DNA-Controlled Photoisomerization of Bis(2-(1-methyl-pyridinium-4-yl)vinyl)benzene

The photoisomerization study of bis(2-(1-methylpyridinium-4-yl)vinyl)benzene dye in the absence and the presence of DNA revealed that the DNA affects photoisomerization quantum yields of the ligand. The DNA-promoted formation of an E,E isomer was accounted for the contribution of two factors: (i) the binding differentiation between structurally. dissimilar isomers and (ii) the quenching of ligand fluorescence by the DNA.