Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Lithium-7 NMR study of several Li+-crown ether complexes in binary acetone-nitrobenzene mixtures
Autore:
Karkhaneei, E; Zebrajadian, MH; Shamsipur, M;
Indirizzi:
Razi Univ, Dept Chem, Khorramshahr, Iran Razi Univ Khorramshahr IranRazi Univ, Dept Chem, Khorramshahr, Iran Bou Ali Sina Univ, Dept Chem, Hamadan, Iran Bou Ali Sina Univ Hamadan Iran Ali Sina Univ, Dept Chem, Hamadan, Iran
Titolo Testata:
JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
fascicolo: 4, volume: 40, anno: 2001,
pagine: 309 - 312
SICI:
1388-3127(200108)40:4<309:LNSOSL>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUCLEAR-MAGNETIC-RESONANCE; MACROCYCLE INTERACTION; KINETIC DATA; ALKALINE-EARTH; LIGAND INTERCHANGE; NEUTRAL MOLECULES; EXCHANGE KINETICS; METHANOL SOLUTION; ION; ACETONITRILE;
Keywords:
acetone-nitrobenzene mixtures; Li+-crown; Li-7 NMR; stability; stoichiometry;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Shamsipur, M Razi Univ, Dept Chem, Khorramshahr, Iran Razi Univ Khorramshahr Iran Dept Chem, Khorramshahr, Iran
Citazione:
E. Karkhaneei et al., "Lithium-7 NMR study of several Li+-crown ether complexes in binary acetone-nitrobenzene mixtures", J INCL P MA, 40(4), 2001, pp. 309-312

Abstract

Li-7 NMR measurements were employed to monitor the stoichiometry and stability of Li+ ion complexes with 12-crown-4 (12C4), 15-crown-5 (15C5), benzo-15-crown-5 (B15C5) l8-crown-6 (18C6), dicyclohexano-18-crown-6 (DC18C6) anddibenzo-18-crown-6 (DB18C6) in binary acetone-nitrobenzene mixtures of varying composition. In all cases studied, the variation of Li-7 chemical shift with the crown/Li+ mole ratio indicated the formation of 1:1 complexes. The formation constants of the resulting complexes were evaluated from computer fitting of the mole ratio data to an equation that relates the observedchemical shifts to the formation constant. In all solvent mixtures used, the stabilities of the resulting 1:1 complexes varied in the order 15C5 > B15C5 > DC18C6 > 18C6 > 12C4 > DB18C6. It was found that, in the case of all complexes, an increase in the percentage of acetone in the solvent mixturessignificantly decreased the stability of the complexes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 12:27:18