Rodriguez-Alba, Efrain published the artcileSynthesis, characterization and optical properties of novel oligothiophenes bearing pyrene units attached via well defined oligo(ethylene glycol) spacers, Quality Control of 239075-02-6, the publication is Synthetic Metals (2015), 92-105, database is CAplus.
Two new thiophene monomers bearing pyrene units attached via di(ethylene glycol) and tetra(ethylene glycol) spacers were synthesized, 3-methyl-4-(diethoxy) thiophene (M2) and 3-methyl-4-(tetraethoxy) thiophene (M4). These monomers were linked to thiophene and bithiophene via a Suzuki coupling reaction to give the corresponding terthiophenes and quaterthiophenes: [3,3-(di (diethoxypyrene)), 4,4”’dimethyl-2,2: 5#14-15#-terthiophene (TT2)], [3,3-(di(tetraethoxypyrene)), 4,4”’dimethyl-2,2:5#14-15#-terthiophene (TT4)], [3,3”’-di(diethoxypyrene), 4,4”’methyl-2,2′:5′: 2”:5”,2”’-quaterthiophene (QT2)], and [3,3”’-di(tetraethoxypyrene), 4,4”’methyl -2,2′:5′:2”:5”,2”’-quaterthiophene (QT4)]. The obtained oligothiophenes were characterized by 1H, 13C NMR spectroscopies and MALDI-TOF mass spectrometry. The optical properties of these compounds were studied by absorption and fluorescence spectroscopy. The absorption spectra of these compounds exhibited a broad absorption band at λmax = 350 nm arising from the S0 → S2 transition of the pyrene group. This broadening is an indication of the presence of pyrene-pyrene interactions in the ground state. A discrete band at ca λ = 385 due to the S0 → S1 transition (n-π*) of the oligothiophene backbone was also observed The emission spectra of oligomers TT2, TT4, QT2 and QT4 showed a “monomer emission” band at λM = 379-450 nm followed by an intense excimer emission band at λE = 570 nm due to intramol. pyrene-pyrene interactions. The effect of the flexible spacer length and that of the oligomer backbone influences significantly the formation of pyrene-pyrene complexes.
Synthetic Metals published new progress about 239075-02-6. 239075-02-6 belongs to alcohols-buliding-blocks, auxiliary class Thiophene,Boronic acid and ester,Boronate Esters, name is 5,5′-Bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2,2′-bithiophene, and the molecular formula is C20H28B2O4S2, Quality Control of 239075-02-6.
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