Conformationally Distinct [26]Heterorubyrin(1.1.0.1.1.0) Macrocycles and Their Bis-BODIPYs: Synthesis, Structure, and Optical Properties.

Two conformationally different [26]rubyrin(1.1.0.1.1.0) macrocycles with varying heteroatoms (S/O) and their bis-BODIPYs are reported. The solid-state structure confirms O 2 N 4 with fairly planar pyrrole-inverted conformation, whereas a thiophene-inverted structure for S 2 N 4 is observed. Such conformational differences can also be clearly realized from their spectral and optical features. Upon BF 2 complexation, both rubyrins led to their respective bis-BODIPYs where S 2 N 4 -BOD displayed a perfectly planar conformation as evident from its X-ray structure.