Results 61 to 70 of about 124,244 (129)

Iron Porphyrin-Based Composites for Electrocatalytic Oxygen Reduction Reactions

Molecules
The oxygen reduction reaction (ORR) is one of the most critical reactions in energy conversion systems, and it facilitates the efficient conversion of chemical energy into electrical energy, which is necessary for modern technology.
Stennard Leetroy George, Linkai Zhao, Ziyi Wang, Zhaoli Xue, Long Zhao   +4 more
doaj   +1 more source

Aromatic Metal Corrosion Inhibitors

Corrosion and Materials Degradation
Molecular inhibitors added to the corrosive medium attacking metallic materials are a well-established way of combating corrosion. The inhibitive action proceeds via adsorption of the inhibitor on the surface to be protected.
Jessica Roscher, Dan Liu, Xuan Xie, Rudolf Holze   +3 more
doaj   +1 more source

Dual Substituent Parameter Modeling of Theoretical, NMR and IR Spectral Data of 5-Substituted Indole-2,3-diones

Molecules, 2002
Correlations of AM1 and PM3 theoretical data, 13C-NMR substituent chemical shifts (13C-SCS) and IR carbonyl group wave numbers [ν(C3═O)] were studied using dual substituent parameter (DSP) models for 5-substituted indole-2,3-diones.
Zora Å usteková, Katri Laihia, Walter M.F. Fabian, Erkki Kolehmainen, Mária Å amalíková, Alexander Perjéssy, Hanan A. Radhy, Ghazwan F. Fadhil   +7 more
doaj   +1 more source

Chemical approach for controlling nadimide cure temperature and rate with maleimide [PDF]

, 1985
Polyimide resins suitable for use as composite matrix materials are formed by copolymerization of maleic and norbornenyl endcapped monomers and oligomers.
Lauver, R. W.
core   +2 more sources

Quantitative Analysis of Substituent Effects in Cu(II) and Co(II) Benzimidazole Complexes: Stability Constants Determined via Acetate-Mediated Synthesis and Benesi–Hildebrand Method Correlated with Hammett σ Parameters

Chemistry
This study presents a quantitative investigation of substituent effects on the stability of 1:2 complexes formed between para-substituted 2-phenylbenzimidazole ligands and Cu(II) or Co(II) ions.
Zoltán Köntös, Flóra Stedra, Viktória Ngo Hang   +2 more
doaj   +1 more source

Competitive Heavy‐Atom Tunneling Reactions Controlled Through Electronic Effects

ChemistryEurope
Controlling QMT reactivity remains exceptionally challenging and largely unexplored, as it requires rationales distinctly different from those used for classical chemical reactivity.
José P. L. Roque, Cláudio M. Nunes, Fumito Saito, Bastian Bernhardt, Rui Fausto, Peter R. Schreiner   +5 more
doaj   +1 more source

Atomic Charges from Machine-Learned Charge Densities: Consistency and Substituent Effects

Chemistry
Atomic charges are widely used to analyze molecular electronic structure and substituent effects, yet their numerical values and interpretations are inherently dependent on the adopted density partitioning scheme.
Xuejian Qin, Taoyuze Lv
doaj   +1 more source

Quantitative representation of reactivity, selectivity and site activation concepts in organic chemistry [PDF]

, 2004
Indexación: ScieloReactivity, selectivity and site activation are classical concepts in chemistry which are amenable to quantitative representation, in terms of static global, local and non local density response functions.
Contreras, Renato R., Parra-Mouche, Julia, Pérez, Patricia   +2 more
core  

Hyperconjugative stabilization of silicenium ions: kinetics of hydride abstractions from .beta.-element-substituted silanes [PDF]

, 1993
Basso, Nils, Goers, Solvig, Mayr, Herbert, Popowski, Eckhard   +3 more
core   +1 more source

Substituent effects on the electrical conductivities of the phenazine derivatives [PDF]

The and/or photoconductivities of 16 substituted phenazines having methoxy, hydroxy, chloro, nitro, amino or t-butyl group at 1-, 2-, 1, 6- or 2,7- positions of the phenazine ring measured by using the surface type cells.
Furuyama, S., Imoto, E., Inoue, H., Sugimoto, A.   +3 more
core   +1 more source