The electrical conductivity of doped oligo[aromatic diimidoselenide]

Six aromatic oligoazomethines were synthesized containing seven benzene rings each. The terminal rings were substituted with different groups, namely, H, Cl, NO2, OH, OCH3 and CH3. The synthesis was carried out by condensing the para‐substituted benzaldehydes with benzidine to give the three‐ring compound, which was then condensed with terephthaldehyde to give the respective seven‐benzene‐ring oligomers. The oligomers were characterized by elemental analysis, electronic spectra, Fourier‐transform infrared and thermal analysis. The oligomers were used to investigate the effects of their molecular structure on their electronic spectra, as well as their thermal, electronic and electrical properties. The different conformers were reported and compared. The DC electrical conductivity variation of oligoazomethines was studied in the temperature range 300–500 K after annealing for 24 h at 100 °C and after doping with 5% I2. An attempt was made to relate the DC electrical conductivity, electronic properties and thermal properties to the chain length, substituted groups and coplanarity. The fairly low conductivity obtained was attributed to the non‐linearity of the rings in the chain. The different groups (neutral, electron withdrawing or electron donating) attached at the ends of the oligomer showed no influence upon the conductivity of the different oligomers. The action of doping gave almost the same enhancement as that noticed in the case of a long‐chain polymer. The DC electrical conductivity was interpreted using the band energy model. The seven‐benzene‐ring oligomer gave the same DC electrical conductivity as the long‐chain polymer. Copyright © 2004 Society of Chemical Industry

show abstract

“…The electrical conduction measurements, annealing and doping were performed as described in previous publications 14–16…”

Section: Methodsmentioning

confidence: 99%

DC electrical conductivity of some oligoazomethines

El‐Shekeil

Al-Aghbari

2004

Polymer International

Self Cite

View full text Add to dashboard Cite

show abstract

“…Doping by the mixing of I 2 did not show a great enhancement of DC electrical conductivity. This may be attributed to the lack of formation of a charge transfer complex (32). Figure 3 shows DC electrical conductivity vs. 1000/T of all compounds doped with 25% and 50% MWNTs.…”

Section: Electrical Conductivitymentioning

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…The chemical doping of polypyrrole-zirconium complex did not show a great enhancement of DC electrical conductivity. This is attributed to the nonformation for any charge transfer complexes (20); the three dopants I 2 , FeCl 3 and CuCl 2 . 2H 2 O are similar in action and gave similar enhancement of electrical conductivity that did not respond to heat at high temperatures.…”

Section: Ftir Spectramentioning

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

View full text Add to dashboard Cite

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.

show abstract

The electrical conductivity of doped oligo[aromatic diimidoselenide]

Cited by 4 publications

References 15 publications

DC electrical conductivity of some oligoazomethines

DC electrical conductivity of some oligoazomethines

DC Electrical Conductivity of Some Oligoazomethines Doped with Nanotubes

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

Contact Info

Product

Resources

About