Fig. 1. (a) Molecular structure of ROY. Carbon atoms are shown in black, nitrogen in blue, oxygen in red, sulfur in yellow, and hydrogen in white. The two rotatable bonds τSCNC and τCNCC that can influence intramolecular conjugation are indicated. (b) An alternate measure of the extent of ring coplanarity; the angle θ between mean planes calculated through the phenyl and thiophene groups.
