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À propos de : Rigid Chiral Building Blocks for Copper(II)- andPalladium(II)-Containing Liquid Crystals        

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  • Rigid Chiral Building Blocks for Copper(II)- andPalladium(II)-Containing Liquid Crystals
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  • The possibility of metal coordination in oxazolinyl phenols has allowed the preparation ofnew chiral metal-containing liquid crystals in which the stereogenic center is located in therigid mesogenic core. By using (S)-β-amino alcohols as chiral starting materials for thesynthesis of the oxazoline ligands, two types of complex have been prepared: (i) mononuclearcopper(II) complexes and (ii) dinuclear orthopalladated organometallic compounds with eithernonplanar (acetato-bridged) or planar (chloro-bridged) geometries. The synthesis andstructural characterization of all of these compounds are described. The formation of a singlediastereoisomer with a trans configuration in nonplanar palladium(II) complexes has beenconfirmed by 1H NMR spectroscopy. The complexes mainly show SA mesomorphism, althoughwhen they are used as chiral dopants in a matrix with the phase sequence N−SA−SC theyinduce a cholesteric mesophase. The presence of stereogenic centers lying out of thecoordination plane in a rigid environment must account for the formation of the helicalcholesteric mesophase over broad temperature ranges.
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