The infrared spectra of surface metal atom vibrations

Infrared spectra have been obtained of 1-butene chemisorbed on silica-supported platinum and nickel over the temperature range —78 to +95 °C. Virtually identical spectra were observed for 1-butene chemisorbed on platinum at — 78, 20 and 95 °C. The dominant spectral features at 2958, 2930 and 2870 cm -1 are assigned to associatively chemisorbed 1-butene, CH 3 —CH 2 —CHM—CH 2 M; a weaker band near 3010 cm -1 is attributed to olefinic surface species of the type MCH=CRM (M = surface metal atom; R — alkyl group). On hydrogenation most of the chemisorbed surface species were converted to n-butane, but at 95 °C a weak spectrum of chemisorbed w-butyl groups was observed. From the large spectral intensity increase on hydrogenation (eightfold to tenfold) it is concluded that considerable dissociative chemisorption must have occurred initially, probably to yield some surface carbide with a C 4 skeleton. A very similar spectrum, likewise attributed to an associatively adsorbed species (bands at 2958, 2920, 2870 cm -1 ), was obtained after chemisorption of 1-butene on nickel at — 78 °C. On hydrogenation at — 78 °C a large amount of n-butane was formed and the metal surface was virtually cleared of chemisorbed species. The spectral intensity increase on hydrogenation at — 78 °C was about 7.5-fold, indicating that the degree of initial dissociative chemisorption is about as great as that which occurred on platinum at all temperatures. However, after chemisorption at 20 or 95 °C, the spectra on nickel indicated that a greater number of CM bonds are formed and that some of the chemisorbed C 4 species may be attached to the surface at three or four of the carbon atoms. Also the amount of adsorption increased slowly with time. On hydrogenation at 20 °C only a small amount of n -butane was produced and many surface n -butyl groups were obtained. Also less dissociative chemisorption occurs on nickel at this temperature, for the spectral intensity increase on hydrogenation was about fourfold.

Realization of N-Type Semiconducting of Phosphorene through Surface Metal Doping and Work Function Study

Journal of Nanomaterials ◽

10.1155/2018/6863890 ◽

2018 ◽

Vol 2018 ◽

pp. 1-9 ◽

Cited By ~ 8

Author(s):

Haocheng Sun ◽

Yuan Shang ◽

Yanmei Yang ◽

Meng Guo

Keyword(s):

Electronic Structure ◽

Work Function ◽

Valence Electron ◽

Electron Configuration ◽

Impurity States ◽

Cu Doping ◽

Na Doping ◽

Surface Metal ◽

Structure Engineering ◽

Surface Metal Atom

Phosphorene becomes an important member of the layered nanomaterials since its discovery for the fabrication of nanodevices. In the experiments, pristine phosphorene shows p-type semiconducting with no exception. To reach its full capability, n-type semiconducting is a necessity. Here, we report the electronic structure engineering of phosphorene by surface metal atom doping. Five metal elements, Cu, Ag, Au, Li, and Na, have been considered which could form stable adsorption on phosphorene. These elements show patterns in their electron configuration with one valence electron in their outermost s-orbital. Among three group 11 elements, Cu can induce n-type degenerate semiconducting, while Ag and Au can only introduce localized impurity states. The distinct ability of Cu, compared to Ag and Au, is mainly attributed to the electronegativity. Cu has smaller electronegativity and thus denotes its electron to phosphorene, upshifting the Fermi level towards conduction band, resulting in n-type semiconducting. Ag and Au have larger electronegativity and hardly transfer electrons to phosphorene. Parallel studies of Li and Na doping support these findings. In addition, Cu doping effectively regulates the work function of phosphorene, which gradually decreases upon increasing Cu concentration. It is also interesting that Au can hardly change the work function of phosphorene.

"Sideways" Bonded Dinitrogen in Matrix Isolated Cobalt Dinitrogen, CoN2

Canadian Journal of Chemistry ◽

10.1139/v73-097 ◽

1973 ◽

Vol 51 (4) ◽

pp. 637-640 ◽

Cited By ~ 42

Author(s):

G. A. Ozin ◽

A. Vander Voet

Keyword(s):

Transition Metal ◽

Metal Atom ◽

Infrared Spectra ◽

Transition Metal Atom ◽

Spectroscopic Evidence ◽

Isotopic Species ◽

Argon Matrices

Infrared spectra are reported for matrix isolated cobalt dinitrogen isotopic species, Co14N2, Co14N15N and Co15N2, formed in the cocondensation reaction of atomic cobalt with dilute nitrogen–argon matrices at 10°K. The data provide the first unambiguous spectroscopic evidence for a dinitrogen molecule bonded in a "sideways" fashion to a transition metal atom.

Infrared spectra of alkali metal atom-ammonia complexes in solid argon

Journal of the American Chemical Society ◽

10.1021/ja00236a002 ◽

1987 ◽

Vol 109 (2) ◽

pp. 300-304 ◽

Cited By ~ 25

Author(s):

Sefik Suezer ◽

Lester Andrews

Keyword(s):

Alkali Metal ◽

Metal Atom ◽

Infrared Spectra ◽

Alkali Metal Atom ◽

Solid Argon

Cyanides, Isocyanides, and Hydrides of Zn, Cd and Hg from Metal Atom and HCN Reactions: Matrix Infrared Spectra and Electronic Structure Calculations

ChemPhysChem ◽

10.1002/cphc.202100011 ◽

2021 ◽

Author(s):

Hongmin Li ◽

Yetsedaw A. Tsegaw ◽

Lester Andrews ◽

Carl Trindle ◽

Han‐Gook Cho ◽

...

Keyword(s):

Electronic Structure ◽

Metal Atom ◽

Infrared Spectra ◽

Electronic Structure Calculations ◽

Structure Calculations

Far-infrared spectra of metal atom cluster compounds. I. Mo6X34+ derivatives

Inorganic Chemistry ◽

10.1021/ic50047a004 ◽

1967 ◽

Vol 6 (1) ◽

pp. 11-15 ◽

Cited By ~ 53

Author(s):

F. Albert Cotton ◽

Richard M. Wing ◽

R. A. Zimmerman

Keyword(s):

Metal Atom ◽

Infrared Spectra ◽

Far Infrared ◽

Cluster Compounds ◽

Atom Cluster ◽

Far Infrared Spectra

Near infrared spectra of some cobalt(II) compounds

Australian Journal of Chemistry ◽

10.1071/ch9681775 ◽

1968 ◽

Vol 21 (7) ◽

pp. 1775

Author(s):

DP Graddon ◽

GM Mockler

Keyword(s):

Absorption Band ◽

Absorption Spectra ◽

Metal Atom ◽

Infrared Spectra ◽

Near Infrared ◽

Infrared Region ◽

Absorption Bands ◽

Heterocyclic Base ◽

Near Infrared Spectra ◽

Near Infrared Region

Absorption spectra of compounds CoX2B2 and CoX2B4 (X = Cl, Br, I, or NCS; B = a heterocyclic base) have been obtained by reflectance and in solution in the near infrared region between 1000 and 2000 mμ. The spectra are characteristic of the stereochemistry of the metal atom: octahedral compounds have a single absorption band near 1100 mμ, e < 10; tetrahedral compounds have three overlapping absorption bands near 1100,1400, and 1700 mp, 30 < < 150. Comparisons are made with previously observed spectra of octahedral and tetrahedral species of the types CoL2+6 and CoX2-4.

Group 4 Transition-Metal Atom Reactions with CS2and OCS: Infrared Spectra and Density Functional Calculations of SMCS, SM-(η2-CS), SMCO, and OMCS in Solid Argon

The Journal of Physical Chemistry A ◽

10.1021/jp064433l ◽

2006 ◽

Vol 110 (47) ◽

pp. 12785-12792 ◽

Cited By ~ 1

Author(s):

Alexander B. Baker ◽

Lester Andrews

Keyword(s):

Transition Metal ◽

Metal Atom ◽

Infrared Spectra ◽

Density Functional Calculations ◽

Density Functional ◽

Transition Metal Atom ◽

Group 4 ◽

Solid Argon ◽

Metal Atom Reactions