Atomically resolved site-isolated catalyst on MgO: Mononuclear osmium dicarbonyls formed from Os 3(CO) 12

Ceren Aydin; Apoorva Kulkarni; Miaofang Chi; Nigel D. Browning; Bruce C. Gates

doi:10.1021/jz300574u

Atomically resolved site-isolated catalyst on MgO: Mononuclear osmium dicarbonyls formed from Os ₃(CO) ₁₂

Ceren Aydin, Apoorva Kulkarni, Miaofang Chi, Nigel D. Browning, Bruce C. Gates

electron Microscopy and Microanalysis

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Abstract

Supported triosmium clusters, formed from Os ₃(CO) ₁₂ on MgO, were treated in helium at 548 K for 2 h, causing fragmentation of the cluster frame and the formation of mononuclear osmium dicarbonyls. The cluster breakup and the resultant fragmented species were characterized by infrared and X-ray absorption spectroscopies, and the fragmented species were imaged by scanning transmission electron microscopy. The spectra identify the surface osmium complexes as Os(CO) ₂{O _support} _n (n = 3 or 4) (where the braces denote support surface atoms). The images show site-isolated Os atoms in mononuclear osmium species on MgO. The intensity analysis on the images of the MgO(110) face showed that the Os atoms were located atop Mg columns. This information led to a model of the Os(CO) ₂ on MgO(110), with the distances approximated as those determined by EXAFS spectroscopy, which are an average over the whole MgO surface; the results imply that these complexes were located at Mg vacancies.

Original language	English
Pages (from-to)	1865-1871
Number of pages	7
Journal	Journal of Physical Chemistry Letters
Volume	3
Issue number	14
DOIs	https://doi.org/10.1021/jz300574u
State	Published - Jul 19 2012

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title = "Atomically resolved site-isolated catalyst on MgO: Mononuclear osmium dicarbonyls formed from Os 3(CO) 12",

abstract = "Supported triosmium clusters, formed from Os 3(CO) 12 on MgO, were treated in helium at 548 K for 2 h, causing fragmentation of the cluster frame and the formation of mononuclear osmium dicarbonyls. The cluster breakup and the resultant fragmented species were characterized by infrared and X-ray absorption spectroscopies, and the fragmented species were imaged by scanning transmission electron microscopy. The spectra identify the surface osmium complexes as Os(CO) 2{O support} n (n = 3 or 4) (where the braces denote support surface atoms). The images show site-isolated Os atoms in mononuclear osmium species on MgO. The intensity analysis on the images of the MgO(110) face showed that the Os atoms were located atop Mg columns. This information led to a model of the Os(CO) 2 on MgO(110), with the distances approximated as those determined by EXAFS spectroscopy, which are an average over the whole MgO surface; the results imply that these complexes were located at Mg vacancies.",

author = "Ceren Aydin and Apoorva Kulkarni and Miaofang Chi and Browning, {Nigel D.} and Gates, {Bruce C.}",

year = "2012",

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T1 - Atomically resolved site-isolated catalyst on MgO

T2 - Mononuclear osmium dicarbonyls formed from Os 3(CO) 12

AU - Aydin, Ceren

AU - Kulkarni, Apoorva

AU - Chi, Miaofang

AU - Browning, Nigel D.

AU - Gates, Bruce C.

PY - 2012/7/19

Y1 - 2012/7/19

N2 - Supported triosmium clusters, formed from Os 3(CO) 12 on MgO, were treated in helium at 548 K for 2 h, causing fragmentation of the cluster frame and the formation of mononuclear osmium dicarbonyls. The cluster breakup and the resultant fragmented species were characterized by infrared and X-ray absorption spectroscopies, and the fragmented species were imaged by scanning transmission electron microscopy. The spectra identify the surface osmium complexes as Os(CO) 2{O support} n (n = 3 or 4) (where the braces denote support surface atoms). The images show site-isolated Os atoms in mononuclear osmium species on MgO. The intensity analysis on the images of the MgO(110) face showed that the Os atoms were located atop Mg columns. This information led to a model of the Os(CO) 2 on MgO(110), with the distances approximated as those determined by EXAFS spectroscopy, which are an average over the whole MgO surface; the results imply that these complexes were located at Mg vacancies.

AB - Supported triosmium clusters, formed from Os 3(CO) 12 on MgO, were treated in helium at 548 K for 2 h, causing fragmentation of the cluster frame and the formation of mononuclear osmium dicarbonyls. The cluster breakup and the resultant fragmented species were characterized by infrared and X-ray absorption spectroscopies, and the fragmented species were imaged by scanning transmission electron microscopy. The spectra identify the surface osmium complexes as Os(CO) 2{O support} n (n = 3 or 4) (where the braces denote support surface atoms). The images show site-isolated Os atoms in mononuclear osmium species on MgO. The intensity analysis on the images of the MgO(110) face showed that the Os atoms were located atop Mg columns. This information led to a model of the Os(CO) 2 on MgO(110), with the distances approximated as those determined by EXAFS spectroscopy, which are an average over the whole MgO surface; the results imply that these complexes were located at Mg vacancies.

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Atomically resolved site-isolated catalyst on MgO: Mononuclear osmium dicarbonyls formed from Os ₃(CO) ₁₂

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