Mesogenic β-diketones and metallonematogens

Autor:	Archana Ghode, Uma Shivkumar, B. K. Sadashiva
Rok vydání:	1994
Předmět:	Materials science Stereochemistry Mesogen chemistry.chemical_element Copper Crystallography β diketone chemistry Mechanics of Materials Liquid crystal Phase (matter) General Materials Science Chelation Palladium
Zdroj:	Bulletin of Materials Science. 17:283-297
ISSN:	0973-7669 0250-4707
DOI:	10.1007/bf02745179
Popis:	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.
Databáze:	OpenAIRE
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