Synthesis and characterization of novel gold(III) complexes with polydentate N-donor ligands based on the pyridine and triazole heterocycles

Bortoluzzi, Marco; Scrivanti, Alberto; Reolon, Andrea; Amadio, Emanuele; Bertolasi, Valerio

doi:10.1016/j.inoche.2013.04.015

Cited by 6 publications

(2 citation statements)

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“…Complexation of Au III to the 1,2,3-triazolyl ring in water at room temperature (Scheme 2) has already been suggested by Bortoluzzi and co-workers [19] and by us.…”

Section: Resultssupporting

confidence: 53%

Gold Nanoparticles Stabilized by Glycodendrimers: Synthesis and Application to the Catalytic Reduction of 4‐Nitrophenol

et al. 2014

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“…Complexation of Au III to the 1,2,3-triazolyl ring in water at room temperature (Scheme 2) has already been suggested by Bortoluzzi and co-workers [19] and by us.…”

Section: Resultssupporting

confidence: 53%

Gold Nanoparticles Stabilized by Glycodendrimers: Synthesis and Application to the Catalytic Reduction of 4‐Nitrophenol

et al. 2014

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“…Complexation of Au(III) with triazole molecules has been investigated by Bortoluzzi and co-workers. 24 In order to understand the complexation process between Au(III) and the trz dendrimers, a titration process was carried out by adding various amounts of HAuCl 4 into an as-prepared D 2 O solution of dendrimer. After stirring for 20 min, the reaction was monitored by 1 H NMR spectroscopy.…”

Section: ■ Introductionmentioning

confidence: 99%

“Click” Synthesis of Nona-PEG-branched Triazole Dendrimers and Stabilization of Gold Nanoparticles That Efficiently Catalyze p-Nitrophenol Reduction

Echeverría

Moya

et al. 2014

Inorg. Chem.

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Two new water-soluble 1,2,3-triazole-containing nona-PEG-branched dendrimers are obtained with nine intradendritic 1,2,3-triazoles (trz). Addition of HAuCl4 in water to these dendrimers quantitatively leads to the intradendritic formation of AuCl3(trz) moieties subsequent to complete Cl(-) substitution by trz on Au(III), whereas the analogous complexation reaction of AuCl3 with a linear PEG trz ligand forms only an equilibrium between trz-coordinated Au(III) and Au(III) that is not coordinated to trz. Reduction of the dendrimer-Au(III) complexes to Au(0) by NaBH4 then leads to stabilization of gold nanoparticles (AuNPs) in water. The sizes of the AuNPs stabilized by the dendritic macromolecules are further controlled between 1.8 and 12 nm upon selecting the stoichiometry of Au(III) addition per dendritic trz followed by NaBH4 reduction. With a 1:1 Au/trz stoichiometry, the AuNP size depends on the length of the PEG tether of the dendrimer; small dendrimer-encapsulated AuNPs are formed with PEG2000, whereas large AuNPs are formed with PEG550. With Au/trz stoichiometries larger than unity, Au(III) is reduced outside the macromolecule, resulting in the formation of large interdendritically stabilized AuNPs. The formation of very small and only mildly stabilized AuNPs by neutral hydrophilic triazole ligands offers an opportunity for very efficient p-nitrophenol reduction by NaBH4 in water at the AuNP surface.

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Introducing Potential Hemilability into “Click” Triazoles and Triazolylidenes: Synthesis and Characterization of d⁶‐Metal Complexes and Oxidation Catalysis

2014

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Hemilabile ligands are known to impart remarkable properties to their metal complexes. Herein, we present arene half‐sandwich complexes of RuII, OsII, and IrIII with “click”‐derived 1,2,3‐triazole (L1) and 1,2,3‐triazol‐5‐ylidene (L2) ligands containing a potentially hemilabile thioether donor. Structural elucidation of the complexes revealed localization of double bonds within the triazole in L1 and a delocalized situation within the triazolylidene ring of L2. For complexes with L1, unusual coordination occurs through the less basic nitrogen “N2” of the 1,2,3‐triazole. All complexes were applied for the catalytic oxidation of benzyl alcohol to benzaldehyde using N‐methylmorpholine N‐oxide as sacrificial oxidant. Furthermore, oxidation of diphenylmethanol to benzophenone was also achieved by using low catalyst loadings in very good yields. These are rare examples of OsII–triazole, as well as of OsII–triazolylidene complexes with “click”‐derived ligands.

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Synthesis and characterization of novel gold(III) complexes with polydentate N-donor ligands based on the pyridine and triazole heterocycles

Cited by 6 publications

References 28 publications

Gold Nanoparticles Stabilized by Glycodendrimers: Synthesis and Application to the Catalytic Reduction of 4‐Nitrophenol

Gold Nanoparticles Stabilized by Glycodendrimers: Synthesis and Application to the Catalytic Reduction of 4‐Nitrophenol

“Click” Synthesis of Nona-PEG-branched Triazole Dendrimers and Stabilization of Gold Nanoparticles That Efficiently Catalyze p-Nitrophenol Reduction

Introducing Potential Hemilability into “Click” Triazoles and Triazolylidenes: Synthesis and Characterization of d⁶‐Metal Complexes and Oxidation Catalysis

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Synthesis and characterization of novel gold(III) complexes with polydentate N-donor ligands based on the pyridine and triazole heterocycles

Cited by 6 publications

References 28 publications

Gold Nanoparticles Stabilized by Glycodendrimers: Synthesis and Application to the Catalytic Reduction of 4‐Nitrophenol

Gold Nanoparticles Stabilized by Glycodendrimers: Synthesis and Application to the Catalytic Reduction of 4‐Nitrophenol

“Click” Synthesis of Nona-PEG-branched Triazole Dendrimers and Stabilization of Gold Nanoparticles That Efficiently Catalyze p-Nitrophenol Reduction

Introducing Potential Hemilability into “Click” Triazoles and Triazolylidenes: Synthesis and Characterization of d6‐Metal Complexes and Oxidation Catalysis

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Introducing Potential Hemilability into “Click” Triazoles and Triazolylidenes: Synthesis and Characterization of d⁶‐Metal Complexes and Oxidation Catalysis