Multinuclear NMR studies of mixtures of aluminium and gallium trihalides in benzene

Autor:	Bohuslav Čásenský, Jiří Macháek, Jiří Fusek, Dennis G. Tuck, Zbyněk Černý, Otomar Křīž
Rok vydání:	2001
Předmět:	Electronegativity NMR spectra database chemistry.chemical_compound chemistry Aluminium Inorganic chemistry chemistry.chemical_element Halide General Chemistry Gallium Benzene Mixing (physics)
Zdroj:	Journal of the Chemical Society, Dalton Transactions. :2698-2703
ISSN:	1364-5447 1472-7773
DOI:	10.1039/b102483n
Popis:	The 27Al and 71Ga NMR spectra of mixtures of M2X6 and M2Y6 (M = Al, Ga; X ≠ Y = Cl, Br or I) in benzene are reported. All these systems show rapid inter-halogen exchange, and in some cases stable intermediates M2XnY6 − n can be characterised spectroscopically. In particular, the results are used to identify the predominant species present in solutions prepared by mixing (i) Al2Br6 and Ga2Cl6, and (ii) Al2I6 and Ga2Br6, in benzene in various mole ratios. The expected M2X3Y3 intermediates are found for M = Al or Ga, X ≠ Y = Cl, Br, but with other mixed halide systems, unsymmetric structures predominate, and possible reasons for this are discussed. The experimental results are in agreement with thermodynamic predictions, and with arguments based on maximizing the M–X, Y electronegativity differences.
Databáze:	OpenAIRE
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