Studies on the stability of four-membered ring chelates Part V. The stability of dialkyl dithiocarbamate chelates

摘要

This paper systematically studies the structure and the internal mechanism of the stability of. sulphur-coordinated four-membeied rings in chelates of diaikyl dithiocarbamate. It was found that the conjugated π electron structure of the free ligand is II_4~6, while in the metal chelate it is II_4~4. The stable chelates have strong σ and π-coordinated bonds. The actual strain of the sulphur-coordinated four-membered ring in chelates is not as strong as assumed. It mainly depends on the atomic radius of the metal. The stronger the electronegatixity of the metal, the stronger the π-coordinated bond. The stabler the four-membered ring, the weaker the intensity of the C-S vibrational band.