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Polybrominated HBr-donors were irradiated with UV light of the wavelength λ = 257 nm and 290 nm in methanolic solution and methanolic spiropyran solution. The quantum efficiency of the generation of HBr has been determined and discussed. With spiropyran present in the irradiated solutions the results can be explained only by the assumption of an energy transfer process between spiropyran and HBr-donors.

HBr-Quantenausbeute von mehrfach bromierten organischen Verbindungen in Methanol / HBr Quantum Efficiency of Brominated Organic Compounds in Methanol