A study of vibronic structures in the optical spectra of oligo(thienylene ethynylene)s

Giant macrocycles composed of thiophene, acetylene, and ethylene units

“…4). In the case of emission spectra, linear oligo(thienyleneeethynylene)s were reported to exhibit two major emission bands based on the vibronic structure of 0-0 and 0-1 transitions [24]. As shown in Table 1, fluorescence spectra of 1e5 show two major emissions at almost the same wavelengths (559e562 and 600e606 nm) with a large Stokes shift of 72e157 nm.…”

Syntheses, structures, and supramolecular properties of giant π‐expanded macrocyclic oligothiophenes

“…In contrast, the expanded cyclic oligothiophenes 1-5 show a red shift of the longest absorption maxima with increasing ring size (6 ≈ 1 < 2 < 3 < 4 < 5 nm), reflecting an almost full conjugation through the rings. In the case of emission spectra, linear oligo(thienylene-ethynylene)s exhibit two major emission bands based on vibronic structure of 0-0 and 0-1 transitions [42]. As shown in Fig.…”

Synthesis and properties of oligo(2,5-thienylene-ethynylene)s

“…Pd(0) is inserted into the C−Hal bond of R The relatively rigid conjugated OTE chains 3 (X=S) soon become (n≥4) insoluble unless solubilizing side chains are attached. Therefore, alkyl, 11,13,14,18,19,[21][22][23][25][26][27][28][31][32][33] aryl, 17 alkoxy 34 or alkylsulfanyl 34 groups are normally attached to one or both free positions of the thiophene rings.…”