α,ω-Bis(trialkynyltin) Compounds with a Linear or Cross-Shaped Spacer
摘要:
The preparation of arylene-, alkylene-, or dimethylenediphenyl-bridged bis(trichlorotin) compounds with two or three phenyl rings from the reaction of the corresponding hexacyclohexyl derivatives with tin tetrachloride is described. Hexachlorides with mixed aryl-alkyl bridges were prepared in the same way. When arylene-bridged ditins were substituted on aryl rings with alkoxy groups, it was necessary to use hexamethyl derivatives instead of the cyclohexyl compounds to obtain the corresponding hexachlorides. In these compounds, weak inter- and/or intramolecular interactions were detected by X-ray analysis. The ditin hexachlorides were transformed into the corresponding hexaalkynyl derivatives, precursors for hybrid materials.
Diverse structures of metal–organic frameworks via a side chain adjustment: interpenetration and gas adsorption
作者:Kang Shen、Ling Qin、He-Gen Zheng
DOI:10.1039/c6dt03086f
日期:——
hindrance for the pendant –Me group leads to the formation of a parallel stacked network. Therefore, compounds 1 and 2 feature 3D structures with inclined polycatenation (2D + 2D → 3D); compound 3 exhibits a non-interpenetrated 2D + 2D → 2D parallel stacked network. These complexes have been characterized by single crystal X-ray diffraction, infrared spectroscopy, thermogravimetry, elemental analysis
Synthesis of donor-acceptor-type conjugated polymer dots as organic photocatalysts for dye degradation and hydrogen evolution
作者:Yougjin Gwon、Seonyoung Jo、Hyun-Jun Lee、Soo Young Park、Taek Seung Lee
DOI:10.1016/j.polymer.2021.124004
日期:2021.8
The cyclic voltammograms of the CPs showed their generation ability for ROS, in which the ROS generation efficiency would depend on the main chain structure. Because the CPs are inherently hydrophobic, they were fabricated in nanoparticle (NP) form for convenient use in an aqueous solution. The CP NPs showed excellent dye degradability under visible light. In addition, CPs were incorporated in a filter
A series of new organic semiconducting copolymers composed of (2E,2'E)-3,3'-[2,5-bis(octyloxy)-1,4-phenylene]-bis[2-(thiophen-2-yl)acrylonitrile]}(OPTAN) and 10(2'-ethylhexylphenothiazine) (PTZ) monomers, (the copolymers are hereafter referred to as poly(OPTAN-co-PTZ)s), were synthesized by using Suzuki coupling polymerization in which the monomer ratios were controlled. An increase in the OPTAN content shifted the peak and onset absorption of the copolymers to the longer wavelength regions, which resulted in a decrease in the band gap energy. The maximum UV absorption of the polymer films was in the range 523–540 nm and the optical band gap energies were in the range 1.90–1.87 eV. Energy levels of the highest occupied molecular orbital (HOMO) of the polymers were determined by cyclic voltammetry (CV). The HOMO energy level of the copolymers was between −5.07 and −5.12 eV. Photovoltaic devices were fabricated by using the copolymers as the p-type donor and C60-PCBM or C70-PCBM as the electron acceptors. The device with poly(50OPTAN-alt-50PTZ) and C70-PCBM showed the best performance among the fabricated devices; the open circuit voltage, short circuit current, fill factor, and maximum power conversion efficiency of this device were 0.79 V, 5.25 mA/cm2, 0.30, and 1.25%, respectively.
A General Strategy for the Synthesis of Conjugated Polymers Based upon the Palladium-Catalysed Cross-Coupling of Grignard Reagents with Unsaturated Halides
作者:Francesco Babudri、Donato Colangiuli、Gianluca M. Farinola、Francesco Naso
Palladium-catalysedcross-coupling between aromatic bis-organomagnesium reagents and aromatic dihalides has been experimentally evaluated as a general methodology for the synthesis of soluble conjugated polymers such as poly(p-phenylene)s 6 and 7, poly(p-terphenylenevinylene) 8, poly(phenylenethiophene) 9 and poly(phenylenepyridine) 10. Appropriate experimental conditions were first found in model