Abstract
A pyridine containing BINOL-based aldehyde (S)- or (R)-4 is found to show highly enantioselective fluorescent response toward phenylglycinol in the presence of Zn2+. A chirality matched dimeric BINOL-imine-Zn(II) complex is isolated from the reaction of (S)-4 with l-phenylglycinol and Zn2+ whose structure is established by X-ray analysis. Comparison of the structure of this SS-complex with a molecular modeling structure of the chirality mismatched SR-complex generated from the reaction of (S)-4 with d-phenylglycinol has provided important insight into the origin of the observed highly enantioselective fluorescent response. It is found that the solvent-accessible surface area of the chirality-matched SS-complex is much smaller than that of the chirality mismatched SR-complex, which gives the more tightly packed and structurally rigid SS-complex with greatly enhanced fluorescence.
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