Nuclear Quadrupole Resonance of Nitrogen-14 in Potassium Hexathiocyanatoplatinate(IV) and Tetrathiocyanatomercurate(II)
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چکیده
The nuclear quadrupole resonance of 14N was observed in KoPt(SCN)6 and K2Hg(SCN)4 at various temperatures. Both compounds yield large asymmetry parameters indicating the existence of asymmetric ^-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.
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