ELECTRONIC ABSORPTION SPECTRA AND STABILITY OF UNIFORM COMPLEXES.
Abstract
Based on examples with phthalocyanine and porphyrine, an investigation was made pertaining to the matter of type and shift of absorption bands in cyclic pi-ligands during the coordination of different metal ions. It was shown, that the shift of the first absorption band in the electronic spectrum of the pi-ligand depends not only upon the pi-bond strength, but is also a function of the type and strength (stability) of the sigma-bond; of the magnitude of central ion effective charge in the complex; and of the geometric distortion factor of the ligand pi-system during the coordination. All these electronic and structural factors differently influence, on one hand, the stability of the complex, and on the other the pi-ligand electronic levels. Therefore, the spectral criterion of complex stability with organic pi-ligands in the form, which is generally accepted (the larger the hypsochromic shift, the greater the complex stability), has a very limited application.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1966
- Accession Number
- AD0638669
Entities
People
- B. D. Beresin