Electronic spectrum and photoreactivity of dichloro(1,5-cyclooctadiene)-palladium(II)

Add time:07/29/2019    Source:sciencedirect.com

The complex PdII(1,5-COD)Cl2 (1,5-COD=1,5-cyclooctadiene) shows a long-wavelength ligand-to-metal charge transfer (LMCT) absorption at λmax=342 nm. It is suggested that LMCT excitation generates a COD radical cation and PdICl2− in the primary photochemical step. In acetonitrile, a back-electron transfer takes place that leads to the transformation of 1,5-COD to its 1,3-isomer and a solvated Pd(II) complex. In ethanol, the COD radical cation and PdI are reduced by the solvent, which is oxidized to acetaldehyde. Metallic palladium is formed as a colloid.

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