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Electronic spectroscopy - Homoleptic chromium(III) complexes and the spectrochemical series.
Member rating: No Rating | Words: | Submitted: Tue Apr 06 2004
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1 November 2003 Experiment 1: Electronic spectroscopy - Homoleptic chromium(III) complexes and the spectrochemical series The metal d orbitals in an octahedral transition complex are split into two energy sets, t2g (lower) and eg (higher), as a result of metal-ligand interactions. The size of the energy gap, ?O, depends on various factors related to the actual nature of the metal and the ligands. For a single metal in a single oxidation state, the magnitude of ?O depends largely on the ligands present; a range of complexes of such a metal can be investigated by spectroscopy, in which the frequency of the absorption maxima correlates to the magnitude of the crystal field parameter, ?O. In this experiment, three homoleptic (single ligand-type) octahedral complexes of chromium(III) will be prepared, and their UV spectra compared in order to construct a spectrochemical series showing the magnitude of ?O caused by different ligands. An unknown complex...
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