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Chromium(III) acetate, chromium(III) acetate hydroxide or μ3-oxo-esakis-(μ2-acetato-O,O')-triaqua-trichromium(III) acetate? Determining the structure of a complexe compound by analytical and spectroscopic methods.
Autorzy
Rok wydania
1997
Czasopismo
Numer woluminu
74
Strony
432-435
DOI
10.1021/ed074p432
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
An experiment illustrating the use of infrared spectroscopy and model compounds to elucidate the structure of chromium (III) acetate is reported. Two commercial samples with the following conventional formulations Cr3(CH3CO2)7(OH)2 and Cr(CH3CO2)3 were examined and compared to the model compound [Cr3(µ2-CH3COO)6(µ3-O)(H2O)3]DHB·2H2O, DHB = 2,6-dihydroxybenzoate(1-). The experiment may serve to illustrate the advantage of the joint application of analytical and spectroscopic data, in particular the use of symmetry concepts and IR-Raman selection rules, in the assignment of inorganic structures. All the samples exhibit the distinctive vibrational features predicted for a trimetallic carboxylate complex with the µ3-O-Cr3 cage. Therefore, it may be concluded that chromium (III) acetates are endowed with a trimetallic arrangement where six acetates bridge three metal ions connected by a triply-bridging oxygen so that a total of four carboxylate oxygens surround each chromium ion. Water molecules act as the terminal ligands and complete an almost regular octahedral coordination polyhedron at each metal center. Analytical data are in good agreement with the [Cr3(µ2-CH3COO)6(μ3-O)(CH3COO) composition.
Słowa kluczowe
Chromium, Analytical Chemistry
Adres publiczny
https://doi.org/10.1021/ed074p432
Strona internetowa wydawcy
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