Knör, Günther and Leirer, Markus and Vogler, Arnd (1998) Spectroscopic properties and photoreactivity of rhenium (I) acenaphthenequinone diimine complexes. JOURNAL OF INFORMATION RECORDING, 24 (1-2). pp. 69-73. ISSN 1025-6008
Full text not available from this repository.Abstract
We have synthesized the novel organometallic rhenium (I) complex fac-[ReCl(CO)(3)(BIAN)] using the bidentate nitrogen ligand BIAN = bis (phenylimino) acenaphthene. The electronic spectrum of the intensely coloured compound is dominated by a low-energy optical charge transfer from the d(6) metal fragment to the pi-accepting quinodiimine subunit. The absorption maximum of this metal-to-ligand charge transfer (MLCT) band exhibits a pronounced red-shift with decreasing solvent polarity (negative solvatochromism). The compound is non-luminescent at room temperature in solution and at 77 K in rigid matrix. This behaviour is ascribed to an enhanced radiationless decay rate of the lowest MLCT excited state according to the energy gap law. Upon monochromatic irradiation in the ultraviolet spectral region, fac-[ReCl(CO)(3) (BIAN)] undergoes an irreversible wavelength-dependent photolysis with a quantum yield maximum of phi = 3 x 10(-3) at lambda(irr) = 280 nm. The characteristics of the photoproduct formed during UV irradiation in acetonitrile are consistent with a photoinduced ejection of the chloride ligand and substitution by a solvent molecule.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CARBON-DIOXIDE; REDUCTION; rhenium complexes; diimine ligands; MLCT; solvatochromism; photophysics; photochemistry |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Alumni or Retired Professors > Prof. Dr. Arnd Vogler |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 01 Mar 2023 09:09 |
| Last Modified: | 01 Mar 2023 09:09 |
| URI: | https://pred.uni-regensburg.de/id/eprint/50243 |
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