Gold(0) Nanoparticles for Selective Catalytic Diboration

Ramı́rez, Jesús; Sanaú, Mercedes; Fernández, Elena

doi:10.1002/anie.200800541

Cited by 69 publications

(34 citation statements)

References 68 publications

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“…[20] However, it should be noted that short distances do not unambiguously prove the presence of ab ond between the metal centers because they can be caused by the ligand environment and packing effects. This can be illustrated, for example, by complex [(AuI) 2 (binap)] [21] (BINAP = 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl), with ac orrespondinga ngle of 172.208,w hich is attained withouts hort AuÀAu separations. This can be illustrated, for example, by complex [(AuI) 2 (binap)] [21] (BINAP = 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl), with ac orrespondinga ngle of 172.208,w hich is attained withouts hort AuÀAu separations.…”

Section: Synthesis and Structural Characterizationmentioning

confidence: 99%

Luminescence Thermochromism of Gold(I) Phosphane–Iodide Complexes: A Rule or an Exception?

Glebko

Dau

Melnikov

et al. 2018

Chemistry A European J

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A series of gold(I) iodide complexes 1-11 have been prepared from di-, tri-, and tetraphosphane ligands. Crystallographic studies reveal that the di- (1-7) and tetrametallic (11) compounds feature linearly coordinated gold(I) ions with short aurophilic contacts. Their luminescence behavior is determined by the combined influence of the phosphane properties, metal-metal interaction, and intermolecular lattice-defined interactions. The proposed variable contribution of (X+M)-centered (X=halogen; M=metal) and XLCT (halogen to ligand charge transfer) electronic transitions into the lowest lying excited state, which is influenced by supramolecular packing, is presumably responsible for the alteration of room-temperature emission color from green (λ=545 nm, for 11) to near-IR (λ=698 nm, for 2). Dinuclear compounds 6 and 7 exhibit distinct luminescence thermochromism with a blueshift up to 5750 cm upon cooling. Such dramatic change of emission energy is assigned to the presence of two coupled triplet excited states of ππ* and (X+M)C/ XLCT nature, the presence of which depends on both molecular structure and the crystal lattice arrangement.

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Section: Synthesis and Structural Characterizationmentioning

confidence: 99%

Luminescence Thermochromism of Gold(I) Phosphane–Iodide Complexes: A Rule or an Exception?

Glebko

Dau

Melnikov

et al. 2018

Chemistry A European J

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“…Small gold and silver nanoparticles (NPs) have attracted great interest for decades both in fundamental and applied research, especially in the fields of medicine, luminescence, catalysis, nanoelectronics, drug delivery, bioanalysis, etc . These applications play an important role in our modern life.…”

Section: Introductionmentioning

confidence: 99%

Chiral Noble Metal Nanoparticles and Nanostructures

Karimova

Aikens

2019

Part & Part Syst Charact

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The origins of chirality and chiroptical properties in ligand‐protected gold and silver nanoparticles (NPs) are considered herein. Current conceptual models including the chiral core model, dissymmetric field model, and chiral footprint model are described as mechanisms that contribute to the understanding of chirality in these systems. Then, recent studies on thiolate‐stabilized gold NPs, phosphine‐stabilized gold NPs, multi‐ligand‐stabilized silver NPs, and DNA‐stabilized silver NPs are discussed. Insights into the origin of chiroptical properties including reasons for large Cotton effects in circular dichroism spectra are considered using both experimental and theoretical data available. Theoretical calculations using density functional theory (DFT) and time‐dependent DFT methods are found to be extremely useful for providing insights into the origin of chirality. The origin of chirality in ligand‐protected gold and silver NPs can be considered to be a complex phenomenon, arising from a combination of the three conceptual models.

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“…Selected bond distances (Å) and angles ( • ): Au1-P1 2.223(1), Au1-Cl1 2.282(2), P1-Au1-Cl1 173.58(6), C1-P1-Au1 119.7(2), C8-P1-Au1 108.1(2), C14-P1-Au1 113.5(2). Selected bond distances (Å) and angles ( • ): Au1-P1 2.223(1), Au1-Cl1 2.282(2), P1-Au1-Cl1 173.58(6), C1-P1-Au1 119.7(2), C8-P1-Au1 108.1(2), C14-P1-Au1 113.5(2).…”

mentioning

confidence: 99%

Chiral undecagold clusters: synthesis, characterization and investigation in catalysis

et al. 2010

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Enantiopure undecagold clusters protected by chiral atropisomeric diphosphine ligands (P^P) have been synthesized by the stoichiometric reduction of the corresponding (P^P)(AuCl)(2) complexes with NaBH(4). The molecular mono-disperse [Au(11)(P^P)(4)Cl(2)]Cl species have been thoroughly characterized using an array of analytical techniques. (31)P NMR experiments suggested the presence of a slow intramolecular ligand exchange process. Circular dichroism measurements showed that enantiomeric clusters display mirror-image chiroptical activity. Such undecagold clusters containing two chloride ligands bound to the peripheral Au(I) atoms were expected to display a carbophilic Lewis acidity similar to the well-documented molecular Au(I) complex catalysts. Chloride abstraction, performed to generate active Au(+) sites, induced the Au(11) cluster evolution to larger gold clusters and nanoparticles, together with Au(I) complexes, which, in fact, perform the catalysis. This result was corroborated by running an asymmetric tandem hydroarylation-carbocyclization reaction, for which the enantiomeric excesses obtained with Au(11) clusters are similar to those reported using Au(I) complexes.

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Gold(0) Nanoparticles for Selective Catalytic Diboration

Cited by 69 publications

References 68 publications

Luminescence Thermochromism of Gold(I) Phosphane–Iodide Complexes: A Rule or an Exception?

Luminescence Thermochromism of Gold(I) Phosphane–Iodide Complexes: A Rule or an Exception?

Chiral Noble Metal Nanoparticles and Nanostructures

Chiral undecagold clusters: synthesis, characterization and investigation in catalysis

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