- OPTICAL DATA COMMUNICATION SYSTEM COMPRISING PARA-PHENYLENEVINYLENES AND SPECIFIC PARA-PHENYLENEVINYLENES
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An optical data communication system comprising para-phenylenevinylenes, a receiver for an optical data communication system comprising para-phenylenevinylenes, a transmitter for an optical data communication system comprising para-phenylenevinylenes, the use of para- phenylenevinylenes in an optical data communication system, specific para-phenylenevinylenes and their preparation.
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Page/Page column 69-70
(2020/01/08)
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- Oligo p-Phenylenevinylene Derivatives as Electron Transfer Matrices for UV-MALDI
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Phenylenevinylene oligomers (PVs) have outstanding photophysical characteristics for applications in the growing field of organic electronics. Yet, PVs are also versatile molecules, the optical and physicochemical properties of which can be tuned by manipulation of their structure. We report the synthesis, photophysical, and MS characterization of eight PV derivatives with potential value as electron transfer (ET) matrices for UV-MALDI. UV-vis analysis show the presence of strong characteristic absorption bands in the UV region and molar absorptivities at 355 nm similar or higher than those of traditional proton (CHCA) and ET (DCTB) MALDI matrices. Most of the PVs exhibit non-radiative quantum yields (φ) above 0.5, indicating favorable thermal decay. Ionization potential values (IP) for PVs, calculated by the Electron Propagator Theory (EPT), range from 6.88 to 7.96 eV, making these oligomers good candidates as matrices for ET ionization. LDI analysis of PVs shows only the presence of radical cations (M+.) in positive ion mode and absence of clusters, adducts, or protonated species; in addition, M+. threshold energies for PVs are lower than for DCTB. We also tested the performance of four selected PVs as ET MALDI matrices for analytes ranging from porphyrins and phthalocyanines to polyaromatic compounds. Two of the four PVs show S/N enhancement of 1961% to 304% in comparison to LDI, and laser energy thresholds from 0.17 μJ to 0.47 μJ compared to 0.58 μJ for DCTB. The use of PV matrices also results in lower LODs (low fmol range) whereas LDI LODs range from pmol to nmol. [Figure not available: see fulltext.].
- Castellanos-García, Laura J.,Agudelo, Brian Castro,Rosales, Hernando F.,Cely, Melissa,Ochoa-Puentes, Christian,Blanco-Tirado, Cristian,Sierra, Cesar A.,Combariza, Marianny Y.
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p. 2548 - 2560
(2017/12/12)
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- Application of Phase-Transfer Catalysis to the Synthesis of Mono- and Bis-stilbenes and Styryls
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A novel and convenient method has been developed for the synthesis of substituted stilbenes by the condensation of active methyl group in suitably substituted toluenes with aromatic aldehydes in aq. medium at room temperature using benzyltriethylammonium chloride as a phase-transfer catalyst.This method has also been applied for the preparation of heterocyclic styryls and extended to the synthesis of bis-stilbenes and bis-styryls using aromatic dialdehydes in place of monoaldehydes.A comparison of the results shows that the present method is superior to the conventional methods in many respects.
- Lokhande, S. B.,Rangnekar, D. W.
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p. 485 - 488
(2007/10/02)
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- Fluorescence of Distyrylbenzenes and Distyrylstilbenes
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Absorption, corrected emission spectra, fluorescence quantum yields, and preparation are reported for distyrylbenzene, distyrylstilbene and substituted derivatives.The Stokes shifts measured in three solvents and correlated with quantum chemical calculations. - Key words: Fluorescence, Distyrylbenzenes
- Erckel, R.,Fruehbeis, H.
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p. 1472 - 1480
(2007/10/02)
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