NIR Absorbing Squaraines by Extension of the Conjugation with (Aminothiazolyl)ethenyl Groups
作者:Herbert Meier、Ralf Petermann
DOI:10.1002/hlca.200490101
日期:2004.5
The bis4-2-[2-(dialkylamino)thiazol-5-yl]ethenyl}-2,6-dihydroxyphenyl}squaraines 12a,b were synthesized from ethyl carbonochloridate (1) in six steps (Scheme). The donor–acceptor–donor systems 12a,b are dark blue dyes with absorption maxima in the NIR region, unless the measurements are performed in the presence of EtOH. In the latter case, the long-wavelength band disappears, and the absorption
由碳酰氯乙酯(1)以六个步骤(方案)合成了双4- 2- 2- [2-(二烷基氨基)噻唑-5-基]乙烯基} -2,6-二羟基苯基} squarains 12a,b。供体-受体-供体系统12a,b是深蓝色染料,在NIR区域具有最大吸收,除非在存在EtOH的情况下进行测量。在后者的情况下,长波长带消失,并且在UV区域中的吸收被强烈地增强。CHCl 3和CHCl 3中的λ最大值/ EtOH相差超过450 nm。完全可逆的作用可以通过分子内氢键的可逆降解以及受体和供体部分之间的由此引起的扭转来合理化。