Transient absorption and time-resolved vibrational studies of photophysical and photochemical processes in DNA-intercalating polypyridyl metal complexes or cationic porphyrins

摘要: Abstract Recent advances in the use of transient absorption (TA) and time-resolved vibrational spectroscopies (TRIR TR3) to study both excited states reaction intermediates metal complexes porphyrins which intercalate into DNA are reviewed. A particularly well-studied class compounds, nicely illustrates comparative advantages these techniques, is that ruthenium dppz where complex might show light-switching or photo-oxidising behaviour depending on nature ancillary ligand. Comparative data Re- Cr-dppz also considered. In second part this review studies porphyrins, known DNA, considered with particular emphasis tetramethyl-pyridiniumporphyrins, photophysical metal-free various derivatives compared.