The two liquid phase system NaAl(ethyl)4 – benzene–HMPA

Autor:	M. C. Day, James H. Medley, Naseer Ahmad
Rok vydání:	1985
Předmět:	chemistry.chemical_compound Ternary numeral system chemistry TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY Sodium Organic Chemistry Inorganic chemistry Liquid phase chemistry.chemical_element General Chemistry Benzene Catalysis
Zdroj:	Canadian Journal of Chemistry. 63:2906-2914
ISSN:	1480-3291 0008-4042
Popis:	A detailed study of complexation of the sodium ion by HMPA2 has been made using the system[Formula: see text]where HMPA is observed to be a strong donor towards Na+ but does not complex AlEt4−. This system forms two liquid phases at low HMPA:Na+ molar ratios with the salt and the HMPA, up to a 4:1 HMPA:Na+ ratio, occurring only in the lower phase. Based on a variety of experimental techniques, reasonable proposals of the solute species in the lower phase as a function of HMPA:Na+ ratio are presented. A 2.5:1 ratio of HMPA:Na+ is observed to be particularly significant. This ratio is rationalized in terms of a bridging HMPA molecule resulting in a cationic species with the stoichiometry [2Na•5HMPA]2+. It is found that the 27Al and 1H nmr spectra are determined primarily by quadrupole relaxation of the 27Al nucleus rather than by exchange.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a5b9f987178f9cf6fdd8436ed0fff37c https://doi.org/10.1139/v85-482 Zobrazit plný text záznamu