Azine-fused [6]carbohelicenes: synthesis, crystal structure, stereoisomerism and optical properties

Novel azine-fused [6]helicenes were prepared in five synthetic steps starting from commercially available 2,3-dihaloazines (2,3-dibromopyridine, 2,3-dichloropyrazine and 2,3dichloroquinoxaline). The X-ray structures, UV-vis absorption and fluorescence spectra of the helicenes were...