Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Interaction of tetrameric silver with ammonia in AgCs-rho zeolite
Autore:
Sadlo, J; Danilczuk, M; Michalik, J;
Indirizzi:
Univ Ghent, Dept Solid State Sci, B-9000 Ghent, Belgium Univ Ghent GhentBelgium B-9000 t Solid State Sci, B-9000 Ghent, Belgium Inst Nucl Chem & Technol, PL-03195 Warsaw, Poland Inst Nucl Chem & Technol Warsaw Poland PL-03195 PL-03195 Warsaw, Poland
Titolo Testata:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 9, volume: 3, anno: 2001,
pagine: 1717 - 1720
SICI:
1463-9076(2001)3:9<1717:IOTSWA>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-SPIN-RESONANCE; CLUSTERS; ECHO; ESR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Sadlo, J Univ Ghent, Dept Solid State Sci, Krijgslaan 281-S1, B-9000 Ghent, Belgium Univ Ghent Krijgslaan 281-S1 Ghent Belgium B-9000 Ghent, Belgium
Citazione:
J. Sadlo et al., "Interaction of tetrameric silver with ammonia in AgCs-rho zeolite", PHYS CHEM P, 3(9), 2001, pp. 1717-1720

Abstract

Cationic silver clusters formed in gamma -irradiated AgCs-rho zeolite havebeen studied by EPR spectroscopy. Tetrameric silver is formed efficiently in the dehydrated form of zeolite as well as in samples exposed to ammonia. However, the hyperfine splitting of the Ag-4(3+) pentet in AgCs-rho/NH3 zeolite is distinctly smaller due to the shift of spin density from silver tonitrogen nuclei, suggesting the formation of an Ag-4(3+)-ammonia complex. The observed N-14 and N-15 superhyperfine splitting from interacting (NH3)-N-14 and (NH3)-N-15 molecules unequivocally proved the presence of a multicore Ag-4(3+)(NH3)(n) complex. Based on the simulation of N-14 and N-15 superhyperfine interactions a structure of the complex was proposed in which two ammonia molecules are located close to the octagonal windows of two neighboring alpha -cages and four further molecules are placed in next-neighboring alpha -cages interacting with the Ag tetramer through square windows. When dehydrated AgCs-rho zeolite containing radiation-induced Ag-4(3+) clusters is exposed to ammonia the Ag hyperfine splitting of silver tetramer decreases from 13.9 to 10.7 mT proving that Ag-4(3+) clusters are located in the sites accessible to adsorbates.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 04:57:32