13640-78-3Relevant articles and documents
Synthesis and Optoelectronic Properties of Thiophene Donor and Thiazole Acceptor Based Blue Fluorescent Conjugated Oligomers
Mahesh,Karpagam
, p. 1457 - 1466 (2016)
We report on the synthesis and characterization of low band gap, blue light emitting and thermal stable conjugated oligomer by Wittig condensation. Thiophene and thiazole type of donor-acceptor based series of conjugated oligomers, Oligo-4,5-bis-[2-[5-[2-thiophene-2-yl-vinyl]thiophene-2-yl]-vinyl]-thiazole (OBTV-TZ) and Oligo-2,4,5-Tris–[2-[5-[2-thiophene-2-yl-vinyl]thiophene-2-yl]-vinyl]-thiazole (OTTV-TZ) were synthesized. These oligomers were confirmed by FT-IR and 1H-NMR and LC/MS analysis. The effect of the number of thiophene rings on the optical, electrochemical, thermal and morphological properties of the oligomers were systematically investigated. Both oligomers were exhibited almost same absorption wavelength in methanol solution (λmax?=?365?nm and 369?nm) which indicates both oligomers illustrate similar intra molecular charge transfer (ICT). In solid state, the oligomers were exhibited broadening peaks with higher onset absorptions (λmax?=?600?nm and 580?nm). The photoluminescence absorption spectrum of the oligomers was observed at 433?nm and 434?nm respectively in methanol solution with blue emission. The electrochemical band gap (Egec) of the OBTV-TZ was 1.55?eV (low band gap) and OTTV-TZ was exhibited greater highest occupied molecular orbital (HOMO) value (EHOMO?=??6.6?eV). Moreover morphological parameters of both oligomer film of 2D and 3D diagrams were observed by using AFM studies.
New amidino-benzimidazolyl thiophenes: Synthesis and photochemical synthesis
Starcevic, Kristina,Boykin, David W.,Karminski-Zamola, Grace
, p. 218 - 222 (2003)
The photochemical synthesis of amidino-benzimidazolyl thiophenes was discussed. The amidino-benzimidazolyl-substituted bis-1,2-(2-thienyl) ethenes and benzo[1,2-b:4,3-b′] dithiophenes were prepared by the condensation of amidino-substituted o-phenylene diamines with corresponding dialdehydes. The synthesized bis-cationic bis-amidino benzimidazolyl substituted diphenylfurans were found to inhibit HIV-1 infection.
Unusual titanium-induced McMurry coupling of 4-oxo-4H-chromene-2-carbaldehydes enroute to bis-chromones
Yerrabelly, Jayaprakash Rao,Bathini, Pavan Kumar,Yerrabelly, Hemasri,Vadapalli, Kishore
, p. 4705 - 4709 (2021/03/22)
Ti/Zn-mediated McMurry coupling of a series of 4-oxo-4H-chromene-2-carbaldehydes afforded unusual chemoselective CH2-CH2tethered bis-chromones. Studying the reaction parameters and reagents further confirmed that the formation of unexpected coupled products is selective to 4-oxo-4H-chromene-2-carbaldehydes. This methodology demonstrated a simple and efficient route for the synthesis of bis-chromones.
Synthetic method A-D-A configuration organic conjugated micromolecule
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Paragraph 0026; 0033-0037, (2019/09/18)
The invention provides a synthesis method of A-D-A conjugated small molecules. The method comprises the following steps: (1) by using 2-formylthiophene as a raw material and using zinc powder and titanium tetrachloride as catalysts, preparing a compound (I); (2) activating the site 2 of the compound (I) by using n-butyllithium, so as to form a lithium salt intermediate; then, adding 1-bromooctane to prepare a compound (II); (3) activating the site 2 of the compound (II) by using n-butyllithium, so as to form a lithium salt intermediate; then, adding trimethyltin chloride to prepare a compound (III); (4) performing reaction by 4,7-dibromo diazosulfide and the compound (III) to prepare a compound (IV); (5) respectively connecting 2-octyl trans-terthienyl based on diazosulfide onto the two ends of R1, R2, R3 and R4 to synthesize final products of S1, S2, S3 and S4.
