Issue 3, 2015

Dielectric properties and electronic absorption: a comparison of novel azo- and oxo-bridged phthalocyanines

Abstract

The novel two homologous phthalocyanine (Pc) series (azo- and oxo-bridged) substituted with a 5-bromo-2-methoxyphenyl moiety were synthesized and characterized. The physical and chemical properties of the Pcs were compared with each other for the first time. The ac response of the Pcs was also studied by impedance measurements over a temperature range of 300–500 K. The real and imaginary parts of the impedance were found to be dependent on both frequency and temperature. The impedance spectra of the samples displayed semicircular arcs in the complex plane plot at all temperatures, with their centres lying below the real axis at a particular angle of depression indicating the distribution of relaxation times. Measurements showed that the dielectric permittivity of azo-bridged phthalocyanines is significantly higher than that of the oxo-bridged homologs. This result can be attributed to the limited electron delocalization ability of oxo-bridged homologs.

Graphical abstract: Dielectric properties and electronic absorption: a comparison of novel azo- and oxo-bridged phthalocyanines

Supplementary files

Article information

Article type
Paper
Submitted
28 Sep 2014
Accepted
08 Nov 2014
First published
12 Nov 2014

Dalton Trans., 2015,44, 1397-1405

Author version available

Dielectric properties and electronic absorption: a comparison of novel azo- and oxo-bridged phthalocyanines

M. Merve Yüzüak, S. Altun, A. Altındal and Z. Odabaş, Dalton Trans., 2015, 44, 1397 DOI: 10.1039/C4DT02998D

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