SYNTHESIS, SPECTROSCOPIC,acCONDUCTIVITY AND THERMAL STUDIES ONCo(III) ACETYLACETONATE-IODINE COMPLEX

H. A. Hashem () and M. S. Refat
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H. A. Hashem: Physics Department, Faculty of Science, Zagazig University, Zagazig, 44519, Egypt
M. S. Refat: Chemistry Department, Faculty of Education, Port-Said, Suez Canal University, Port-Said, Egypt

Surface Review and Letters (SRL), 2006, vol. 13, issue 04, 439-449

Abstract: A spectrophotometric study of 1:1 donor–acceptor complex, cobalt (III) acetylacetonate (donor) and iodine (σ-acceptor) has been preformed. The equilibrium constants, (K) and the absorpitivity (ε) for the formation of the iodine complex have been calculated. The predicted structure of the solid triiodide charge-transfer complex reported in this study is further supported by thermal, far and mid infrared spectroscopic measurements. Electron transfer fromCo(acac = 2, 4-pentanedionate)3to iodine leads to the formation of an organic semiconductor with the formula of$[{\rm Co}({\rm acac})_3]_2{\rm I}^+.{\rm I}_3^-$. The kinetic parameters (nonisothermal method) for their decomposition have been evaluated by graphical methods using the equations of Freeman–Carroll (FC), Horowitz–Metzger (HM) and Coats–Redfern (CR). The ac conductivity and dielectric properties of$[{\rm Co}({\rm acac})_3]_2{\rm I}^+.{\rm I}_3^-$have been measured over the frequency 50–106Hz at temperature 298 K.

Keywords: Cobalt (III) acetylacetonates; infrared; triiodide; TGA; kinetic parameters; ac conductivity; dielectric properties; 52.25.Mq; 74.25.Fy; 33.20.Ea; 95.30.Tg (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1142/S0218625X06008414

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