Detail of "13462-90-3"

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Ultraviolet reflectance and electronic states of layered nickel halides studied with synchrotron radiation

Ultraviolet reflectance and electronic states of layered nickel halides studied with synchrotron radiation.Some chemicals with cas registry numbers like 13462-90-3 and 13462-88-9 are also used. Pollini, I.; Thomas, J.; Jezequel, G.; Lemonnier, J. C.; Lenselink, A. (Dip. Fis., Univ. Studi Milano, Milan I-20133, Italy). Phys. Rev. B: Condens. Matter, 29(8), 4716-26 (English) 1984. CODEN: PRBMDO. ISSN: 0163-1829. DOCUMENT TYPE: Journal CA Section: 73 (Optical, Electron, and Mass Spectroscopy and Other Related Properties) The real (e1) and imaginary (e2) parts of the dielec. function, together with the energy-loss function, -Im[1/e(E)], of freshly cleaved crystals of NiCl2, NiBr2, and NiI2 were obtained in the region 2-31 eV by Kramers-Kronig anal. of near-normal-incidence reflectance spectra. The spectra of NiI2 were obtained over the entire region at 300 and 30 K, and those of NiCl2 and NiBr2 were measured at 30 K only from 2 to 11 eV. The results can be described in terms of charge-transfer transitions, interband transitions, and plasma oscillations. The low-temp. spectra of the materials reveal the presence of exciton structures. Plasma resonance effects were identified in the high-energy region (15-20 eV). The optical spectra of NiX2 (X = Cl, Br, I) were analyzed in terms of the known band structures of NiCl2 and NiBr2. Nearly all of the main spectral features beyond the energy gap can be identified in terms of direct interband transitions at the symmetry points G, Z, F, and L and along symmetry lines of the Brillouin zone. The energy gap is assigned to G3- ? G1+ transitions in NiCl2 (8.72 eV), NiBr2 (7.90 eV), and NiI2 (6.26 eV). Finally, the interpretation of the satellite exciton at 5.65 eV in NiI2 (30 K) and at 6.50 eV in NiBr2 (30 K) is discussed in terms of the triplet exciton state. .

Acetic acid production via low-pressure, nickel-catalyzed methanol carbonylation

Acetic acid production via low-pressure, nickel-catalyzed methanol carbonylation.Some chemicals with cas registry numbers like 13462-90-3 and 998-40-3 are also used. Rizkalla, Nabil (Halcon SD Group, Inc., Montvale, NJ 07645, USA). ACS Symp. Ser., 328(Ind. Chem. C1 Processes), 61-76 (English) 1987. CODEN: ACSMC8. ISSN: 0097-6156. DOCUMENT TYPE: Journal CA Section: 45 (Industrial Organic Chemicals, Leather, Fats, and Waxes) In the NiI2-catalyzed title reaction, promoters such as phosphines, alkali metals, and tin stabilize the Ni catalyst and enhance the reaction rate under mild reaction conditions. Combining two different promoters gives max. reaction rate. H and Group VIB metals promote reaction rate and catalyst stability. The reaction is 1st order with respect to iodine and Ni and is retarded by the presence of high water or MeOH [67-56-1] concns. and high CO partial pressure. A mechanism is proposed to explain the function of the different promoters and reaction parameters. .