Abstract
The bis-S-(2-heteroaryl)formazanates of mercury and cadmium ML2 (where L = S-quinoxalyl- or 5benzothiazolylformazanate), having a pseudooctahedral structure, were studied by13C199Hg, and113,111Cd NMR methods. The199Hg and113,111Cd NMR chemical shifts and also the spin-spin coupling constants of these nuclei with the13C nuclei of the ligands were measured. The results of the experiments indicate πconjugation in the metal chelate rings of the complexes, including the ring containing the atoms of the heterocycle, and also participation of the f orbitals of the mercury with various symmetry groups in the formation of a π-type MO, leading to different types of transmission of coupling through the various coordination points. The199Hg and111,113Cd chemical shifts were also measured for the respective mercury and cadmium complexes.
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