Studies on the stability of four-membered ring chelates Part V. The stability of dialkyl dithiocarbamate chelates |
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Authors: | Yuehui Yang Bencheng Zuo Jingyin Li Guore Chen |
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Institution: | Department of Chemistry, Hebei University, Baoding 071002, People's Republic of China |
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Abstract: | This paper systematically studies the structure and the internal mechanism of the stability of sulphur-coordinated four-membered rings in chelates of dialkyl dithiocarbamate. It was found that the conjugated π electron structure of the free ligand is Π46, while in the metal chelate it is Π44. 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 electronegativity 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. |
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Keywords: | Dialkyl dithiocarbamates Four-membered chelate ring Stability Strain |
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