Nitrogen chemisorption on the coordinatively unsaturated Rh site on Al{sub 2}O{sub 3}

Journal Article · Wed Oct 23 00:00:00 EDT 1996 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja960303m· OSTI ID:420828

Wovchko, E A; Yates, Jr, J T ^[1]

---

1. Univ. of Pittsburgh, PA (United States)

The UV (3.8 eV) photolysis of atomically-dispersed Rh{sup I}(CO){sub 2} species supported on an Al{sub 2}O{sub 3} surface in the presence of N{sub 2} at 175 K caused the replacement of CO by N{sub 2} ligands. Therefore dinitrogen chemisorption effectively probes rhe coordinatively unsaturated Rh(CO) species generated during photodecomposition of Rh{sup I}(CO){sub 2}/Al{sub 2}O{sub 3}. Two infrared bands, observed at 2234 and 2048 cm{sup -1}, are attributed respectively to v{sub N(2)} and v{sub CO} in Rh(N{sub 2})(CO), and a band at 2188 cm{sup -1} is assigned to Rh(N{sub 2}){sub 2} surface species. The assignments are based on frequencies and the relative rates of spectral development for the two N{sub 2}-containing species. The Rh(N{sub 2}){sub 2} species on Al{sub 2}O{sub 3} exhibits identical N-N stretching modes to a similar species produced by matrix isolation methods. It is shown that both the Rh-CO bond and the Rh-N{sub 2} bond may be broken by photolysis. 51 refs., 7 figs., 2 tabs.

• OSTI ID: 420828
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 42 Vol. 118; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ALUMINIUM OXIDES
CARBONYLS
CATALYST SUPPORTS
CHEMISORPTION
DISSOCIATION
INFRARED SPECTRA
NITROGEN
PHOTOLYSIS
RHENIUM COMPOUNDS
ULTRAVIOLET RADIATION