Paramagnetic liquid-crystal side-chain polyacrylates containing Schiff base copper (II) complexes

Autor:	Pablo J. Alonso, Jesús I. Martínez, Eduardo Campillos, Mercedes Marcos, José Luis Serrano
Rok vydání:	1996
Předmět:	Schiff base Chemistry Mesogen chemistry.chemical_element Mesophase General Chemistry Copper Thermotropic crystal law.invention chemistry.chemical_compound law Liquid crystal Polymer chemistry Materials Chemistry Side chain Electron paramagnetic resonance
Zdroj:	Journal of Materials Chemistry. 6:533
ISSN:	1364-5501 0959-9428
DOI:	10.1039/jm9960600533
Popis:	Polymers containing Schiff base copper complexes were synthesized from thermotropic liquid-crystalline polyacrylates containing a mesogenic bidentate Schiff base as the side chain. The introduction of the copper atoms (5–65 mol%), gave rise to cross-linked polymeric chains, and the copper content of the polymers was determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES). The liquid-crystal properties were examined by differential scanning calonmetry (DSC), polarizing microscopy and electron paramagnetic resonance (EPR) spectroscopy. The mesophases of the original polyacrylate are enantiotropic smectic A and smectic C, whereas polymers containing the bis(Schiff base)copper(II) complex in different proportions exhibit an enantiotropic smectic C mesophase. The EPR measurements of this type of copper-coordinated polymer at different temperatures indicate a restricted motion of the copper complex around the long molecular axis and provided information on the local order of the molecules in the liquid-crystal phase
Databáze:	OpenAIRE
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