Solid-state IR-LD spectroscopy of codeine and N-norcodeine derivatives

摘要

Linear-dichroic infrared spectra(IR-LD)of 3-ethoxy-4-(N-norcodeino-)cyclobutene-1,2-dione (1)and codeine dihydrogenphosphate(Codeinum phosphoricum)(2),oriented as solid suspensions in nematic liquid crystals,have been measured.IR characteristic band assignments were made,and used in stereo-structural predictions.The results were compared with crystallographic structures of similar organic systems,and found to be in good agreement.