Michael John

1 Introduction Among the group 12 elements (M = Zn, Cd, Hg), t+he M(I)–M(I) structural entity with a covalent bond has long been known for the heavier congeners, cadmium and mercury.

Most stable isotopes have a nuclear spin > 1/2, but the quadrupole interaction poses challenge on their detection by nuclear magnetic resonance (NMR). On the other hand, the quadrupole interaction is a rich source of structural information that may be exploited for solution NMR in the form of residual quadrupolar couplings (RQCs) of weakly oriented samples.

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