217655-15-7Relevant academic research and scientific papers
Bathochromic or hypsochromic effects via the extension of conjugation: A study of stilbenoid squaraines
Meier, Herbert,Petermann, Ralf,Gerold, Juergen
, p. 977 - 978 (1999)
In contrast to normal conjugated oligomers, the stilbenoid squaraines 3a-d do not show a convergence of VIS/NIR absorption due to the extension of conjugation; the observed bathochromic effect in the beginning of the series is followed by a hypsochromic e
Extended conjugation in stilbenylsquaraines
Meier, Herbert,Petermann, Ralf,Dullweber, Uta
experimental part, p. 744 - 754 (2011/10/12)
Unsymmetrical 1-aryl-3-stilbenylsquaraines 2a-e and 1,3-bis(stilbenyl)squaraines 3a-c were prepared by CC coupling reactions of the corresponding substituted arenes with derivatives of squaric acid (Schemes 2 and 3). Dialkylamino and alkoxy groups enhance the solubility of these dyes and enlarge the intramolecular charge transfer of these donor-acceptor-donor systems. The extended conjugation of the stilbene units - in comparison with arene building blocks - leads to significant bathochromic shifts in the Vis/NIR absorption spectra.
