Synthesis and optical properties of H-shaped silicon-containing molecule with bithiophene units
作者:Akinobu Naka、Ryuichi Fukuda、Yoshifumi Jahana、Joji Ohshita、Hisayoshi Kobayashi、Mitsuo Ishikawa
DOI:10.1016/j.jorganchem.2013.05.024
日期:2013.10
The H-shaped molecule, 5,5'-bis[(5'-tert-butyldimethylsilyl)-2,2'-(bithiophen-5-yl)]methylsilyl}-2,2'-bithiophene (3) was prepared by the reaction of 5'-(tert-butyldimethylsilyl)-5-lithio-2,2'-bithiophene with 2-bromo-5-(dichloromethylsilyl)thiophene, followed by treatment of the resulting product (5-bromothiophen-2-yl)bis[5'-(tert-butyldimethylsilyl)-2,2'-bithiophen-5-yl](methyl)silane (1) with compound (2), obtained by the reaction of the lithiated derivative of 1 with 2-isopropyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, in the presence of dichlorobis(triphenylphosphine)palladium, as light yellow solids. Compound 3 showed absorption maximum (lambda(max)) at 336 nm with a molar absorption coefficient (epsilon) of 113,000 M-1 cm(-1) in dioxane. The fluorescence spectrum of 3 excited at 336 nm in dioxane displayed the emission maxima at 377 and 387 nm, with the fluorescence quantum yield of 48%. We also carried out theoretical treatment of compound 3 to elucidate the geometrical and electronic structure, using the Gaussian 03 program package, with the 6-31G and 6-31G(d) basis sets. (C) 2013 Elsevier B.V. All rights reserved.