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Excited State Behavior of Uranyl Complexes with Salophen and Oxine as Chromophoric Ligands

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Excited State Behavior of Uranyl Complexes with Salophen and Oxine as Chromophoric Ligands

Horst Kunkely and Arnd Vogler

Institut f¨ur Anorganische Chemie, Universit¨at Regensburg, D-93040 Regensburg, Germany Reprint requests to Prof. Dr. A. Vogler. E-mail: Arnd.Vogler@chemie.uni-regensburg.de Z. Naturforsch.57 b,301–304 (2002); received June 28, 2001

Uranyl Complexes, Salen Complexes, Oxinate Complexes

The electronic spectra and the photochemistry of the uranyl complexes UO2(salophen) and UO2(oxinate)2with H2salophen = N,N'-bis(salicylidene)-o-phenylenediamine and oxine = 8- hydroxyquinoline were studied. The excited state behavior of both complexes is determined by a low-energy salophen2 / oxinate to U(VI) ligand-to-metal charge transfer (LMCT) state which is not luminescent but can be reactive. In the case of UO2 (oxinate)2 the photolysis leads to the formation of free oxine with= 3.610 3at irr = 366 nm in CHCl3. It is suggested that various redox processes with the participation of the solvent are involved in product formation. UO2(salophen) is not light sensitive since the primary electron transfer is followed by recombination which is facilitated by the rigid UO2(salophen) structure.

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