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Excited State Behavior of Uranyl Complexes with Salophen and Oxine as Chromophoric Ligands
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Horst Kunkely
Published/Copyright:
June 2, 2014
Abstract
The electronic spectra and the photochemistry of the uranyl complexes UO2 (salophen) and UO2 (oxinate)2 with 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 ϕ = 3.6 x 10-3 at λirr = 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.
Received: 2001-6-28
Published Online: 2014-6-2
Published in Print: 2002-3-1
© 1946 – 2014: Verlag der Zeitschrift für Naturforschung
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- Cationic Ruthenium-Sulfine Complexes: Synthesis and Dynamic Behaviour
- Palladium-Cadmium Ordering In Repdcd (Re = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb) And Comparison With Isotypic Indium Compounds
- Metallkomplexe mit biologisch wichtigen Liganden, CXLXXX [1]. Kationische Bis(α-Aminosäuremethylester)-N,O-Chelatkomplexe von Palladium(II) [Pd(NH2CHRCO2Me)2]2+(BF4–)2/ Metal Complexes of Biologically Important Ligands, CXLXXX [1]. Cationic Bis(α-Amino Acid Methylester)-N,O-Chelate Complexes of Palladium(II) [(Pd(NH2CHRCO2Me)2]2+(BF4–)2
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