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The nuclear quadrupole resonance of  14 N was observed in K 2 Pt(SCN) 6  and K 2 Hg(SCN) 4  at various temperatures. Both compounds yield large asymmetry parameters indicating the existence of asymmetric π-electron distribution about a CN bond axis. The ionic character of metal-ligand bonds in the platinum and mercury complexes is estimated to be 28% and 58%, respectively. The temperature dependence of each component of quadrupole coupling can practically be interpreted in terms of a simple Bayer theory. Both complexes show the quadrupole coupling constant versus temperature curve faintly convex to the abscissa. This anomaly is attributable to vibronic interaction in a thiocyanate group

Nuclear Quadrupole Resonance of Nitrogen-14 in Potassium Hexathiocyanatoplatinate(IV) and Tetrathiocyanatomercurate(II)