The hydrogen-bridged dimier of a chiral 13-cis-retinal Schiff's base has been prepared and characterised by UV and circular dichroism (CD) spectroscopy; the CD spectrum is almost enantiomeric to that of the corresponding all-trans-retinal Schiff's base dimer pointing to the importance of chromophore shape to through-space interaction.
V. Haas and V. Buss, J. Chem. Soc., Chem. Commun., 1991, 1320 DOI: 10.1039/C39910001320
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