217655-10-2Relevant articles and documents
Extension of Conjugation Leading to Bathochromic or Hypsochromic Effects in OPV Series
Meier, Herbert,Gerold, Juergen,Kolshorn, Heinz,Muehling, Bastian
, p. 360 - 370 (2007/10/03)
Four OPV series 1-4 (a-d) with a terminal dialkylamino group as electron donor were prepared by Wittig-Horner reactions. To study the influence of the push-pull effect on the long-wavelength absorption, three of the four series contained terminal acceptor
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.