title: Excited state properties of naphtho-homologated xxDNA bases and effect of methanol solution, deoxyribose, and base pairing.
abstract: Design and synthesis of fluorescent nucleobase analogues for studying structures and dynamics of nucleic acids have attracted much attention in recent years. In the present work, a comprehensive theoretical study of electronic transitions of naphtho-homologated base analogues, namely, xxC, xxT, xxA, and xxG, was performed. The nature of the low-lying excited states was discussed, and the results were compared with those of x-bases. Geometrical characteristics of the lowest excited singlet ππ* states were explored using the CIS method. The calculated excitation maxima are 423, 397, 383, and 357 nm for xxA, xxG, xxC, and xxT, respectively, and they are greatly red-shifted compared with x-bases and natural bases, allowing them to be selectively excited in the presence of the natural bases. In the gas phase, the fluorescence from them would be expected to occur around 497, 461, 457, and 417 nm, respectively. The effects of methanol solution, deoxyribose, and base paring with their complementary natural bases on the relevant absorption and emission spectra of these modified bases were also examined.
authors.affiliation: School of Physics and Engineering, Qufu Normal University, Qufu, 273165, PR China. laibinzhang@gmail.com
authors.forename: Laibin
authors.initials: L
authors.lastname: Zhang
authors.forename: Tingqi
authors.initials: T
authors.lastname: Ren
authors.forename: Jianxiang
authors.initials: J
authors.lastname: Tian
authors.forename: Xiuqin
authors.initials: X
authors.lastname: Yang
authors.forename: Liuzhu
authors.initials: L
authors.lastname: Zhou
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Li
mesh_terms: D000225:Adenine / Q000737:chemistry; D020029:Base Pairing; D003198:Computer Simulation; D003596:Cytosine / Q000737:chemistry; D004247:DNA / Q000737:chemistry*; D003855:Deoxyribose / Q000737:chemistry*; D006147:Guanine / Q000737:chemistry; D000432:Methanol / Q000737:chemistry*; D008958:Models, Molecular; D009284:Naphthols / Q000737:chemistry*; D013941:Thymine / Q000737:chemistry
chemical_list: D009284:Naphthols; D003855:Deoxyribose; D006147:Guanine; D003596:Cytosine; D004247:DNA; D000225:Adenine; D013941:Thymine; D000432:Methanol