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- W2044202004 abstract "Novel heterocycle-based azine/azinium−(π-bridge)−pyrrole systems, [(1-(pyrid-4-yl)-2-(N-methylpyrrol-2-yl)]ethene (1), 5-[(N-methylpyrrol-2-yl)azo]quinoline (2), 5-[(N-methylpyrrol-2-yl)azo]isoquinoline (3), and the corresponding N-methotriflates 4−6 were synthesized and characterized. Chromophore precursors 1−3 react with iodobenzyl-functionalized surfaces (10) affording polar-ordered σ-bonded thin films 7−9, respectively. All systems were studied by optical (UV−visible, photoluminescence) spectroscopies, electrochemical (CV), and thermal (TGA, DSC) techniques. Self-assembled chromophore monolayers 7−9 on glass, quartz, and silicon substrates have been characterized by a full complement of physicochemical techniques: optical spectroscopy, aqueous advancing contact angle measurements, specular X-ray reflectivity, atomic force microscopy, and angle-dependent polarized second harmonic generation. Film second harmonic generation responses χ(2)zzz vary more than 1 order of magnitude ranging from 1.3 and 1.6, to 34 × 10-8 esu for 9-, 8-, and 7-based monolayers, respectively. This study demonstrates the following: (i) SA monolayers can be prepared using various types of azine-containing precursors; (ii) chromophore and SA film properties are influenced predominantly by the nature of the π-deficient azinium acceptor; (iii) unsubstituted, π−excessive pyrrol-2-yl rings can act as primary donor groups in push−pull conjugated systems." @default.
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- W2044202004 date "2002-11-12" @default.
- W2044202004 modified "2023-10-10" @default.
- W2044202004 title "Azinium−(π-Bridge)−Pyrrole NLO-Phores: Influence of Heterocycle Acceptors on Chromophoric and Self-Assembled Thin-Film Properties" @default.
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- W2044202004 doi "https://doi.org/10.1021/cm0205635" @default.
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