Halogen bond induced room temperature phosphorescence from 3,5′-diiodo-2,2′-bithiophene-5-carboxaldehyde

Abstract

Phosphorescent materials from small organic molecules at ambient conditions are very useful as they possess major applicability in diverse fields including light emitting diodes, security and data encryption/decryption, sensing, bioimaging and biomedical sciences. 3,5′-diiodo-2,2′-bithiophene-5-carboxaldehyde exhibited solid state room temperature phosphorescence which was triggered by halogen bond. X-ray crystallography revealed the existence of intermolecular C–I⋯O type halogen bonding interaction. Notably, the compound, 3,5′-diiodo-2,2′-bithiophene-5-carboxaldehyde, did not show phosphorescence in solution state and upon doping in polymer matrix.