2 H quadrupole resonance frequencies have been detected in partially deuterated H2SeO3, HIO3, B(OH)3, Te(OH)6, KHSO4, NaHCO3 and KHCO3 using double resonance by level crossing (d.r.l.c.) techniques. Te(OH)6 shows a complex multiplet which has been tentatively assigned using a combination of Zeeman measurements, double irradiation and double quantum methods. The quadrupole coupling constants have been correlated with the H … O hydrogen bond lengths derived from neutron diffraction data, and deviations are attributed to differences in π-bonding to the oxygen atom.