Polymers containing backbone acetylene, anthracene and tetra-, penta- or hexa-coordinate silicon units: UV–visible, photoluminescence and solution χ(3) non-linear optical properties
作者:William E. Douglas、Daniel M. H. Guy、Ajoy K. Kar、Changhai Wang
DOI:10.1039/a805518a
日期:——
Poly(aryleneethynylenesilylene)s of general structure (CCSiR2CCX)n (X = 9,10-anthrylene) containing tetra-, penta- or hexa-coordinate silicon exhibit high Ï(3) values, the absorbance and emission spectra being red-shifted with respect to those for the corresponding monomers R2Si- (CCAr)2 (Ar = 9-anthryl); these properties are consistent with extensive through-Si conjugation along the backbone.
eliminative aromatization of sila[5]pericyclyne precursors with adjacent C─OR and C─H vertices. The synthesis of tetraoxy-sila[5]pericyclyne representatives (“carbo-silolanes” 2a and 2b ) has been tackled through several [(15–n)+n] ring formation strategies. After having first attempted a [14+1] route from dichlorodiphenylsilane and a skipped pentayne ( 3 ), a [5+10] route proceeded successfully from
From Bidentate Gallium Lewis Acids to Supramolecular Complexes
作者:Jan Horstmann、Mentor Hyseni、Andreas Mix、Beate Neumann、Hans-Georg Stammler、Norbert W. Mitzel
DOI:10.1002/anie.201701303
日期:2017.5.22
Bidentate gallium Lewis acids were prepared by the reaction of diethynyldiphenylsilane with neat trimethyl- or triethylgallium. Bis[(dimethylgallyl)ethynyl]diphenylsilane (1) and diethylgallyl derivative 2 were characterized as Et2 O or pyridine adducts by NMR spectroscopy; 2⋅2Py was isolated. Lewis acids 1 and 2 form host-guest adducts with bidentate nitrogen bases, but defined cyclic 1:1 adducts
作者:Jan Horstmann、Stefanie Reger、Beate Neumann、Hans-Georg Stammler、Norbert W. Mitzel
DOI:10.1515/znb-2017-0027
日期:2017.6.27
bis(2-methylpyridin-5-yl)acetylene (2), bis(4-fluorophenyl)acetylene (3) and bis(4-trifluoromethylphenyl)acetylene (4) in 60% to 82% yield. In the case of 2, the by-product bis(2-methylpyridin-5-yl)butadiyne (2a) was isolated in 12% yield. The occurring desilylation reaction was investigated by treating bis(phenylethynyl)diphenylsilane (5) under the same conditions. The formation of 1-fluoro-4-(phenylethynyl)benzene
A silicon-cored tetraphenyl benzene derivative with aggregation-induced emission enhancement as a fluorescent probe for nitroaromatic compounds detection
作者:Yan Liang
DOI:10.1016/j.saa.2019.03.050
日期:2019.6
method. TPB and TPB-Si both showed aggregation-inducedemissionenhancement (AIEE) properties in tetrahydrofuran/water mixtures. The fluorescence-quenching behaviors of the two compounds with different nitroaromatic compounds were also investigated. TPB and TPB-Si both showed low detection limit, high sensitivity, and high quenching efficiency in detecting nitroaromatic compounds. Furthermore, the two