Unprecedented detection of inherent chirality in uranyl-salophen complexes |
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Authors: | Dalla Cort Antonella Mandolini Luigi Palmieri Giovanni Pasquini Chiara Schiaffino Luca |
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Institution: | IMC-CNR, Università La Sapienza, Box 34-ROMA 62, 00185 Roma, Italy. |
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Abstract: | In complexes with the uranyl dication salophen ligands are highly puckered. This implies that non-symmetrically substituted uranyl-salophen derivatives exist in principle as a pair of enantiomers. However, due to easy disrotations about the bonds connecting the phenoxide units to the imine carbons, the rate of interconversion between enantiomeric forms of simple, sterically unhindered compounds is extremely fast. Bulky substituents in appropriate positions decrease the interconversion rate and make this novel type of inherent chirality detectable by 1H and 13C NMR. |
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