Darstellung und spektroskopische Charakterisierung von Di(halogeno)phthalocyaninato(1–)rhodium(III), [RhX2Pc1−] (X = Cl,Br, I) |
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Authors: | G Ostendorp S Sievertsen H Homborg |
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Abstract: | Synthesis and Spectroscopical Characterization of Di(halo)phthalocyaninato(1–)rhodium(III), RhX2Pc1?] (X = Cl, Br, I) Bronze-coloured di(halo)phthalocyaninato(1–)-rhodium(III), RhX2Pc1?] (X = Cl, Br) and RhI2Pc1?] · I2 is prepared by oxidation of (nBu4N)RhX2Pc2?] with the corresponding halogene. Irrespective of the halo ligands, two irreversible electrode reactions due to the first ringreduction (ER = ?0,90 V) and ringoxidation (EO = 0,82 V) are present in the cyclovoltammogram of (nBu4N)RhX2Pc2?]. The optical spectra show typical absorptions of the Pc1?-ligand at 14.0 kK and 19.1 kK. Characteristic vibrational bands are at 1 366/1 449 cm?1 (i. r.) and 569/1 132/1 180/1 600 cm?1 (resonance Raman (r. r.)). The antisym. (Rh? X)-stretching vibration is observed at 294 cm?1 (X = Cl), 240 cm?4 (Br) and 200 cm?1 (I). Only the sym. (Rh? I)-stretching vibration at 133 cm?1 is r. r. enhanced together with a strong line at 170 cm?1, which is assigned to the (I? I)-stretching vibration of the incorporated iodine molecule. Both modes show overtones and combinationbands. |
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Keywords: | Phthalocyanines(1– ) RhIII complex cyclovoltammetry optical spectra vibrational spectra |
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