Chemical shifts and spin-spin couplings of the metal nuclei with the carbon ¹³C nuclei in the ligand in mercury and cadmium bisheteroarylformazanates

Abstract

The bis-5-(2-heteroaryl)formazanates of mercury and cadmium ML₂ (where L = 5-quinoxalyl- or 5-benzothiazolylformazanate), having a pseudooctahedral structure, were studied by¹³C, ¹⁹⁹Hg, and ^113,111Cd NMR methods. The ¹⁹⁹Hg and ^113,111Cd NMR chemical shifts and also the spin-spin coupling constants of these nuclei with the ¹³C nuclei of the ligands were measured. The results of the experiments indicate π-conjugation 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. The ¹⁹⁹Hg and^111,113Cd chemical shifts were also measured for the respective mercury and cadmium complexes.

How to Cite
Kessenikh, A.V., Shmelev, L.V. Chem. Heterocycl. Compd. 1995, 31, 1122. [Khim. Geterotsikl. Soedin. 1995, 1280.]

For this article in the English edition, see DOI https://doi.org/10.1007/BF01165060