π-Expanded Ketocoumarins as Efficient, Biocompatible Initiators for Two-Photon-Induced Polymerization
作者： Rashid Nazir , Paulius Danilevicius , Adina I. Ciuciu , Maria Chatzinikolaidou , David Gray
DOI: 10.1021/CM500612W
关键词: Polymerization 、 Alkyl 、 Absorption (chemistry) 、 Fluorescence 、 Conjugated system 、 Amine gas treating 、 Photochemistry 、 Solubility 、 Chromophore 、 Chemistry
摘要: A series of π-expanded coumarins comprising 4–5 conjugated rings were designed and synthesized. The strategic placement two dialkylamino groups containing long alkyl chains attached to the peripheral ends bis-coumarins resulted in dyes with superb solubility. As α,β-unsaturated ketones, these compounds display properties donor–acceptor–donor (D–A–D)-type chromophores. Photophysical studies new functional revealed a combination favorable properties: strong absorption blue green light, weak fluorescence, reasonable two-photon (2PA) cross-section, complete solubility nonpolar solvents. fluorescence lifetimes coumarin-derived ketones measured for first time. amine at positions produced cross-section values level 150–400 GM around 800 nm, which generated photoinitiation. highest 2PA was approximately 400 de...
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