Synthesis and photophysical properties of syn- and anti-[2.n](3,9)carbazolophanes
摘要:
Both syn- and anti-[2.n](3,9)carbazolophanes (n = 4, 5) were obtained by the intramolecular [2 + 2] photocycloaddition of bis(3-vinyl-N-carbazolyl)alkanes. In the case of n = 4, the syn-isomer afforded sandwich excimer fluorescence, whereas the anti-isomer gave monomer fluorescence. (C) 1999 Elsevier Science Ltd. All rights reserved.
"Growth from surface" Methodology for the Fabrication of Functional Dual Phase Conducting Polymer polypyrrole/polycarbazole/Polythiophene (CP/polyPyr/polyCbz/PolyTh)-Carbon Nanotube (CNT) Composites of Controlled Morphology and Composition - Sidewall versus End-Selective PolyTh Deposition
申请人:Lellouche Jean-Paul
公开号:US20130040049A1
公开(公告)日:2013-02-14
A “growth from the surface” method for selectively depositing oxidative Liquid Phase Polymerizations (LPPs) onto the carbon nanotube (CNT) surface, said method comprising steps of: a. obtaining Multi-walled Carbon Nanotubes (MWC-NT); b. oxidized said MWCNTs to obtain oxidized COOH-MWCNTs; thereby (a) carboxylative opening oxidation-sensitive end-caps (polyCOOH end cluster); and, (b) introducing defect carboxylic (COOH) groups onto predetermined areas of said oxidized COOH-MWCNTs; c. COOH activating the polyCOOH shell using various COOH activating species; and, d. executing Liquid Phase Polymerization (LPP) oxidative depositing polymers selected from said polyCOOH polyTh-CP polymers, polyCOOH poly-Th-, polyEDOT (PEDOT)-, polyTh polyCOOH poly(thiophenyl-3 acetic acid, thiophenyl-3 acetic acid/EDOT, polyX, wherein X is elected from COOH, OH, NH2, polyCbz/polyPyr CP polymers and related combinatorial mixtures, polyCOOH PEDOT-poly(thiophenyl-3 acetic acid)′ thereby selectively depositing said oxidative LPPs onto said CNT surface.
Cyanamide- and oxa-bridged [3.n](3,9)carbazolophanes 1n and 2n (n = 4 and 5) were synthesized. X-ray analysis of 14 and 25 revealed that carbazole rings are taken to be partially overlapped geometry. Electronic spectra of 1n and 2n (n = 4 and 5) showed the existence of transannular π–π electronic interaction between two carbazole rings, whereas fluorescence of these carbazolophanes indicated monomer-like emission.
Effects of methyl substituent on the charge-transfer complexations of dicarbazolylalkanes with p-chloranil, tetracyanoethylene and tetracyanoquinodimethane
作者:Erol Asker、Ece Uzkara、Orhan Zeybek
DOI:10.1016/j.saa.2011.05.047
日期:2011.9
constants, enthalpies, and entropies of their charge-transfer (CT) complexes with the π-acceptors p-chloranil, tetracyanoethylene, and tetracyanoquinodimethane were investigated. 1,n-Di(3-methylcarbazolyl)alkanes formed CT complexes with higher equilibrium constants, more negative enthalpies and entropies than 1,n-dicarbazolylalkanes. Vibrational spectra of CT complexes of one of the donor molecules (1,4-dicarbazolylbutane)
Multicolor luminescentmaterials offer promising optoelectronic applications, especially organicsolid-state crystalline materials. Herein, we introduce a cocrystalstrategy to precisely regulate the multicolor photoluminescence behaviors of microcrystals through charge transfer (CT) interactions based on two components. Thereinto, compared with the single-component CzC6Cz (1,5-di(9H-carbazol-9-yl)-pentane)