This review article provides a detailed overview of pyrene containing colorimetric and fluorometric chemosensors based on different binding mechanisms which fulfill the criteria of affinity, selectivity and sensitivity.
A controllable regioselective approach to achieve dipolar functionalization at the active sites (1,3-positions) and K-region (5,9-positions) of pyrene is demonstrated. Following this strategy, a set of dipolar 1,3-diphenyl-5,9-di(4-R-phenylethynyl)pyrenes were synthesized and systematically investigated by 1 H/ 13 C NMR spectroscopy, X-ray crystallography, electronic spectra, as well as by theoretical calculations. Especially, by adjusting the substituents at the 5,9-positions of pyrene, the pyrene-based dipolar molecules 4 exhibit tunable optical properties with a wide emission band from blue to orange-red.
Synthesis of highly flexible calix[3]benzofurans; effects of substituent groups on calix[3]benzofuran conformations were studied by DFT computational methods.
Novel [n]benzofuranophanes (n = 8 & 10) 2a-b have been prepared by successive intramolecular cyclization from 5,19-di-tert-butyl-8,22-dimethoxy[n]metacyclophane-1-yne (syn-1a-b) by treatment with BBr 3 in CH 2 Cl 2 at room temperature for 8 h.[2.n]Benzofuranophanes 2a-b were also obtained by treatment of 1,2-di-endo-bromo-5,19-ditert-butyl-8,22-dimethoxy[n]metacyclophane (meso-3a-b) with BBr 3 in CH 2 Cl 2 by using same reaction condition. 1 H NMR spectra of 2a-b reveals the formation of intramolecular hydrogen bonding between hydroxyl proton with the oxygen of furan moiety and X-ray analysis shows that the length between H (OH) and O (furan) are 1.981 and , respectively. The conformation of [8]benzofuranophane 2a in solution is rigid and restricted rotation around the diaryl linkage rather than [10]benzofuranophane 2b because of weak intramolecular hydrogen bonding and short length of cross-linking chain.
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