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Synthesis and vibrational analysis of a locked 14-s-cis conformer of retinal

A 12-N-ethano retinal Schiff base is synthesized to study the vibrational properties of a C 14 -C 15 s-cis conformer of retinal. The synthesis of the 12-N-ethano retinal Schiff base and seven of its isotopomers is described. Raman and FTIR spectra of this compound and its isotopic derivatives are analyzed and the normal mode assignments compared to MNDO normal coordinate calculations