Facile, Regioselective Synthesis of Highly Solvatochromic Thiophene-Spaced N-Alkylpyridinium Dicyanomethanides for Second-Harmonic Generation
摘要:
The facile and clean synthesis of a navel class of highly solvatochromic chromophores 1 is reported. Compounds 1 are push-pull systems containing a negatively charged dicyanomethanide as a donor group and a positively charged N-alkylpyridinium as an acceptor group. The terminal polar functions are spaced by a thiophene-based moiety containing one or two heterocyclic rings and none, one, or two ethylene bridges. Chromophores 1 have been obtained through a general synthetic scheme involving, as the last step, the 100% regioselective alkylation of the precursor bidentate anions 2, where two competing nucleophilic sites, one neutral at the pyridic nitrogen and one anionic at the carbanionic carbon of the dicyanomethanide group, are present. The unprecedented highly regioselective attack of the alkylating agent onto the neutral pyridic nitrogen rather than the highly charged carbanionic carbon has been also confirmed in the case of the intermolecular competition. Multinuclear (C-13 and N-15) NMR spectroscopy has been used to investigate the structure and the extent of intramolecular charge transfer in 1, which are shown to exist in the ground state as highly charge-separated zwitterionic systems. Experimental results are discussed and compared with semiempirical (PM3) computations. The solvatochromic response of compounds 1, among the highest ever reported in the literature for similar systems, candidates this class of compounds as very attractive active components of nonlinear optical materials.
Palladium-Catalyzed Cross-Coupling Reaction of a Chiral Ferrocenyl Zinc Reagent with Aromatic Bromides: Application to the Design of Chiral Octupoles for Second Harmonic Generation
Palladium catalyzed cross coupling reaction of a chiral ferrocenylzinc reagent with aryl bromides allowed the introduction of a planary chiral ferrocenyl subunit on an aryl fragment. Using this method, new C3 symmetric chiral architecture bearing organometallic donor-acceptor fragments were assembled starting from a common tris aldehyde precursor. The non- linear optical properties were measured using the Harmonic Light Scattering method and the potentiality for the new chromophores to behave as octupoles is also discussed.
申请人:Industry-Academic Cooperation Foundation, Dankook University 단국대학교 산학협력단(220050166344) BRN ▼106-82-12299
公开号:KR20150041434A
公开(公告)日:2015-04-16
작은 밴드갭을 갖는 싸이오펜 단위와 비닐렌 단위로 이루어진 전자주게 블록과 전자받게 블록을 공중합함으로써 태양광의 효과적인 흡수를 통한 고효율의 태양전지를 제조할 수 있는 신규한 싸이오펜 유도체, 그 제조방법 및 이를 포함하는 유기태양전지가 제공된다. 본 발명에 따르면, 작은 밴드갭을 가지는 신규한 싸이오펜 유도체를 통하여 태양광을 효과적으로 흡수할 수 있고, 용해도를 증가시킬 수 있으며, 성능이 향상된 유기태양전지를 제공할 수 있다.
Synthesis, structures, and optical and electrochemical characteristics of novel crown-containing polythiophene systems
作者:E. V. Lukovskaya、A. A. Bobylyova、O. A. Fedorova、Yu. V. Fedorov、A. V. Anisimov、Y. Didane、H. Brisset、F. Fages
DOI:10.1007/s11172-007-0146-5
日期:2007.5
The synthesis, structures, and optical and electrochemical characteristics of novel crown-containing styryl mono-and polythiophenes were described. The double bonds were constructed by the Horner-Wadsworth-Emmons method. The Suzuki and Stille cross-coupling reactions were used to create polythiophene chains. Optical measurements revealed intense absorption and fluorescence of crown-containing polythiophenes; the band positions and shapes in their absorption and emission spectra depend on the structure of the polythiophene. The electrochemical characteristics of the compounds obtained were measured.
Highly fluorogenictetrazinebioorthogonalprobes emitting at near‐infrared wavelengths are in strong demand for biomedical imaging applications. Herein, we have developed a strategy for forming a palette of novel Huaxi‐Fluor probes in situ, whose fluorescence increases hundreds of times upon forming the bioorthogonal reaction product, pyridazine. The resulting probes show large Stokes shifts and high
Solution processable star-shaped molecules with a triazine core and branching thienylenevinylenes for bulk heterojunction solar cells
作者:Chien-Yi Huang、Wan-Hua Lee、Rong-Ho Lee
DOI:10.1039/c4ra07139e
日期:——
Two new star-shaped A–π–D molecules with triazine as a core and an acceptor unit, thienylenevinylene as the π bridge, and tert-butyl-substituted triphenylamine (tTPA)- or carbazole (tCz) as the end group and donor units of TTVTPA and TTVCz were synthesized for their application as donor materials in solution processed bulk heterojunction organic solar cells (OSCs).