title: The formation of thymidine-based T-tetramers with remarkable structural and metal ion size effects.
abstract: We present direct ESI Q-TOF MS and X-ray evidence for remarkable structural and metal ion size effects on the formation of thymidine-based T-tetramers. The conventional H-bond acceptors on the ribose and deoxyribose may disfavor the formation of T-tetramers, and in the series of alkali metal ions, lithium did not induce T-tetramer due to its small ion size. Sodium, potassium, rubidium and caesium could produce thymidine-based T-tetramers. Furthermore, rubidium and caesium could induce T-pentamers and dimeric T-pentamers probably due to their larger ion sizes.
authors.affiliation: Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Qun
authors.initials: Q
authors.lastname: Luo
authors.forename: Dayong
authors.initials: D
authors.lastname: Wu
authors.forename: Shixiong
authors.initials: S
authors.lastname: Liu
authors.forename: Daihua
authors.initials: D
authors.lastname: Tang
authors.forename: Yong
authors.initials: Y
authors.lastname: Huang
authors.forename: Xinhou
authors.initials: X
authors.lastname: Liu
authors.forename: Fuyi
authors.initials: F
authors.lastname: Wang
authors.forename: Ruiyao
authors.initials: R
authors.lastname: Wang
authors.forename: Gang
authors.initials: G
authors.lastname: Wu
mesh_terms: D007477:Ions / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009841:Oligonucleotides / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D013936:Thymidine / Q000737:chemistry*
chemical_list: D007477:Ions; D008670:Metals; D009841:Oligonucleotides; D013936:Thymidine