Indolizine-Cyanine Dyes: Near Infrared Emissive Cyanine Dyes with Increased Stokes Shifts
作者:Jacqueline Gayton、Shane A. Autry、William Meador、Sean R. Parkin、Glake Alton Hill、Nathan I. Hammer、Jared H. Delcamp
DOI:10.1021/acs.joc.8b02521
日期:2019.1.18
Molecular engineering strategies designed to red-shift cyanine dye absorptions and emissions further into the near-infrared (NIR) spectral region are explored. Through the use of a novel donor group, indolizine, with varying cyanine bridge lengths, dye absorptions and emissions, were shifted deeper into the NIR region than common indoline-cyanines. Stokes shifts resulting from intramolecular steric
探索了旨在将花青染料的吸收和发射进一步红移到近红外(NIR)光谱区域的分子工程策略。通过使用新的供体基团,具有不同花青桥长度,染料吸收和发射的吲哚利嗪比普通的吲哚啉-花青素更深地进入了近红外区域。在许多情况下,观察到并解释了由高达60 nm的分子内空间相互作用引起的斯托克斯位移。在近红外区域观察到高达5800的分子亮度。探索了六种具有不同花青桥长度和吲哚并取代基的吲哚并菁花青染料的结构-性质关系,它们显示出广泛的吸收和发射可调性。染料的特征在于晶体学,并通过不同的溶剂探测光物理性质,以进行吸收和发射研究。计算数据表明整个indolizineπ系统在光吸收过程中都参与其中,这表明通过选择衍生化,这些系统甚至可以进一步调谐到NIR区域中。