On the detection by EXAFS spectroscopy of multimeric species and of complex anions in diethylether and diethylcarbonate

Autor:	J. Goulon, M. Chabanel, C. Goulon-Ginet
Rok vydání:	1981
Předmět:	Bromine Exafs spectroscopy Extended X-ray absorption fine structure Lithium bromide Inorganic chemistry Biophysics chemistry.chemical_element Biochemistry Spectral line Solvent chemistry.chemical_compound Crystallography chemistry Physical and Theoretical Chemistry Molecular Biology
Zdroj:	Journal of Solution Chemistry. 10:649-672
ISSN:	1572-8927 0095-9782
Popis:	EXAFS spectroscopy has been shown to be a reliable tool for detecting the formation in solutions of molecular associations (LiBr)n where n is solvent dependent. The signal Br*...Br observed at 3.87 A confirms the formation of tetrameric species (n=4) in diethylether (Et2O) but only of dimers (n=2) in diethylcarbonate. Another signal observed at 2.45 A has·been attributed to the pair Br*...Li. The study of Li2MBr4−Et2O solutions (M=Co, Cu, Zn) also affords new evidence for the formation of complex anions MBr 4′ 2− but the spectra obtained at the bromine or metalK-edges for LiZnBr3−Et2O solutions seems to indicate the formation of more complex aggregates (LiMBr3)q. While the signal of the shell Br*...Br is found quite intense for the reference CBr4−Et2O system, it does not appear for the MBr 4 2− complex except for CuBr 4 2− where the Jahn-Teller effect might rigidify a distorted tetrahedral structure.
Databáze:	OpenAIRE
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