Effect of diquaternary ammonium bromides on proton spin-lattice relaxation times in water

Abstract

Experimental results are reported for the spin-lattice relaxation times and chemical shifts of ¹H nuclei of water molecules in solutions of two diquaternary ammonium bromides. In addition, measurements have been made in H₂O + D₂O mixtures and these are used to separate out the contribution of the solute protons to the total relaxation rate change of the water protons. The effect of CH₂ groups appears to be to produce some structure breaking.