Affiliation:
1. Institut für Anorganische Chemie,Universität Regensburg, D-93040 Regensburg, Germany
Abstract
The electronic spectra of bromo complexes of main group metal ions with an s2 electronic configuration (SnBr3
-, PbBr3
-, PbBr4
2-, SbBr4
-, SbBr6
3-, BiBr4
-, BiBr6
3-) in acetonitrile show long-wavelength absorption bands which are assigned to metal-centered sp transitions. Compared to the corresponding chloro complexes the sp bands of the bromo complexes appear at longer wavelength due to sp/LMCT mixing (LMCT = ligand-to-metal charge transfer). As a result of this mixing the luminescence which originates from low-energy sp excited states is much weaker than that of the chloro complexes. Moreover, some of the bromo complexes (e.g. BiBr4-) undergo a photochemical redox decomposition induced by LMCT excitation.
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68 articles.
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