Abstract
AbstractThe photochemistry of Ru‐tris‐(1,4,5,8‐tetraazaphenanthrene) (Ru(tap)32+) in the absence and in the presence of adenosine‐5′‐monophosphate (AMP) and guanosine‐5′‐monophosphate (GMP) has been studied by flash photolysis and by steady state illumination. Laser pulsed irradiation of Ru(tap)32+ in the presence of AMP produces, with a rather low yield, the transient reduced complex, Ru(tap)31+, by electron transfer from AMP to the excited complex. The flash photolysis of the same solution, after pre‐illumination, shows that a new photoactive compound absorbs at = 500 nm and its efficiency of production decreases at lower temperature and pH. Comparison with the photodechelation of Ru(tap)32+ in the absence of mononucleotide, and with the photoadduct formation between Ru(tap)32+ and GMP/AMP, leads to the conclusion that this photoactive species could correspond to [Ru(tap)2AMP, X]n+ formed by photosubstitution of a tap ligand in the presence of AMP.
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