Results 271 to 280 of about 2,359,589 (295)

A trinuclear Pt(ii) compound with short Pt–Pt–Pt contacts. An analysis of the influence of π–π stacking interactions on the strength and length of the Pt–Pt bond

Dalton Trans., 2006
In this work we report the first example of a trinuclear Pt(II) complex with Pt-Pt-Pt bonds that are not facilitated by direct intervention of bridging ligands but are partially held by the attractive pi-pi stacking interaction between the phenyl units of the 4,4'-dimethyl-2,2'-bipyridyl ligands.
Albert, Poater, Silvia, Moradell, Elena, Pinilla, Jordi, Poater, Miquel, Solà, M Angeles, Martínez, Antoni, Llobet   +6 more
openaire   +2 more sources

Monomeric Pt(II) and dimeric Pt-Pt and Pt-Pd complexes of a triazolo pyrimidine derivative

Journal of Inorganic Biochemistry, 1995
The ligand 5-methyl-[1,2,4]tr iazolo-[1,5-a]pyrimidine-7-ol (mtpOH) reacts wi th K2[PtCI 4] in 0.5 M hydrochloric acid yielding cis-[PtCI2(mtpOH)2].H20 (I). Dissolving this compound in a NaOH solution causes its decomposition and, from this solution, the dimeric complex [Pt2(mtpO)4].4H20 (11) crystallizes out. On the other hand, the reaction at 45°C of
J. Rodríguez, J.M. Salas, M.A. Romero, M. Quirós, R. Faure   +4 more
openaire   +1 more source

Isolation and characterization of a tetranuclear Pt–Fe⋯Fe–Pt intermediate en route to the trinuclear Pt–Fe–Pt cluster

Dalton Trans., 2017
An intermediate compound of a tetranuclear Pt–Fe⋯Fe–Pt complex in the synthetic process to form a trinuclear Pt–Fe–Pt complex by mixing the “amidate-hanging” Pt mononuclear complex and iron sources was successfully isolated and characterized by single-crystal X-ray analysis and several physical measurements.
Kazuhiro Uemura, Masahiro Taoka
openaire   +2 more sources

Ethylene Adsorption on Al2O3-Supported Pt, Pt–Sn, and Pt–In Catalysts

Journal of Catalysis, 1996
Abstract Ethylene adsorption on a family of Al2O3-supported Pt, Pt–Sn, and Pt–In catalysts was investigated at 300 K. The presence of Sn and In caused a decrease in ethylene uptake, similar to that observed in H2chemisorption measurements. Integral, isothermal heats of adsorption were measured and the heat of adsorption (Qad) values for C2H4on small ...
Fabio B. Passos, Martin Schmal, M.A. Vannice   +2 more
openaire   +1 more source

Oxidation of glucose and gluconate on Pt, Pt Bi, and Pt Au catalysts

Recueil des Travaux Chimiques des Pays-Bas, 1996
AbstractGlucose and gluconate aqueous solutions (2 mol/l) were oxidized with air (atmospheric pressure, 333K, pH 7) on active charcoal‐supported, platinum catalysts (catalytic ratios substrate/Pt ≥ 787); some catalysts were promoted with bismuth or gold. The activity of unpromoted Pt/C catalysts for glucose oxidation was comparable with that of Pd‐Bi/C
Besson, M., Fleche, G., Fuertes, P., Gallezot, P., Lahmer, F.   +4 more
openaire   +2 more sources

Comparison of methanol oxidations on Pt, Pt|Ru and Pt|Sn electrodes

Journal of Electroanalytical Chemistry, 1998
Abstract Electrochemical oxidations of methanol were compared on smooth or high area platinum, platinum|tin and platinum|ruthenium electrodes. On smooth platinum, while ruthenium promoted the catalytic activities steadily according to the coverage, tin showed an enhancing effect only for a short period of time because of the dissolution of tin from ...
Yu Morimoto, Ernest B Yeager
openaire   +1 more source

Studies of kinetics of HCOOH oxidation on Pt(100), Pt(110), Pt(111), Pt(510) and Pt(911) single crystal electrodes

Journal of Electroanalytical Chemistry, 1999
The kinetics of HCOOH oxidation via a reactive intermediate on Pt(100), Pt(110), Pt(111), Pt(510) and Pt(911) single crystal electrodes were studied quantitatively. The difficulty due to the self-poisoning involved in HCOOH oxidation has been overcome successfully by designing a programmed potential step procedure, which is based on results of kinetic ...
Sun, SG, Yang, YY
openaire   +2 more sources

The function of zeolite on Pt autoreduction and dispersion in Pt/L and Pt/? catalysts

Catalysis Letters, 1996
TPR, CO-FTIR and129Xe NMR spectroscopic techniques were used to measure the distribution of platinum species after the calcination of Pt/L and Pt/Β zeolites. Autoreduction which occurred in Pt/Β zeolite was avoided in the channel of L zeolite. Pt particles dispersed well and exhibited excellent reactivity for the aromatization ofn-hexane in L zeolite.
Jian Zheng, Jialu Dong, Qinhua Xu, Cheng Hu   +3 more
openaire   +1 more source

Effect of oxygen on the diffusion of Ni in Pt in Pt-Ni-Pt films

Journal of Applied Physics, 1981
We have studied the effect of oxygen on the diffusion of Ni into Pt in the Pt-Ni-Pt films. Below 400 °C, the diffusion rates of Ni into both Pt layers are greatly reduced by oxygen. Above 500 °C, however, Ni rapidly mixes with Pt layers, which leads to the formation of Ni oxide on the Pt surface in the presence of oxygen.
Chin-An Chang, W. K. Chu
openaire   +1 more source

Theoretical study on the methane activation reactions by Pt, Pt+, and Pt− atoms

Journal of Molecular Structure: THEOCHEM, 1993
Abstract The oxidative additions of CH4 to the ground and excited states of Pt, Pt−, and Pt+ species are studied by the symmetry-adapted cluster (SAC) and SAC-CI methods. The reaction path is examined by calculating the Hellmann-Feynman forces acting on C and H atoms of CH4. It involves the transition state and/or the activated complex.
M. Hada, H. Nakatsuji, H. Nakai, S. Gyobu, S. Miki   +4 more
openaire   +1 more source