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Three aromatic oligoazomethines containing seven benzene rings each were synthesized. The terminal rings were substituted with different organic groups; namely, OH, H, and NO 2 . Synthesis was carried out according to the literature by condensing the parasubstituted benzaldehydes with benzidine to give the three rings compound, which is then condensed with terephthaldehyde to give the respective seven benzene rings oligomer. The oligomers were used to investigate the effects of molecular structure on the electronic structure, as well as electronic and electrical properties. DC electrical conductivity variation of oligoazomethines is studied in the temperature range 300-500 K after annealing for 24 h at 100 • C and after doping with 25 and 50 wt% Multi Wall Nanotubes (MWNTs). An attempt is made to relate DC electrical conductivity and electronic properties to chain length, substituted groups and coplanarity. The different groups attached to the ends showed a small effect on conductivity of the different oligomers in the following order: electron donating > neutral > electron withdrawing groups. Oligoazomethines-MWNTs gave a value of (10 −4 Scm −1 ) as the highest electrical conductivity at higher temperatures. DC electrical conductivity was interpreted using the band energy model. The narrow-gap activation energies noted suggest its application in formulation of photovoltaic panels.

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“…The electrical conduction measurements, annealing and doping were performed as described in previous publications (27,28).…”

Section: Electrical Conductivity Measurementsmentioning

confidence: 99%

DC Electrical Conductivity of Some Oligoazomethines Doped with Nanotubes

Obeid

Al‐Shuja'a

Aqeel

et al. 2012

Journal of Macromolecular Science, Part A

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“…The thermal analyses (TGA and DSC) were carried out on STA 625 at 25 to 6258C under 30 ml nitrogen per minute and a heating rate of 108C per min. The electrical conduction measurements and annealing were performed as described previously (17,18).…”

Section: Instrumentationmentioning

confidence: 99%

The Synthesis, Characterization and DC Electrical Conductivity of Polypyrrole‐Zirconium Complex

El‐Shekeil

Abid

Al‐Shuja'a

2006

Journal of Macromolecular Science, Part A

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Polypyrrole-zirconium complex has been synthesized by reacting 2-amino-3,4-dicyano-5-mercaptopyrrole with zirconium nitrate in absolute ethanol under reflux for 24 h. The product has been characterized by elemental analyses, FTIR spectroscopy, in addition to thermal analysis (TGA and DSC) and its solubility has been investigated. The DC electrical conductivity variation of polypyrrole-zirconium complex has been studied in the temperature range 300-500 K after annealing for 24 h at 1008C and doping with I 2 , FeCl 3 and CuCl 2 . H 2 O for comparison. An attempt has been made to interpret the DC electrical conductivity behavior and thermal properties to chain length, dopant used, polymer structure and attached groups.

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“…As a continuation of our interest in conducting polymers,13–15 the objective of this study is: (i) to synthesize the PATS, (ii) To shed some light on the DC electrical conductivity of the pure and doped polymers, (iii) to investigate the ability of the polymer ligand to form metal‐chelates with metals under study, (iv) to study the structure‐property relationship of the polymer and its metal complexes.…”

Section: Introductionmentioning

confidence: 99%

DC electrical conductivity of polyazomethinethiosemicarbazone metal complexes

El‐Shekeil

Al‐Yusufy

Abdulla

2010

J of Applied Polymer Sci

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Polyazomethinethiosemicarbazone (PATS) metal complexes of Ni(II), Co(II), Cu(II), Zn(II), Cd(II) and Hg(II) metal ions were prepared by reacting the polymer ligand (PATS) with the appropriate metal salt in refluxing DMSO. Elemental analyzes as well as FTIR and electronic spectral data are presented to confirm the formulation of the isolated materials. The spectral data show that the ligand polymer is bonded to the metal ions via the thiol sulfur atom and coordinated through the nitrogen of azomethine group. The DC electrical conductivity measurements of PATS and its metal complexes were measured in the range 300-500 K in the annealed and 5% iodine doped forms. The products gave electrical conductivity in the semiconducting region that increased by heat. The DC electrical conductivity is interpreted using the band gap theory using solitons, polarons and bipolarons.

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Cited by 14 publications

References 8 publications

DC Electrical Conductivity of Some Oligoazomethines Doped with Nanotubes

DC Electrical Conductivity of Some Oligoazomethines Doped with Nanotubes

The Synthesis, Characterization and DC Electrical Conductivity of Polypyrrole‐Zirconium Complex

DC electrical conductivity of polyazomethinethiosemicarbazone metal complexes

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