The two conformers of 11-cis-retinal Schiff base, one derived from the 12-s-cis the other from the 12-s-trans geometry, are found from temperature dependent u.v. and circular dichroism spectroscopies to undergo aggregation to chiral dimers; force-field calculations reveal the surprisingly different geometries of the aggregates in agrement with the spectral data.
V. Haas, U. Wingen and V. Buss, J. Chem. Soc., Chem. Commun., 1989, 1053 DOI: 10.1039/C39890001053
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