Semiconductivity,optical properties,and EPR spectra of phenothiazine derivatives in the solid state |
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Authors: | A. Ortiz J.I. Fernández-Alonso A. Pardo J. Llabrés |
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Affiliation: | Departmento de Quimica-Física y Química Cuántica, Centro Coordinado CSIC-UAM, Universidad Autonoma de Madrid, Cantoblanco, Madrid, 34, Spain;Departamento de Física Aplicada, Universidad Autónoma de Madrid, Cantoblanco, Madrid, 34, Spain |
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Abstract: | The optical, EPR, and electrical properties of phenothiazine derivatives have been investigated as a function of R2 substituents. Diffuse reflectance spectra show a charge transfer complex transition between 600 and 1100 nm. The EPR spectra show the existence of the radical cation with an unpaired electron per molecule; also there can be seen a dependence of the bandwidth on the R2 substituents. Measurements of electrical conductivity show a semiconductor behavior in the studied temperature range; the values show as well a dependence of conductivity on R2. The estimation of the drift mobility of charge carriers seems to indicate a hopping mechanism for the charge conduction. |
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