Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes The synthesized Schiff base ligand 8-hydroxyquinoline-7-formylidene-4-amino-1-phenyl-2,3-dimethylpyrazolin-5-one (SQL) and its Cu(II), VO(IV) and UO2(II) complexes are characterized by various physicochemical techniques. The thermal properties, dielectric properties, alternating current conductivity (σ ac) and conduction mechanism of SQL and its complexes (1–6) are investigated in the frequency range of 0.1–100 kHz and temperature range 298–583 K. The temperature and frequency dependence of the real and the imaginary part of the dielectric constant are studied. The values of the thermal activation energy of conduction mechanism for SQL and its complexes under investigation are calculated at different test frequencies, and found to be in the range 0.0023–0.0798 eV for ΔE 1 and 0.0897–1.296 eV for ΔE 2. The ac conductivity, σ ac, is related to the frequency as σ ac α ω S where the behavior of the exponent S with temperature determines the operating conduction mechanism. The correlated barrier hopping model is found to be the dominant conduction mechanism for SQL and its complexes (1) and (3–5), and the values of the maximum barrier height (W m) are calculated for SQL and its complexes (1) and (3–5). The quantum–mechanical tunneling is the dominant conduction mechanism for complexes (2) and (6). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

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Publisher
Springer Journals
Copyright
Copyright © 2015 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-015-2164-5
Publisher site
See Article on Publisher Site

Abstract

The synthesized Schiff base ligand 8-hydroxyquinoline-7-formylidene-4-amino-1-phenyl-2,3-dimethylpyrazolin-5-one (SQL) and its Cu(II), VO(IV) and UO2(II) complexes are characterized by various physicochemical techniques. The thermal properties, dielectric properties, alternating current conductivity (σ ac) and conduction mechanism of SQL and its complexes (1–6) are investigated in the frequency range of 0.1–100 kHz and temperature range 298–583 K. The temperature and frequency dependence of the real and the imaginary part of the dielectric constant are studied. The values of the thermal activation energy of conduction mechanism for SQL and its complexes under investigation are calculated at different test frequencies, and found to be in the range 0.0023–0.0798 eV for ΔE 1 and 0.0897–1.296 eV for ΔE 2. The ac conductivity, σ ac, is related to the frequency as σ ac α ω S where the behavior of the exponent S with temperature determines the operating conduction mechanism. The correlated barrier hopping model is found to be the dominant conduction mechanism for SQL and its complexes (1) and (3–5), and the values of the maximum barrier height (W m) are calculated for SQL and its complexes (1) and (3–5). The quantum–mechanical tunneling is the dominant conduction mechanism for complexes (2) and (6).

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jul 12, 2015

References

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