17O and 2H quadrupole double resonance in potassium hydrogen maleate and related compounds

Abstract

² H, ¹⁷O, ³⁹K and ^85,87Rb quadrupole resonance signals have been recorded in potassium and rubidium hydrogen maleates and several related compounds by double resonance methods. The ¹⁷O signals were detected in natural abundance by a novel technique of high sensitivity based on the “solid effect” and thermal mixing. The symmetric hydrogen bonds in potassium hydrogen maleate and chloromaleate are shown to have characteristic values of the ¹⁷O and ²H quadrupole coupling constants which can be used to identify this kind of bonding in other related compounds. The orientation of the quadrupole tensor within the bonding system is also discussed.