Facile preparative redox chemistry of bis(4-dialkylaminophenyl)squaraine dyes
摘要:
Bis(4-dialkylaminophenyl)squaraine dyes are readily reduced in solution by borohydride to give alkali soluble leuco compounds, which exist in the 3-hydroxy-2,4-(4-dialkylaminophenyl)cyclobutenone tautomeric form. The leuco dyes can be oxidised rapidly back to the squaraine dye, thus providing a means of temporarily solubilising the squaraine dye in water. The leuco compounds undergo Substitution reactions typical of vinylogous carboxylic acids. (C) 2002 Elsevier Science Ltd. All rights reserved.
A Phosphine-Mediated Dearomative Skeletal Rearrangement of Dianiline Squaraine Dyes
作者:Emily P. Bacher、Kevin J. Koh、Antonio J. Lepore、Allen G. Oliver、Olaf Wiest、Brandon L. Ashfeld
DOI:10.1021/acs.orglett.1c00248
日期:2021.4.16
A phosphorus(III)-mediated dearomatization of ortho-substituted dianiline squaraine dyes results in an unusual skeletalrearrangement to provide exotic, highly conjugated benzofuranone and oxindole scaffolds bearing a C3 side chain comprised of a linear conflagration of an enol, a phosphorus ylide, and 2,4-disubstituted aniline. Employing experimental and computational analysis, a mechanistic evaluation
Near-infrared-absorbing squaraine dyes containing 2,3-dihydroperimidine terminal groups
作者:Kasali A. Bello、S. Nigel Corns、John Griffiths
DOI:10.1039/c39930000452
日期:——
Condensation of 2,3-dihydroperimidines with squaric acid under conditions of azeotropic removal of water affords a new class of diarylsquaraine dyes with intense absorption bands at ca. 800nm.
Acid(g)/base(g)-controlled reversible Δν1/2 of absorption spectrum of a functional dye film
作者:Ha Lim Noh、Byeong M. Oh、Seungmin Baek、Sung-Ha Park、Gyeong G. Jeon、Sang Eun Yoon、Jian Zheng、O-Pil Kwon、Sang-Wook Kim、Jong H. Kim
DOI:10.1016/j.dyepig.2020.108457
日期:2020.9
determining the use of organic dyes for a particular application. For example, organic dyes with a relatively wide absorption FWHM are beneficial with respect to enhancing photon absorption efficiency of solar cells, whereas, for improving color purity in optical filters, narrow FWHM is desirable. Despite such a critical role, studies examining the modulation of absorption FWHM from an organic dye in the solid