25215-76-3Relevant articles and documents
Structure and stability of CN adlayers on Rh(110)
Bondino, Federica,Baraldi, Alessandro,Comelli, Giovanni,Netzer, Falko P.
, p. 31 - 44 (2000)
The formation and stability of CN adlayers on Rh(110), formed by dissociative adsorption of C2N2 at 373 K, have been studied as a function of coverage and temperature by low-energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS), and thermal desorption spectroscopy (TDS). Two different CN adsorption states have been distinguished by their different C 1s and N 1s XPS core-level binding energies. The CN-I state is exclusively occupied up to a surface coverage of 0.5 monolayers (ML), where a well-ordered c(2 x 2) LEED pattern is observed. The CN-II state becomes additionally populated at higher coverages from 0.5 ML to the saturation coverage of 0.87 ML. At CN saturation, a c(4 x 2) LEED structure is formed. Desorption of CN as molecular C2N2 occurs only for surface coverages >0.5 ML and appears to be mainly derived from the CN-II state. The onset of C-N bond rupture is indicated at ～450-550 K, depending on the CN coverage; the resulting Nad desorbs at ～580 K from the more crowded surface and in the range of ～650-950 K, whereas Cad remains at the Rh surface and cannot be desorbed thermally.
Perry, J. H.,Bardwell, D. C.
, p. 2629 - 2632 (1925)
Ramsey, M. G.,Rosina, G.,Netzer, F. P.,Saalfeld, H. B.,Lloyd, D. R.
, p. 140 - 154 (1989)
Study by static SIMS, XPS and UPS of the adsorption of cyanogen on (100) Ni surfaces
Gouttebaron,Bourgeois,Perdereau
, p. 239 - 246 (2000)
The interaction of cyanogen with (100) Ni surfaces at room temperature was studied using secondary ion mass spectrometry in a static mode, and photoemission spectroscopies (XPS and UPS). It has been shown that cyanogen is adsorbed on this nickel surface in a dissociative mode: atomic carbon and nitrogen are present on the surface as well as CN fragments. These adsorbed species have been characterized by XPS and UPS. Increasing the temperature in the 400 K range increases the rate of the dissociation reaction of CN into atomic carbon and nitrogen. Moreover carbon is found to dissolved into the bulk for temperatures as low as 475 K. No evidence has been found of a polymerized form of cyanogen molecules on this nickel surface, when the temperature is increased unlike the results obtained for the (111) Ni surface.
Brokaw, R. S.,Pease, R. N.
, p. 1454 - 1457 (1953)
Cullis,Yates
, p. 141 (1964)
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Nakamura, S.
, p. 159 - 164 (1968)
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Penning Ionization of NCCN by Experiment and Theory: A Two-Dimensional Penning lonization Electron Spectroscopic and Quantum Chemical Study
Pasinszki, Tibor,Kishimoto, Naoki,Ogawa, Tetsuji,Ohno, Koichi
, p. 7170 - 7178 (1999)
Dicyanogen, NCCN, is generated for spectroscopic investigations on-line from rubeanic acid, mercury(II) cyanide, and cyanogen iodide and studied in the gas phase by two-dimensional Penning and He I photoelectron spectroscopies, as well as ab initio calculations. From spectroscopic data, the interaction between NCCN and He*(23S) atoms is deduced. The interaction potential for the similarly interacting NCCN-Li(22S) system is obtained from ab initio calculations at the CCSD/6-311++G** level. Experimental and calculated results show that the interaction potential is anisotropic around NCCN, is the most attractive in the nitrogen lone electron pair region, and gradually changes into repulsive as the N-C-He*(or Li) angle opens up to 90°. An unusual collision energy dependences of the partial ionization cross sections are observed, which is interpreted by the unusual interaction potential. For assisting experimental data and studying collision dynamics, classical trajectory calculations are performed for the Penning ionization of the NCCN-He*(23S) system. The spectroscopic investigations predict the existence of thermodynamically stable MLi radicals, and the structure and stability of NCCNLi isomers are calculated at the QCISD/6-311++G** level.
Grecu, John C.,Winnewisser, Brenda P.,Winnewisser, Manfred
, p. 534 - 550 (1993)
Adsorption geometry of CN on Cu(1 1 1) and Cu(1 1 1)/O
Polcik,Kittel,Hoeft,Terborg,Toomes,Woodruff
, p. 159 - 168 (2004)
The adsorption geometry of CN on Cu(111), both with and without predosing with oxygen, has been investigated using N K-edge near-edge X-ray absorption fine structure (NEXAFS) and C 1s and N 1s scanned-energy mode photoelectron diffraction (PhD). The NEXAFS shows clearly that adsorbed onto clean Cu(111) the C-N axis is closely parallel to the surface, but in the presence of coadsorbed oxygen the average orientation has the axis tilted by 25° away from the surface; this confirms a much earlier report of an oxygen-induced reorientation of CN on this surface based on vibrational spectroscopy. The PhD data show very weak modulations which are rather insensitive to the emission geometry, clearly implying a high degree of disorder or a local adsorption site well-removed from any position of high point group symmetry. The best-fit structure corresponds to the CN lying slightly displaced from the three-fold coordinated hollow sites but with the C and N atoms having single Cu atom nearest neighbours at distances of 1.98±0.05 and 2.00±0.05 A? respectively.
Donor-acceptor complexes of tellurium polycatlonlc clusters with cyanogen
Beck, Johannes,Zink, Marcus
, p. 692 - 699 (2009)
The reactions of cyanogen with Te6[AsF6]4 and Te4[AsF6]2 in SO2 solutions yield Te6[AsF6]4.1.5C2N2 (1) and Te4[A
Efficient aerobic oxidation of alcohols to esters by acidified carbon nitride photocatalysts
Antonietti, Markus,Cheng, Jiajia,Lin, Sen,Savateev, Aleksandr,Wan, Qiang,Wang, Chong,Wang, Xinchen
, p. 116 - 125 (2020/12/21)
Photocatalytic aerobic oxidation of alcohols for the direct synthesis of esters has received significant attention in recent years, but the relatively low efficiency and selectivity under visible light irradiation is the main challenge for their practical applications. Here, surface acidic sites were imparted onto metal-free heterogeneous photocatalysts by the protonation of carbon nitride (HMCN) to promote the activity for the esterification reaction through further adsorption and activation of the intermediate aldehyde. The activation of the substrate could be remarkably modulated through tuning the acidic sites on the surface of the photocatalyst, leading to a controllable reactivity of the catalytic reaction. The one-pot process for the direct aerobic oxidative esterification of alcohol exhibits high efficiency and selectivity under mild and additive-free conditions and the apparent quantum yield (AQY) of the photocatalytic esterification reaction is 0.41% at 420 nm. Moreover, a scalable photocatalytic process by the merging of a continuous flow system with the heterogeneous HMCN photocatalyst is demonstrated, combining high catalytic efficiency and stability at ambient temperatures and being promising for larger-scale applications.
Novel synthetic route to perfluoroallyl cyanide (PFACN) reacting perfluoroallyl fluorosulfonate with cyanide
Tverdomed, Sergey N.,Hirschberg, Markus E.,Pajkert, Romana,Hintzer, Klaus,R?schenthaler, Gerd-Volker
, p. 65 - 69 (2018/03/21)
A novel synthetic method for the preparation of perfluoroallyl cyanide CF2[dbnd]CFCF2CN (PFACN) is presented. This includes the addition – elimination reaction of cyanide anion with perfluoroallyl fluorosulfate CF2[dbnd]CF
Reactions of laser-ablated U atoms with (CN)2: Infrared spectra and electronic structure calculations of UNC, U(NC)2, and U(NC)4 in solid argon
Gong, Yu,Andrews, Lester,Liebov, Benjamin K.,Fang, Zongtang,Garner, Edward B.,Dixon, David A.
supporting information, p. 3899 - 3902 (2015/10/19)
Reactions of laser-ablated U atoms with (CN)2 produce UNC, U(NC)2, and U(NC)4 as the major products, identified from their Ar matrix infrared spectra and precursors partially and fully substituted with 13C and 15N. Mixed isotopic multiplets substantiate product stoichiometries. Band positions and quantum chemical calculations verify the isocyanide bonding. This journal is
