies and internal molecular rotation in liquid nitromethane

Abstract

Studies of the deuteron and proton relaxation rates of liquid nitromethane were made at various temperatures. The separation of the proton-proton intermolecular relaxation was accomplished by a dilution study in nitromethane- d 3. It was found that the spin-rotation interaction contribution is discussed in terms of different models for the spin-internal and spin-overall rotation coupling. The resulting spin-rotation relaxation times offer evidence for large spin-rotation effects due to the internal rotation of the methyl group.