The structure of NH<sub>3</sub> on Ni(111)

Madey, T. E.; Houston, Jack E.; Seabury, C.W.; Rhodin, T. N.

doi:10.1116/1.570769

Cited by 71 publications

(15 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1(b) is an H + ESDIAD pattern for NH 3 adsorbed on Ni(lll). As reported previously, 6 the "halo" pattern of Fig. 1(b) is characteristic of NH 3 adsorption at T<r 140 K for fractional monolayer coverages and is consistent with an array of NH 3 molecules bonded via the N atoms, with no preferred azimuthal orientation of the H ligands which point away from the surface.…”

supporting

confidence: 85%

“…For NH 3 (Ref. 6) and H 2 0 on Ni(lll) there is little or no azimuthal ordering seen in ESDIAD studies for fractional monolayers on the clean surface. For the adsorption of either molecule, however, traces of oxygen preadsorbed on Ni(lll) result in sharp threefold ion-desorption patterns indicative of azimuthal ordering in the adsorbed layer due to hydrogen bonding.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Coadsorption-Induced Azimuthal Ordering in Molecular Adsorbate Layers:H2O and NH3
Netzer
¹
,
Madey
²

1981
Phys. Rev. Lett.
100
3
9
0
View full text Add to dashboard Cite

Traces of preadsorbed oxygen on a metal surface will induce a high degree of azimuthal order in adsorbed molecules which are disordered azimuthally on the clean surface. This azimuthal-ordering effect has been studied for both NH 3 and H 2 0 on Ni(lll).PACS numbers: 68.20.+t, 68.55.+b, 79.20.Kz The surface chemistry of a number of molecules which are weakly chemisorbed on clean metal surfaces has been shown recently to be influenced profoundly by coadsorption of the molecules with oxygen. The adsorption energies of several hydrogen-containing molecules such as methanol, 1 ethanol, 1 H 2 0, 2 " 5 and NH 3 4 are apparently increased as a result of hydrogen bonding to preadsorbed oxygen atoms on surfaces of Cu, Ag, Pt, and Ir. In most instances, evidence for hydrogen abstraction to form adsorbed OH along with an adsorbed radical fragment 1 " 5 has been seen [e.g., CH 3 OH(ads) + 0(ads)-~ CH 3 0(ads) + OH (ads)].In this paper, we present the first direct evidence that traces of preadsorbed oxygen on a metal surface will induce a high degree of azimuthal order in adsorbed molecules which are disordered azimuthally on the clean surface. We have used electron-simulated-desorption ion angular distributions (ESDIAD), low-energy electron diffraction (LEED), and temperature-programmed desorption (TPD) to study the adsorption of H 2 0 and NH 3 on a Ni(lll) surface, both clean and with preadsorbed oxygen. The ESDIAD method 6 " 8 is well suited for studies of the local geometrical structure of adsorbed molecules, primarily because the directions of ion desorption are directly related to the orientations of the surface bonds broken by electron excitation. Ultraviolet photoemission spectroscopy (UPS) has been used previously to show that NH 3 bonds to clean Ni(lll) via the N atom, 9 with the H atoms oriented away from the surface; molecular H 2 0 bonded to Ni films, 10 Pt(lll), 3 and Ru(OOl) (Ref. 7) is similarly adsorbed via the O atoms, with the H atoms oriented away from the surface. For NH 3 (Ref. 6) and H 2 0 on Ni(lll) there is little or no azimuthal ordering seen in ESDIAD studies for fractional monolayers on the clean surface. For the adsorption of either molecule, however, traces of oxygen preadsorbed on Ni(lll) result in sharp threefold ion-desorption patterns indicative of azimuthal ordering in the adsorbed layer due to hydrogen bonding. The implications of this oxygen-induced surface ordering for the mechanisms of catalytic promoters and poisons are evident.The ultrahigh-vacuum apparatus and methods used for the studies have been described previously in detail. 8 ESDIAD and LEED patterns were viewed directly on a fluorescent screen following image intensification of the desorbingion (or scattered-electron) signal using a double microchannel plate detector in a hemispherical retarding grid analyzer. NH 3 and H 2 0 were deposited onto the front surface of the Ni(lll) sample with use of a calibrated molecular beam doser having a microcapillary array as an effusion source. Mass analyses of ESD ions and of thermal deso...

show abstract

supporting

confidence: 85%

mentioning

confidence: 99%

Coadsorption-Induced Azimuthal Ordering in Molecular Adsorbate Layers:H2O and NH3
Netzer
¹
,
Madey
²

1981
Phys. Rev. Lett.
100
3
9
0
View full text Add to dashboard Cite

show abstract

“…Maxted [1] discovered that these molecules were bonded strongly to the catalysts and formed the chemisorptive bond via the unshared electron pairs, which implied that poisons at low concentrations could obviously deactivate the catalysts. The adsorption of nitrogen compounds on the metal surface has been the subject of considerable investigation [3][4][5][6]. The results showed that the chemisorption of NH 3 on the most metal surface (such as Ni, Fe) was at the on-top site by the interaction of the lone-pair electron orbit of N with 4s, 4p z and 3d z 2 orbits of Ni.…”

Section: Introductionmentioning

confidence: 96%

Poisoning effect of some nitrogen compounds on nano-sized nickel catalysts in p-nitrophenol hydrogenation

Chen

et al. 2006

Chemical Engineering Journal

View full text Add to dashboard Cite

“…This lone pair at the nitrogen is available for donation to other species (accept a proton) during bonding [90,91]. Madey and Houston [92] found that when NH 3 is adsorbed on metal Ni(111), it is molecularly adsorbed, and is bonded to the surface via the N atom (becomes part of the structure) with the H atoms oriented away from the surface. Netzer and Madley [93] further confirmed that traces of pre-adsorbed oxygen on a metal surface will induce a high degree of azimuthal order in adsorbed molecules.…”

Section: Resultsmentioning

confidence: 99%

Crystallography of Representative MOFs Based on Pillared Cyanonickelate (PICNIC) Architecture

2016

View full text Add to dashboard Cite

Abstract:The pillared layer motif is a commonly used route to porous coordination polymers or metal organic frameworks (MOFs). Materials based on the pillared cyano-bridged architecture, [Ni'(L)Ni(CN) 4 ] n (L = pillar organic ligands), also known as PICNICs, have been shown to be especially diverse where pore size and pore functionality can be varied by the choice of pillar organic ligand. In addition, a number of PICNICs form soft porous structures that show reversible structure transitions during the adsorption and desorption of guests. The structural flexibility in these materials can be affected by relatively minor differences in ligand design, and the physical driving force for variations in host-guest behavior in these materials is still not known. One key to understanding this diversity is a detailed investigation of the crystal structures of both rigid and flexible PICNIC derivatives. This article gives a brief review of flexible MOFs. It also reports the crystal structures of five PICNICS from our laboratories including three 3-D porous frameworks (Ni-Bpene, NI-BpyMe, Ni-BpyNH2), one 2-D layer (Ni-Bpy), and one 1-D chain (Ni-Naph) compound. The sorption data of BpyMe for CO 2 , CH 4 and N 2 is described. The important role of NH 3 (from the solvent of crystallization) as blocking ligands which prevent the polymerization of the 1-D chains and 2-D layers to become 3D porous frameworks in the Ni-Bpy and Ni-Naph compounds is also addressed.

show abstract

The structure of NH₃ on Ni(111)

Abstract: Articles you may be interested inThe structure and chemistry of CH3 and CH radicals adsorbed on Ni (111)

Cited by 71 publications

References 0 publications

Coadsorption-Induced Azimuthal Ordering in Molecular Adsorbate Layers:H2O and NH3
Netzer
¹
,
Madey
²

1981
Phys. Rev. Lett.
100
3
9
0
View full text Add to dashboard Cite

Coadsorption-Induced Azimuthal Ordering in Molecular Adsorbate Layers:H2O and NH3
Netzer
¹
,
Madey
²

1981
Phys. Rev. Lett.
100
3
9
0
View full text Add to dashboard Cite

Poisoning effect of some nitrogen compounds on nano-sized nickel catalysts in p-nitrophenol hydrogenation

Crystallography of Representative MOFs Based on Pillared Cyanonickelate (PICNIC) Architecture

Contact Info

Product

Resources

About

The structure of NH3 on Ni(111)

Abstract: Articles you may be interested inThe structure and chemistry of CH3 and CH radicals adsorbed on Ni (111)

Cited by 71 publications

References 0 publications

Coadsorption-Induced Azimuthal Ordering in Molecular Adsorbate Layers:H2O and NH3Netzer1, Madey2 1981Phys. Rev. Lett.100390View full textAdd to dashboardCite

Coadsorption-Induced Azimuthal Ordering in Molecular Adsorbate Layers:H2O and NH3Netzer1, Madey2 1981Phys. Rev. Lett.100390View full textAdd to dashboardCite

Poisoning effect of some nitrogen compounds on nano-sized nickel catalysts in p-nitrophenol hydrogenation

Crystallography of Representative MOFs Based on Pillared Cyanonickelate (PICNIC) Architecture

Contact Info

Product

Resources

About

The structure of NH₃ on Ni(111)

Coadsorption-Induced Azimuthal Ordering in Molecular Adsorbate Layers:H2O and NH3
Netzer
¹
,
Madey
²

1981
Phys. Rev. Lett.
100
3
9
0
View full text Add to dashboard Cite

Coadsorption-Induced Azimuthal Ordering in Molecular Adsorbate Layers:H2O and NH3
Netzer
¹
,
Madey
²

1981
Phys. Rev. Lett.
100
3
9
0
View full text Add to dashboard Cite