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IR and UV-vis spectral properties of azametallacrown complexes containing Mn(III), Fe(III) or Co(III) were investigated. The relation between the main IR bands in 400-4 000 cm-1 and the structure of azametallacrown complexes were discussed. The absorption bands of ν(C=O), ν(NH), δ(NH) + ν(CN) and δ(NH) which existed in the IR spectra of the ligands disappeared in the (formula percentage) IR spectra of the complexes. A strong band found at -1 600 cm-1 is assigned to group. Bands at ∼ 1 560 cm-1 and -1 410 cm-1 are attributed to ν(C=N) and ν(CO), respectively. These results suggest that the ligands in solid state may exit as keto form, and the ligands in the solution may first undergo isomerization to enol form and then coordinated to metal centers through deprotonation. The bands found at -204 and 220-256 nm can be assigned to π-π*' or π-π* transitions of the π conjugation in (formula percentage) framwork and benzene ring. The absorption maxima at 274-350 nm could be assigned to metal-to-ligand charge transfer (MLCT) transition. The d-d transition band for the metal atoms was observed at -500 nm.
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Spectroscopy and Spectral Analysis
ISSN: 1000-0593
Year: 2002
Issue: 6
Volume: 22
Page: 962-
0 . 2 9 3
JCR@2002
0 . 7 0 0
JCR@2023
JCR Journal Grade:4
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 0
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