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À propos de : Optical Rotation of Noncovalent Aggregates        

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  • Optical Rotation of Noncovalent Aggregates
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  • Dilute solutions of (R)-(−)-pantolactone in CCl4 were studied by polarimetry in conjunction with theoretical calculations of [α]D. Our data demonstrate that the self-association of a chiral solute results in a change in [α]D that can be accounted for by the presence of hydrogen-bonded dimeric species. The theoretical analysis predicts a concentration-dependent specific rotation in good agreement with experiment. Further exploration of monomer and dimer [α]D differences, through atomic map analysis, reveals large contributions to [α]D from the hydrogen-bonded hydroxyl groups in the tightly-coupled dimer. This study extends the computation of chiroptical properties to the accurate concentration-dependent prediction of [α]D for noncovalently interacting self-associating species.
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