Conductivity and electron density of undoped model compounds of poly(phenylene vinylene)
| Autor: | H. J. Geise, L. Van 't dack, G Debrue, E.J. Sonneveld, J.W. Visser, Renaat Gijbels, Z. Yang, Mohammad Mehbod |
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| Přispěvatelé: | Technisch Physische Dienst TNO - TH |
| Jazyk: | angličtina |
| Rok vydání: | 1990 |
| Předmět: |
Electron density
Materials science Polymers Mechanical Engineering Metals and Alloys Ionic bonding Electron Crystal structure Chromophore Conductivity Condensed Matter Physics Synthetic Compounds Electronic Optical and Magnetic Materials Poly(Phenylene Vinylene) Compounds chemistry.chemical_compound Chemistry chemistry Mechanics of Materials Phenylene Polymer chemistry Materials Chemistry Thiophene Physical chemistry Electrons--Density Measurement |
| Zdroj: | Synthetic metals Synthetic Metals, 2, 39, 137-151 |
| ISSN: | 0379-6779 |
| Popis: | Fourteen derivatives of trans,trans-1,4-bis[2-phenylethenyl]benzene were synthesized by Wittig reactions as model compounds of poly(paraphenylene vinylene). Structure, configurational homogeneity and absence of ionic impurities were controlled by mass spectrometry, infrared and neutron activation analysis, respectively. Crystallographic unit cell parameters were obtained from X-ray powder patterns and measurements of electrical conductivities were performed on undoped samples. The data of four more compounds containing one or more thiophene rings instead of phenyl rings were added from the 3iterature. If NO2 and Cl groups are excluded from the electron count a good linear correlation is found between the logarithm of the conductivity and the non-σ electron density (View the MathML source). The position of the substituents, on the central or on the terminal ring, also plays a role in as much as it affects the molecular volume of the compound but not the non-σ electron density. The correlation between the logarithm of the conductivity and the absorption coefficient of the longest wavelength of UV absorption identifies the π electrons in the chromophore as the principal charge carriers. |
| Databáze: | OpenAIRE |
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