• Uma Shivkumar

      Articles written in Bulletin of Materials Science

    • Mesogenic β-diketones and metallonematogens

      Archana Ghode Uma Shivkumar B K Sadashiva

      More Details Abstract Fulltext PDF

      Several new liquid-crystalline materials have been synthesized and their properties investigated. These belong to a series ofβ-diketones containing different terminal substituents. Mesophases of the smectic C, smectic A and nematic types have been observed in theseβ-diketones. Using these ligands many copper(II) and palladium(II) complexes have also been synthesized and their mesogenic behaviour characterized. Microscopic observations and differential scanning calorimetric measurements show that these chelates exhibit the nematic phase. The DSC data also indicate that the nematic phase of the ligands and complexes is associated with very low clearing transition enthalpies. All the metallonematogens reported are enantiotropic in nature.

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