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Digitale Medien

Dibromo{N-[2-(diphenylphosphino)benzylidene]-2,6-diisopropylaniline-κ2N,P}nickel (2001)

Crossetti, Geraldo L. ; Filgueiras, Carlos A. L. ; Howie, R. Alan ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 57 (2001), S. 1279-1281

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ISSN: 1600-5759

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: In the title compound, [NiBr2(C31H32NP)], (I), the second reported example of a nickel–iminophosphine N,P-chelate in which the Ni atom has tetrahedral coordination, the Ni coordination is distorted as a consequence of the N—Ni—P chelate bite angle of 91.07 (6)° compensated by the Br—Ni—Br angle of 126.385 (18)°. In (I) and its analogue, viz. dichloro{[2-(4-isobutyloxazol-2-yl)phenyl]diphenylphosphine-N,P}nickel(II), the Ni—N and Ni—P distances are greater and the N—Ni—P ligand bite angles smaller than those observed in a series of related complexes with square-planar nickel.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270101013907

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Digitale Medien

Kinetic and mechanistic aspects for the tartaric acid oxidation by vanadium(V) in sulfuric acid medium (1998)

Takashima, Keiko ; Ziglio, Cláudio M. ; Ronconi, Célia M.

New York, NY : Wiley-Blackwell

International Journal of Chemical Kinetics 30 (1998), S. 55-61

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ISSN: 0538-8066

Schlagwort(e): Chemistry ; Physical Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Tartaric acid oxidation by vanadium(V) in sulfuric acid medium was investigated spectrophotometrically at 760 nm and 30°C by appearance of the vanadium(IV), as vanadyl. The reaction rate was determined under pseudo-first-order conditions with an excess of hydroxyacid over the oxidant concentration. The oxidation showed a first-order dependence with respect to vanadium(V) concentration and fractional orders with respect to tartaric acid and sulfuric acid concentrations, with no control and with constant ionic strength. The reaction rate is enhanced by an increase of ionic strength, and slightly reduced by a decrease of the dielectric constant of the medium. The activation parameters were calculated based on the rate constants determined in the 293 to 313 K interval. The proposed oxidation mechanisms and the derived rate laws are consistent with the experimental rate laws. © 1998 John Wiley & Sons, Inc. Int J Chem Kinet: 30: 55-61, 1998.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

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