Adsorption and Reaction of Trifluoromethyl Iodide on Ni(111)

Myli, K. B.; Grassian, Vicki H.

doi:10.1021/j100015a048

Cited by 14 publications

(6 citation statements)

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“…The band at 1188 cm -1 cannot be assigned to a −CF 3 adsorbed species produced by C−C bond cleavage. Indeed, on single crystals surfaces such as Ag(111), Pt(111), Ni(100), and Ni(111), the spectrum of an adsorbed CF 3 consisted of a single absorption band in the range 1050−1080 cm -1 , corresponding to the symmetric vibration of CF 3 fragment. Those frequencies were close to that of a symmetric mode of a gas-phase CF 3 radical, which was equal to 1087 cm -1 …”

Section: Discussionmentioning

confidence: 99%

Fourier Transform Infrared Study of 1,1-Dichlorotetrafluoroethane Adsorption on an Alumina-Supported Pd Catalyst

et al. 2000

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An FTIR investigation of CF3CFCl2 adsorption on 5% Pd/γ-Al2O3 at room temperature shows that three types of surface species form. Two of the species are identified as trifluoroethylidyne (CF3C⋮) and the third species is assigned to tetrafluoroethylidene (CF3CF). All three species are on the metal sites, not on the γ-Al2O3. The surface of the reduced fresh catalyst favors the formation of trifluoroethylidyne species. However, CF3CFCl2 adsorption on a catalyst preexposed to the CFC + H2 mixture at 473 K for 1 h, followed by reduction with H2 at 573 K for 1 h, results in the predominant formation of CF3CF. Both surface CF3CF and CF3C⋮ species readily interact with H2 at room temperature to form CF3CFH2 and CF3CH3.

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Section: Discussionmentioning

confidence: 99%

Fourier Transform Infrared Study of 1,1-Dichlorotetrafluoroethane Adsorption on an Alumina-Supported Pd Catalyst

et al. 2000

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“…11 In contrast to the reactions on Mo(110) we will describe here, reactions of CF 3 I on other metal surfaces yield gaseous reaction products containing at least one C-F bond, the strongest single bond that carbon forms. Desorption of CF 4 has been reported in the reactions of CF 3 I on Ni(111) 12 and Ru(001). 13,14 CF 3 radical desorption has been observed during the reaction of CF 3 I on Ag(111), [15][16][17] Ni(100), 18,19 Ni(111), 12 Pt(111), 20 and Ru-(001).…”

Section: Introductionmentioning

confidence: 99%

“…Desorption of CF 4 has been reported in the reactions of CF 3 I on Ni(111) 12 and Ru(001). 13,14 CF 3 radical desorption has been observed during the reaction of CF 3 I on Ag(111), [15][16][17] Ni(100), 18,19 Ni(111), 12 Pt(111), 20 and Ru-(001). 13 CF 2 fragments desorb during temperature-programmed desorption of CF 3 I on Pt(111), 20 Ni(111), 12 and Ru(001).…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to the reactions on Mo(110) we will describe here, reactions of CF 3 I on other metal surfaces yield gaseous reaction products containing at least one C−F bond, the strongest single bond that carbon forms. Desorption of CF 4 has been reported in the reactions of CF 3 I on Ni(111) and Ru(001). , CF 3 radical desorption has been observed during the reaction of CF 3 I on Ag(111), − Ni(100), , Ni(111), Pt(111), and Ru(001) . CF 2 fragments desorb during temperature-programmed desorption of CF 3 I on Pt(111), Ni(111), and Ru(001). , Following adsorption of CF 3 I on Cu(111), cleavage of a single C−F bond in adsorbed CF 3 results in the selective formation of adsorbed CF 2 moieties whose subsequent coupling yields gaseous C 2 F 4 …”

Section: Introductionmentioning

confidence: 99%

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Surface Chemistry and Radiation Chemistry of Trifluoroiodomethane (CF₃I) on Mo(110)

et al. 2004

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The surface-induced and electron-induced chemistry of trifluoroiodomethane (CF3I), a potential replacement for chlorofluorocarbons (CFCs) and chlorofluorobromocarbons (halons), were investigated under ultrahigh vacuum conditions (p ∼ 1 × 10-10 Torr) on Mo(110). Results of temperature-programmed desorption (TPD) experiments indicate that dissociative adsorption of CF3I leads only to nonselective decomposition on Mo(110), in contrast to reactions of CF3I on other metal surfaces. Desorption of CF3 radicals and atomic iodine was detected mass spectrometrically during low-energy (10−100 eV) electron irradiation of four monolayer thick films of CF3I condensed at 100 K. Results of postirradiation temperature-programmed desorption experiments were used to identify CF2I2, C2F5I, C2F6, C2F4I2, and CFI3 as electron-induced reaction products of CF3I. Except for CFI3, all of these electron-induced reaction products of CF3I have been previously identified in γ-radiolysis studies, supporting our earlier claim that temperature-programmed desorption experiments conducted following low-energy electron irradiation of multilayer thin films provide an effective method to investigate the effects of high-energy radiation, including radical−radical reactions.

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“…Before the ex situ spectra were recorded, the octanethiol monolayer on cobalt was removed from the ionic liquid solution and rinsed thoroughly with ethanol and water. Nevertheless, as well as the expected C–H stretching and bending modes of the octanethiol alkane chain, an additional peak is seen at 1189 cm –1 , which can be attributed to an asymmetric C–F stretch ( v as (C–F)) of the ionic liquid anion, OTf – , which is not completely removed in the rinsing process, either on top of the monolayer or intercalated at defects in the monolayer. This would imply that cations also remain on the monolayer even following rinsing to ensure neutrality.…”

Section: Resultsmentioning

confidence: 95%

Ionic Liquid Based Approach for Single-Molecule Electronics with Cobalt Contacts

et al. 2014

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An electrochemical method is presented for fabricating cobalt thin films for single-molecule electrical transport measurements. These films are electroplated in an aqueous electrolyte, but the crucial stages of electrochemical reduction to remove surface oxide and adsorption of alkane(di)thiol target molecules under electrochemical control to form self-assembled monolayers which protect the oxide-free cobalt surface are carried out in an ionic liquid. This approach yields monolayers on Co that are of comparable quality to those formed on Au by standard self-assembly protocols, as assessed by electrochemical methods and surface infrared spectroscopy. Using an adapted scanning tunneling microscopy (STM) method, we have determined the single-molecule conductance of cobalt/1,8-octanedithiol/cobalt junctions by employing a monolayer on cobalt and a cobalt STM tip in an ionic liquid environment and have compared the results with those of experiments using gold electrodes as a control. These cobalt substrates could therefore have future application in organic spintronic devices such as magnetic tunnel junctions.

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Adsorption and Reaction of Trifluoromethyl Iodide on Ni(111)

Cited by 14 publications

References 2 publications

Fourier Transform Infrared Study of 1,1-Dichlorotetrafluoroethane Adsorption on an Alumina-Supported Pd Catalyst

Fourier Transform Infrared Study of 1,1-Dichlorotetrafluoroethane Adsorption on an Alumina-Supported Pd Catalyst

Surface Chemistry and Radiation Chemistry of Trifluoroiodomethane (CF₃I) on Mo(110)

Ionic Liquid Based Approach for Single-Molecule Electronics with Cobalt Contacts

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Adsorption and Reaction of Trifluoromethyl Iodide on Ni(111)

Cited by 14 publications

References 2 publications

Fourier Transform Infrared Study of 1,1-Dichlorotetrafluoroethane Adsorption on an Alumina-Supported Pd Catalyst

Fourier Transform Infrared Study of 1,1-Dichlorotetrafluoroethane Adsorption on an Alumina-Supported Pd Catalyst

Surface Chemistry and Radiation Chemistry of Trifluoroiodomethane (CF3I) on Mo(110)

Ionic Liquid Based Approach for Single-Molecule Electronics with Cobalt Contacts

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Product

Resources

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Surface Chemistry and Radiation Chemistry of Trifluoroiodomethane (CF₃I) on Mo(110)