The case of infrared carbonyl stretching intensities of 2-bromocyclohexanone: Conformational and intermolecular interaction insights

► The first infrared spectrum of 2-bromocyclohexanone in the vapor phase. ► The IR behavior is different from expected theoretically for the isolated state. ► 2-Bromocyclohexanones experiences self-association even in the vapor phase. ► The difference of CO molar absorptivities between conformers is significant.