A 3-hydroxychromone with dramatically improved fluorescence properties
摘要:
A new 3-hydroxychromone derivative, 2-(6-diethylaminobenzo[b]furan-2-yl)-3-hydroxychromone. has been synthesized by a concise route. Possessing dual emission common for 3-hydroxyflavones, it exhibits strong red shifts of both absorption and fluorescence spectra, which makes it the longest wavelength fluorescent dye among all known chromones. It also demonstrates a significant increase in fluorescence quantum yield in aprotic solvents and shift in solvent-polarity-dependent switch between normal and tautomer emissive forms. This derivative offers new possibilities in designing novel molecular sensors. (C) 2001 Elsevier Science Ltd. All rights reserved.
3-Hydroxychromones(3HCs)是 荧光染料,以回应 溶剂通过在发射光谱中两个分离良好的谱带的相对强度的变化和变化来扰动。这些条带源自分子内的激发态质子转移 (ESIPT)反应,可以通过不同的因素进行调节,包括3HC的修饰 发色团。鉴于3HC作为分子传感器的潜在基本元素的重要性,我们对3HC结构与光谱性质之间的相关性进行了首次系统研究。在电子束的相反侧引入了两个系列的已知和新合成的2-苯基-3-羟基色酮和具有不同电子给体取代基的2-(2-苯并[ b ]呋喃基)-3-羟基色酮。发色团,在中进行了比较 溶剂不同的极性。用2-苯基取代2-(2-苯并[ b ]呋喃基)并引入电子给体 在2-芳基上不仅会改变吸收和 荧光光谱为红色,但也强烈调节ESIPT行为,导致两个发射带I N * / I T *的强度比急剧增加。相反,引入7-甲氧基导致完全相反的光谱效应。所有研究过的3HC染料证明ln(I
Toward Point-of-Care Detection of <i>Mycobacterium tuberculosis</i>: A Brighter Solvatochromic Probe Detects Mycobacteria within Minutes
作者:Mireille Kamariza、Samantha G. L. Keyser、Ashley Utz、Benjamin D. Knapp、Christopher Ealand、Green Ahn、C. J. Cambier、Teresia Chen、Bavesh Kana、Kerwyn Casey Huang、Carolyn R. Bertozzi