Transient UV–vis absorption spectroscopic characterisation of 2′-methoxyacetophenone as a DNA photosensitiser
作者:Ofelia R. Alzueta、M. Consuelo Cuquerella、Miguel A. Miranda
DOI:10.1016/j.saa.2019.04.007
日期:2019.7
absorption as compared with other acetophenone derivatives. On the basis of transient infrared spectroscopy it has been previously claimed that 2M is an interesting photosensitiser for cyclobutane pyrimidine dimers (CPDs) formation. In the present paper, a complete UV–Vis transient absorption spectroscopic characterisation of this compound is provided, including triplet-triplet spectra, triplet lifetimes
DNA−Protein Cross-Linking: Model Systems for Pyrimidine−Aromatic Amino Acid Cross-Linking
作者:Guangxing Sun、Christopher J. Fecko、Robert B. Nicewonger、Watt W. Webb、Tadhg P. Begley
DOI:10.1021/ol052876m
日期:2006.2.1
We have synthesized simple model systems to explore the possibility of photo-cross-linking between the pyrimidine bases and the side chains of the aromatic amino acids. Thymine/phenylalanine and thymine/tyrosine models gave cross-links, and thymine/tryptophan models gave complex mixtures; the cytosine/phenylalanine model was unreactive. The quantum yields for the model cross-linking reactions were 18-46 times smaller than those for thymine dimer formation. Biphotonic excitation contributes little to the yield of these reactions.
Triplet Energy Transfer versus Excited State Cyclization as the Controlling Step in Photosensitized Bipyrimidine Dimerization
作者:Ofelia R. Alzueta、M. Consuelo Cuquerella、Miguel A. Miranda
DOI:10.1021/acs.joc.9b01423
日期:2019.11.1
triplet energytransfer is the rate controlling step, (b) excited state cyclization is the rate controlling step, and (c) the rate controlling step switches along the reaction. Thus, by introducing variations in the substitution at C5, the length of the linking bridge, or the substrate concentration, it is possible to switch from a process governed by the intrinsic dimerization step to an energy transfer-controlled