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The time evolution of electronically excited vitamin B 12 (cyanocobalamin) has been observed for the first time in the gas phase. It reveals an ultrafast decay to a state corresponding to metal excitation. This decay is interpreted as resulting from a ring to metal electron transfer. This opens the observation of the excited state of other complex biomimetic systems in the gas phase, the key...
The excited singlet-state lifetimes of the nucleic acid components adenine, adenosine and adenosine 5'-monophosphate, and also that of calf thymus DNA were determined from transient absorption measurements using a UV-laser flash-photolysis apparatus with subpicosecond time resolution. Excitation at λ = 280 nm gave for adenine the value 1.6 +/- 0.3 ps. The addition of ribose and the further addition...
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