Temperature dependence of the electrical conductivity in 4, 4' bis(2-thenylideneamino)biphenyl and 4, 4' bis(thenyldiphenyl-phosphinylmethyleneamino)biphenyl compounds

• Published in: Journal of materials science 1999-06, Vol.34 (11), p.2715-2718
• Main Authors: EL-SAYED, B. A, EL-NAWAWY, M. A, ABD ELLAH, E. M, FARAG, R. S
• Format: Article
• Language: English
• Subjects: Activation energy; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Conductivity of specific materials; Electrical resistivity; Electronic transport in condensed matter; Energy gap; Exact sciences and technology; Materials science; Molecular structure; Nitrogen atoms; Physics; Pi-electrons; Polymers; organic compounds (including organic semiconductors); Temperature dependence; Ultraviolet spectra
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1023/A:1004685623739

Correlation of the molecular structure and utilizing measurements of the electrical conductivity, activation energy of conduction of 4,4′ bis(2-thenylideneamino)biphenyl (SB) and 4,4′ bis(thenyl-diphenylphosphinylmethyleneamino)biphenyl (OPSB) compounds have been carried out. The results of the activation energies, obtained from the electrical conductivity measurements, as well as the energy gaps calculated from ultraviolet (u.v.) and visible spectra in the solid state indicate that the investigated compounds behave like semiconducting materials. The delocalized π-electrons in addition to the lone pairs of electrons on the nitrogen atoms of the two compounds as well as the donor effect of diphenylphosphinyl groups of OPSB compound were considered as the main sources participating in the conduction processes.