- The Liquid-Crystalline Properties of Copper(II) Complexes of β-Diketones
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The preparation of several novel copper(II) complexes of β-diketones is described.Complexes of increasing molecular width have been prepared and the effect of molecular shape on the mesophase types and transition temperatures is discussed.All the liquid-crystalline complexes exhibit nematic mesophases (monotropic for three-ring ligands and enantiotropic for four-ring ligands) with one exception which shows a smectic A phase.The liquid crystalline properties of the ligands are also discussed with respect to the way in which their molecular geometry affects the type of mesophase formed.Keywords: Copper(II) complexes, β-diketones, metallo-mesogens
- Thompson, Neil J.,Gray, George W.,Goodby, John W.,Toyne, Kenneth J.
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p. 109 - 132
(2007/10/02)
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- Mesomorphic Properties of a Homologous Series of Aryl β-Diketones and a Few Related Derivatives
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A new homologous series of nine 1,3-diones have been prepared and their mesomorphic properties studied.The first four homologues in the series exhibit the classical nematic phase and a smectic phase, the next five showing only a smectic phase.The optical textures, miscibility and the X-ray data establish that the smectic phase is of the A1 type.This is perhaps the first instance of a β-diketone exhibiting a nematic as well as a smectic A1 phase.In addition, a few similar isomeric β-diketones have also been synthesized to study the terminal substituent effect on the mesomorphic properties.Keywords: β-diketone, smectic A phase, isomerism, substituent effect.
- Sadashiva, B. K.,Rao, P. Rani,Srikanta, B. S.
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p. 103 - 110
(2007/10/02)
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- Paramagnetic Nematic Liquid Crystals
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Five nematogenic complexes, bis-copper(II), have been prepared.The mesophase, which occurs monotropically in all of them, is of the usual nematic type, but has paramagnetic properties.Magnetic, dielectric and electron paramagnetic resonance measurements are presented.A preliminary analysis of the data indicates the existence of antiparallel correlations in the nematic phase.
- Chandrasekhar, S.,Sadashiva, B. K.,Srikanta, B. S.
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