Merocyanines special

Cyanine and merocyanine dyes have also been tested as dye photosensitizers [132-137]. A nanocrystalline 2 solar cell sensitized by the special merocyanine dye as shown in Fig. 15 revealed a good efficiency of 4.2-4.5% (7 =... 

Of particular interest are the intramolecularly ionic meropolymethine dyes (especially the merocyanines), whose electronic structure lies somewhere between that of polyenes and that of polymethines depending on the nature of X and X as well as on solvent polarity [20], These are systems in which an electron-donating group, D, is linked by a conjugated system, R, to an electron-accepting group, A. Their intermediate r-electronic structure can be described in terms of two mesomeric structures, D—R—A D —R—A , as, for example, this special vinylogous merocyanine dye ( = 0,1,2,...) ... 

---