The thermal decomposition of azomethane on Pt(111)

David Jentz; Michael Trenary; X. D. Peng; Peter Stair

doi:10.1016/0039-6028(95)00727-X

The thermal decomposition of azomethane on Pt(111)

David Jentz, Michael Trenary^*, X. D. Peng, Peter Stair

^*Corresponding author for this work

Chemistry

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

63 Scopus citations

Abstract

The thermal decomposition of azomethane, CH₃N=NCH₃, and methylamine, CH₃NH₂,on Pt(111) has been investigated by reflection absorption infrared spectroscopy (RAIRS) and temperature programmed reaction spectroscopy (TPRS). Using the surface dipole selection rule of RAIRS and comparing with the IR and Raman spectra of solidtrans-andcis-azomethane, we find thattrans-azomethane converts tocis-azomethane upon adsorbing onto the Pt(111) surface at 84 K. Additionally, we propose that thecis-azomethane tautomerizes to formaldehyde methylhydrazone, CH₃NHN=CH₂, which subsequently undergoes N-N bond cleavage between 200 and 275 K. Above 300 K aminomethylidyne, CNH₂, is formed. Aminomethylidyne is also formed on the methylamine dosed surface. Cyanogen, C₂N₂(g), formed from the combination of CN_ads was also observed by TPRS as a minor reaction product. A comparison of the IR spectra of azomethane and methylamine dosed surfaces indicates the formation of chemisorbed methylamine as one intermediate in the decomposition of azomethane.

Original language	English (US)
Pages (from-to)	282-294
Number of pages	13
Journal	Surface Science
Volume	341
Issue number	3
DOIs	https://doi.org/10.1016/0039-6028(95)00727-X
State	Published - Nov 10 1995

Keywords

Azomethane
Chemisorption
Hydrogen cyanide
Low index single crystal surfaces
Metallic surfaces
Methylamine
Platinum
Reflection spectroscopy
Solid-gas interfaces
Thermal desorption
Vibrations of adsorbed molecules

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/0039-6028(95)00727-X

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title = "The thermal decomposition of azomethane on Pt(111)",

abstract = "The thermal decomposition of azomethane, CH3N=NCH3, and methylamine, CH3NH2,on Pt(111) has been investigated by reflection absorption infrared spectroscopy (RAIRS) and temperature programmed reaction spectroscopy (TPRS). Using the surface dipole selection rule of RAIRS and comparing with the IR and Raman spectra of solidtrans-andcis-azomethane, we find thattrans-azomethane converts tocis-azomethane upon adsorbing onto the Pt(111) surface at 84 K. Additionally, we propose that thecis-azomethane tautomerizes to formaldehyde methylhydrazone, CH3NHN=CH2, which subsequently undergoes N-N bond cleavage between 200 and 275 K. Above 300 K aminomethylidyne, CNH2, is formed. Aminomethylidyne is also formed on the methylamine dosed surface. Cyanogen, C2N2(g), formed from the combination of CNads was also observed by TPRS as a minor reaction product. A comparison of the IR spectra of azomethane and methylamine dosed surfaces indicates the formation of chemisorbed methylamine as one intermediate in the decomposition of azomethane.",

keywords = "Azomethane, Chemisorption, Hydrogen cyanide, Low index single crystal surfaces, Metallic surfaces, Methylamine, Platinum, Reflection spectroscopy, Solid-gas interfaces, Thermal desorption, Vibrations of adsorbed molecules",

author = "David Jentz and Michael Trenary and Peng, {X. D.} and Peter Stair",

note = "Funding Information: knowledge the National Science Foundation, Grants CHE-9221687 (D.J., M.T.) and CHE-9305937 (X.D.P., P.S.), for financial support.",

year = "1995",

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doi = "10.1016/0039-6028(95)00727-X",

language = "English (US)",

volume = "341",

pages = "282--294",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier",

number = "3",

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T1 - The thermal decomposition of azomethane on Pt(111)

AU - Jentz, David

AU - Trenary, Michael

AU - Peng, X. D.

AU - Stair, Peter

N1 - Funding Information: knowledge the National Science Foundation, Grants CHE-9221687 (D.J., M.T.) and CHE-9305937 (X.D.P., P.S.), for financial support.

PY - 1995/11/10

Y1 - 1995/11/10

N2 - The thermal decomposition of azomethane, CH3N=NCH3, and methylamine, CH3NH2,on Pt(111) has been investigated by reflection absorption infrared spectroscopy (RAIRS) and temperature programmed reaction spectroscopy (TPRS). Using the surface dipole selection rule of RAIRS and comparing with the IR and Raman spectra of solidtrans-andcis-azomethane, we find thattrans-azomethane converts tocis-azomethane upon adsorbing onto the Pt(111) surface at 84 K. Additionally, we propose that thecis-azomethane tautomerizes to formaldehyde methylhydrazone, CH3NHN=CH2, which subsequently undergoes N-N bond cleavage between 200 and 275 K. Above 300 K aminomethylidyne, CNH2, is formed. Aminomethylidyne is also formed on the methylamine dosed surface. Cyanogen, C2N2(g), formed from the combination of CNads was also observed by TPRS as a minor reaction product. A comparison of the IR spectra of azomethane and methylamine dosed surfaces indicates the formation of chemisorbed methylamine as one intermediate in the decomposition of azomethane.

AB - The thermal decomposition of azomethane, CH3N=NCH3, and methylamine, CH3NH2,on Pt(111) has been investigated by reflection absorption infrared spectroscopy (RAIRS) and temperature programmed reaction spectroscopy (TPRS). Using the surface dipole selection rule of RAIRS and comparing with the IR and Raman spectra of solidtrans-andcis-azomethane, we find thattrans-azomethane converts tocis-azomethane upon adsorbing onto the Pt(111) surface at 84 K. Additionally, we propose that thecis-azomethane tautomerizes to formaldehyde methylhydrazone, CH3NHN=CH2, which subsequently undergoes N-N bond cleavage between 200 and 275 K. Above 300 K aminomethylidyne, CNH2, is formed. Aminomethylidyne is also formed on the methylamine dosed surface. Cyanogen, C2N2(g), formed from the combination of CNads was also observed by TPRS as a minor reaction product. A comparison of the IR spectra of azomethane and methylamine dosed surfaces indicates the formation of chemisorbed methylamine as one intermediate in the decomposition of azomethane.

KW - Azomethane

KW - Chemisorption

KW - Hydrogen cyanide

KW - Low index single crystal surfaces

KW - Metallic surfaces

KW - Methylamine

KW - Platinum

KW - Reflection spectroscopy

KW - Solid-gas interfaces

KW - Thermal desorption

KW - Vibrations of adsorbed molecules

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U2 - 10.1016/0039-6028(95)00727-X

DO - 10.1016/0039-6028(95)00727-X

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AN - SCOPUS:0029406551

SN - 0039-6028

VL - 341

SP - 282

EP - 294

JO - Surface Science

JF - Surface Science

IS - 3

ER -

The thermal decomposition of azomethane on Pt(111)

Abstract

Keywords

ASJC Scopus subject areas

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