Complexation of silver(I) cation by a series of heterosubstituted dipyridyl ligands

Brennan, Nathan L.; Barnes, Charles L.; Bosch, Eric

doi:10.1016/j.ica.2010.07.078

Cited by 11 publications

(5 citation statements)

References 10 publications

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“…To evaluate whether a trans -coordinating ligand may lead to a catalytically active species, we synthesized the geometrically restricted 1,2-bis(4-R-pyridin-2-yl)ethynyl)benzene, 2 (Figure and Scheme ). This bidentate ligand, and its close structural analogues, have earlier been successfully utilized in palladium, − mercury, copper, silver, and halonium complexes, ,− making its application in Au(III) chemistry plausible. Coordination of KAuCl 4 with 2 -H readily took place, resulting in precipitation of [( 2 -H)-Au(III)]Cl upon mixing in methanol (Scheme ).…”

Section: Resultsmentioning

confidence: 99%

Catalytic Activity of trans-Bis(pyridine)gold Complexes

et al. 2020

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Gold catalysis has become one of the fastest growing fields in chemistry, providing new organic transformations and offering excellent chemoselectivities under mild reaction conditions. Methodological developments have been driven by wide applicability in the synthesis of complex structures, whereas the mechanistic understanding of Au(III)-mediated processes remains scanty and have become the Achilles' heel of methodology development. Herein, the systematic investigation of the reactivity of bis(pyridine)-ligated Au(III) complexes is presented, based on NMR spectroscopic, X-ray crystallographic, and DFT data. The electron density of pyridines modulates the catalytic activity of Au(III) complexes in propargyl ester cyclopropanation of styrene. To avoid strain induced by a ligand with a nonoptimal nitrogen−nitrogen distance, bidentate bis(pyridine)−Au(III) complexes convert into dimers. For the first time, bis(pyridine)Au(I) complexes are shown to be catalytically active, with their reactivity being modulated by strain.

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Section: Resultsmentioning

confidence: 99%

Catalytic Activity of trans-Bis(pyridine)gold Complexes

et al. 2020

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“…In this work, the formation constants were determined by analysis of solution nuclear magnetic resonance (NMR) spectra. The chemical shifts from 1 H NMR spectra provide an estimate for the degree of electronic perturbation of the ligand species caused by the Ag + ions, thereby allowing the chemical structures and stability constants of silver complexes to be determined [26][27][28][29].…”

Section: Composition Of the Pa Electrolytementioning

confidence: 99%

“…-The [Ag(HPic) + ] and [Ag(Pic)] species at pH 3.0 and 6.5, respectively, are formed by the interaction between Ag + ions and the carboxylate group of the PA species. -Evidence of silver complexes formation was obtained by monitoring the changes in the chemical shifts (around 0.2 ppm) when titration of PA ligands (at every pH), with Ag + ions is performed [28,29]. -The values of calculated constants in concentrations (Kc) for [Ag(L) + ] complexes with 1:1 stoichiometry are given by reactions (2) and (3).…”

Section: Composition Of the Pa Electrolytementioning

confidence: 99%

Nucleation and growth of silver nanostructures onto HOPG electrodes in the presence of picolinic acid

Vazquez¹,

Lacconi²

2013

Journal of Electroanalytical Chemistry

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“…Organic & Biomolecular Chemistry silver, 28,47,48 iron, 49 palladium, 28,47,[50][51][52][53][54][55][56] mercury, 57 gold, 58 and even of carbenes 59 with several of these complexes having shown synthetically useful catalytic activities. 45,51,[54][55][56]58 Experimental section was used to process the NMR spectra.…”

Section: Papermentioning

confidence: 99%