Electrical and magnetic properties of liquid crystalline molecular materials: lithium and lutetium phthalocyanine derivatives

The synthesis and characterization of bis(phthalocyaninato)lutetium (Pc{sub 2}Lu) and lithium phthalocyanine (PcLi) substituted with long alkyl chains are reported. They form columnar liquid crystals over an extended domain of temperature. Oxidation of the lutetium derivative to the corresponding io...

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Bibliographic Details
Published in:Journal of physical chemistry (1952) 1989-11, Vol.93 (24), p.8105-8110
Main Authors: Belarbi, Z, Sirlin, C, Simon, J, Andre, Jean Jacques
Format: Article
Language:English
Subjects:
360603 - Materials- Properties
400000 - Chemistry
400400 - Electrochemistry
ALKALI METAL COMPOUNDS
Chemistry
Coordination compounds
CRYSTALS
DATA
DATA ANALYSIS
DYES
Exact sciences and technology
EXPERIMENTAL DATA
FLUIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
Inorganic chemistry and origins of life
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LIQUID CRYSTALS
LIQUIDS
LITHIUM COMPOUNDS
MATERIALS
MATERIALS SCIENCE
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MEASURING METHODS
MOLECULAR MODELS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SEMICONDUCTORS
PHTHALOCYANINES
Preparations and properties
SEMICONDUCTOR MATERIALS
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Summary:The synthesis and characterization of bis(phthalocyaninato)lutetium (Pc{sub 2}Lu) and lithium phthalocyanine (PcLi) substituted with long alkyl chains are reported. They form columnar liquid crystals over an extended domain of temperature. Oxidation of the lutetium derivative to the corresponding ionic compound (s-Pc{sub 2}Lu){sup +}, BF{sub 4}{sup {minus}} leads to a more stable mesophase. The magnetic properties of (s-Pc){sub 2}Lu are determined by electron paramagnetic resonance (EPR) spectra demonstrating the influence of the disorder on the EPR line width. Electrical properties of the solid and liquid crystalline phases have been measured in the frequency range 10{sup {minus}3}-10{sup 5} Hz. The intracolumnar order is shown to determine the frequency dependence of the conductivity: {omega}{sup 0.8} for the disordered columnar liquid crystalline phase and {omega}{sup 0.5} for the corresponding ordered one.
ISSN:0022-3654
1541-5740
DOI:10.1021/j100361a026