Evidence for the Adsorption of Oriented nido-R2C2B4H6Carborane Cluster Molecules on Si(111) Surfaces

Sunwoo Lee; Dongqi Li; P. A. Dowben; F. K. Perkins; M. Onellion; James T. Spencer

doi:10.1021/ja00022a036

Evidence for the Adsorption of Oriented nido-R₂C₂B₄H₆Carborane Cluster Molecules on Si(111) Surfaces

Sunwoo Lee, Dongqi Li, P. A. Dowben, F. K. Perkins, M. Onellion, James T. Spencer

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

Angle-resolved photoemission has provided clear evidence that the initial adsorption of the small heteroborane cluster molecule nido2,3-diethyl-2,3-dicarbahexaborane(8), (C₂H₅)₂C₂B₄H₆, on Si(111) surfaces at 90 K occurs with partial dissociation of the cluster and results in the loss of ethyl groups (C₂H₅) from the molecule. The C₂B₄H₆ carborane fragment adsorbs molecularly on the Si(111) surface with the basal C₂B₃ plane of the cage parallel with the Si(111) surface normal. The complete assignment of the photoemission features and the molecular orientation of the cage is possible from a comparison of the experimental photoemission results with MNDO semiempirical theoretical calculations on nido-(C₂H₅)₂C₂B₄H₆ and nido-C₂B₄H₈.

Original language	English (US)
Pages (from-to)	8444-8447
Number of pages	4
Journal	Journal of the American Chemical Society
Volume	113
Issue number	22
DOIs	https://doi.org/10.1021/ja00022a036
State	Published - Oct 1 1991

ASJC Scopus subject areas

Catalysis
General Chemistry
Biochemistry
Colloid and Surface Chemistry

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title = "Evidence for the Adsorption of Oriented nido-R2C2B4H6Carborane Cluster Molecules on Si(111) Surfaces",

abstract = "Angle-resolved photoemission has provided clear evidence that the initial adsorption of the small heteroborane cluster molecule nido2,3-diethyl-2,3-dicarbahexaborane(8), (C2H5)2C2B4H6, on Si(111) surfaces at 90 K occurs with partial dissociation of the cluster and results in the loss of ethyl groups (C2H5) from the molecule. The C2B4H6 carborane fragment adsorbs molecularly on the Si(111) surface with the basal C2B3 plane of the cage parallel with the Si(111) surface normal. The complete assignment of the photoemission features and the molecular orientation of the cage is possible from a comparison of the experimental photoemission results with MNDO semiempirical theoretical calculations on nido-(C2H5)2C2B4H6 and nido-C2B4H8.",

author = "Sunwoo Lee and Dongqi Li and Dowben, {P. A.} and Perkins, {F. K.} and M. Onellion and Spencer, {James T.}",

year = "1991",

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T1 - Evidence for the Adsorption of Oriented nido-R2C2B4H6Carborane Cluster Molecules on Si(111) Surfaces

AU - Lee, Sunwoo

AU - Li, Dongqi

AU - Dowben, P. A.

AU - Perkins, F. K.

AU - Onellion, M.

AU - Spencer, James T.

PY - 1991/10/1

Y1 - 1991/10/1

N2 - Angle-resolved photoemission has provided clear evidence that the initial adsorption of the small heteroborane cluster molecule nido2,3-diethyl-2,3-dicarbahexaborane(8), (C2H5)2C2B4H6, on Si(111) surfaces at 90 K occurs with partial dissociation of the cluster and results in the loss of ethyl groups (C2H5) from the molecule. The C2B4H6 carborane fragment adsorbs molecularly on the Si(111) surface with the basal C2B3 plane of the cage parallel with the Si(111) surface normal. The complete assignment of the photoemission features and the molecular orientation of the cage is possible from a comparison of the experimental photoemission results with MNDO semiempirical theoretical calculations on nido-(C2H5)2C2B4H6 and nido-C2B4H8.

AB - Angle-resolved photoemission has provided clear evidence that the initial adsorption of the small heteroborane cluster molecule nido2,3-diethyl-2,3-dicarbahexaborane(8), (C2H5)2C2B4H6, on Si(111) surfaces at 90 K occurs with partial dissociation of the cluster and results in the loss of ethyl groups (C2H5) from the molecule. The C2B4H6 carborane fragment adsorbs molecularly on the Si(111) surface with the basal C2B3 plane of the cage parallel with the Si(111) surface normal. The complete assignment of the photoemission features and the molecular orientation of the cage is possible from a comparison of the experimental photoemission results with MNDO semiempirical theoretical calculations on nido-(C2H5)2C2B4H6 and nido-C2B4H8.

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Evidence for the Adsorption of Oriented nido-R₂C₂B₄H₆Carborane Cluster Molecules on Si(111) Surfaces

Abstract

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