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Titolo:
SPECTROSCOPIC EVIDENCE FOR PERTURBED NO DIMERS ON OXIDIZED MO(110)
Autore:
QUEENEY KT; PANG S; FRIEND CM;
Indirizzi:
HARVARD UNIV,DEPT CHEM,12 OXFORD ST CAMBRIDGE MA 02138 HARVARD UNIV,DEPT CHEM CAMBRIDGE MA 02138
Titolo Testata:
The Journal of chemical physics
fascicolo: 18, volume: 109, anno: 1998,
pagine: 8058 - 8061
SICI:
0021-9606(1998)109:18<8058:SEFPND>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
INFRARED REFLECTION-ABSORPTION; NITRIC-OXIDE; SUPPORTED CHROMIUM; RAMAN-SPECTRA; N2O FORMATION; ADSORPTION; REDUCTION; PDO-MOO3/GAMMA-AL2O3; SURFACES; CATALYSTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
K.T. Queeney et al., "SPECTROSCOPIC EVIDENCE FOR PERTURBED NO DIMERS ON OXIDIZED MO(110)", The Journal of chemical physics, 109(18), 1998, pp. 8058-8061

Abstract

We report herein the first direct experimental evidence of a nitric oxide dimer (NO)(2) which is significantly perturbed from gas- and condensed-phase (NO)(2) by bonding of one of the nitrosyls to a metal surface. Infrared reflectance absorbance spectroscopy of isotopically mixed overlayers is used to identify the formation of this species from NOadsorption on oxidized Mo(110) and to characterize it as a second-layer NO[nu((NO)-N-14) =1871 cm(-1)] bound to a surface nitrosyl [nu((NO)-N-14) = 1728 cm(-1)]. The spectroscopic signature of this species is a small (similar to 8 cm(-1)) splitting of nu(NO) of each of the nitrosyls upon isotopic mixing, rather than the appearance of three different frequencies for nu(s)(NO) and nu(a)(NO). The formation of such a dimer on oxidized Mo(110) does not result in N-N bond formation, in contrast to the evolution of both N-3 and N2O via a dinitrosyl intermediate on the same surface. This result suggests that, on surfaces which interact strongly enough with NO to form chemisorbed nitrosyls stable above room temperature, N-N bond formation is favored by surface-bondingof both nitrosyls, rather than coupling via the weak N-N bond of a condensed-phase type (NO)(2) dimer. (C) 1998 American Institute of Physics. [S0021-9606(98)70142-4]

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 04:04:08