FT-IR spectra of all sixteen isomers of retinal, their isolation, and other spectroscopic properties

Article abstract of DOI:10.1016/S0040-4020(01)89036-0

The FT-IR spectra of all sixteen isomers of retinal, their synthesis completed only recently, are reported. Characteristic trends of the polycis isomers (in C,C double bond, single bond and HOOP band regions) are discussed and compared with those of the mono-cis isomers. The 7-cis and 7,9-dicis isomers of three deuterioretinals (7D, 19,19,19,-D₃, and 8,19,19,19-D₄) have been prepared, confirming some of vibrational assignments. Conditions for purification of these isomers and other spectroscopic properties (¹H-NMR, UV/VIS) are also provided.