Dipolar and V-shaped structures incorporating methylenepyran and diazine fragments

Thirteen novel dipolar and V-​shaped chromophores with pyranylidene electron-​donating part, diazine electron-​withdrawing part and various π-​linkers were synthesized. The extent of intramol. charge transfer, structure-​property relationships and optical properties were further investigated by UV​/Vis absorption, electrochem., and DFT calcns.