Highly Fluorescent Conjugated Copolymers Constructed by Alternating Heterocyclic Diazoles and Alkoxy Benzene

Abstract

Highly fluorescent copolymers Oxa-Bz and Thia-Bz consisting of alternating heterocyclic diazole derivative and alkoxy benzene were designed and regioselectively synthesized by the Suzuki-Miyaura reaction with a palladium catalyst. Density functional theory calculation of modeling the repetitive unit suggested the possibility of full conjugation along the polymer chain and the occurrence of intramolecular electron transfer in which the alkoxy benzene moiety was the electron donor and the diazole moiety was the electron acceptor. The extension of conjugation length from the corresponding monomers to the copolymer was confirmed by electrochemical analysis. The redox potentials of the resulting copolymers were significantly reduced in comparison with those of the monomers. The photophysical properties, including absorption and emission spectra, also showed that the energies of the frontier orbitals changed after the covalent bonding between the electron donor and acceptor groups. Moreover, the emission of these two copolymers showed solvent-dependence, whereby the emission band shifted to longer wavelengths in higher polarity solvents. The fluorescence quantum yields of Oxa-Bz reached 68% and that of Thia-Bz 71%. This strong fluorescence might be guaranteed by the rigidity of these copolymers.

Quantitative analysis of the main components in ceramic raw materials based on the desktop LIBS analyzer

“…Research on the element content and mineral composition of soil and rock using LIBS is also a hot field [10][11][12][13][14]. LIBS-based analysis of ceramic raw materials (such as clay, feldspar and quartz) is usually qualitative analysis or quantitative analysis of one or several elements in samples from a specific origin or specific raw material types [15][16][17][18][19][20]. Tang et al analyzed the content of K element in feldspar raw materials and improved the analysis accuracy by Lorentz fitting [18].…”

“…Tang et al analyzed the content of K element in feldspar raw materials and improved the analysis accuracy by Lorentz fitting [18]. Chen et al measured the content of Si, Al, Ca, K, Mg, Mn, Ti and Fe in drilling cutting samples by logging a special laser-induced breakdown spectrometer [20]. Unified modeling and simultaneous quantitative analysis of the eight main oxides and L.O.I.…”

Virtual Screening of 1,2-Diazoles Compounds for Chagas Disease: A Prediction Model

“…The disease, to date, does not present effective drug treatment for its chronic stage [3,4] . Due to this, there is a constantly search for new compounds, among which are the diazoles derivatives, which are heterocyclic compounds, containing two nitrogen atoms in a five-membered ring exhibit remarkable reactivity as well as are involved in a large number of chemical reactions and possible activities [5] .…”