Luminescent phosphine gold(I) alkynyl complexes. Highlights from 2010 to 2018

Pujadas, M. Magdalena Polo; Rodrı̀guez, Laura

doi:10.1016/j.ccr.2020.213179

Cited by 51 publications

(80 citation statements)

References 57 publications

(65 reference statements)

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“…Absorption λ max (nm) ( The electronic absorption spectra of all the complexes ( Figure 1) showed an intense band with vibronic resolution at 380-420 nm. These bands displayed the same profile as the corresponding spectrum of the ligand 1, but, as is commonly observed [11], they were ca. 20 nm red-shifted due to coordination to the metal atom.…”

Section: Compoundsupporting

confidence: 62%

“…This creates a new possibility of the coordination of metallic complexes via the formation of M-C≡C bonds. The linearity of the M-C≡C moiety and the preference of gold(I) for linear coordination makes alkynyl gold(I) compounds [10,11] attractive candidates for the design of discotic molecules derived from a DBC core. 2 of 11 Gold(I) complexes are very well known to display aurophilic (Au(I)···Au(I)) interactions, and this particular property modulates the energy of excited states while retaining the coordination sphere and remaining capable of considerably affecting the photophysical properties of the polymetallic molecules [12].…”

Section: Introductionmentioning

confidence: 99%

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Luminescent Tetranuclear Gold(I) Dibenzo[g,p]chrysene Derivatives: Effect of the Environment on Photophysical Properties

et al. 2020

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A new 2,7,10,15-tetraethynyldibenzo[g,p]chrysene ligand (1) and two tetranuclear gold(I) derivatives containing PPh3 (3) and PMe3 (4) phosphines were synthesized and characterized by 1H and 31P NMR, IR spectroscopy, and high-resolution mass spectrometry. The compounds were studied in order to analyze the effect of the introduction of gold(I) on the supramolecular aggregation and photophysical properties. Absorption and emission spectra displayed broad bands due to the establishment of π π interactions as an indication of intermolecular contacts and the formation of aggregates. A decrease of the recorded quantum yield (QY) of the gold(I) derivatives was observed compared to the uncomplexed ligand. The introduction of the complexes into poly methyl methacrylate (PMMA) and Zeonex 480R matrixes was analyzed, and an increase of the measured QY of 4 in Zeonex was observed. No phosphorescent emission was detected.

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Section: Compoundsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Luminescent Tetranuclear Gold(I) Dibenzo[g,p]chrysene Derivatives: Effect of the Environment on Photophysical Properties

et al. 2020

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“…This band is ca. 50 nm red-shifted upon coordination to the metal atom, as commonly observed for other chromophores coordinated to the Au(I) unit ( Figure 1 ) [ 36 , 37 ]. The emission of 1 and 2 display two bands, one at ca.…”

Section: Resultssupporting

confidence: 58%

“…The 31 P-NMR spectra indicate the presence of a main peak at ca. −49 and −27 ppm for 1 and 2 respectively in accordance with P-donor coordination to the metal center [ 36 , 37 ]. HRESI-MS spectrometry gives the final evidence of the correct formation of the compounds with the corresponding molecular [M + H].…”

Section: Resultsmentioning

confidence: 99%

Using Room Temperature Phosphorescence of Gold(I) Complexes for PAHs Sensing

et al. 2021

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The synthesis of two new phosphane-gold(I)–napthalimide complexes has been performed and characterized. The compounds present luminescent properties with denoted room temperature phosphorescence (RTP) induced by the proximity of the gold(I) heavy atom that favors intersystem crossing and triplet state population. The emissive properties of the compounds together with the planarity of their chromophore were used to investigate their potential as hosts in the molecular recognition of different polycyclic aromatic hydrocarbons (PAHs). Naphthalene, anthracene, phenanthrene, and pyrene were chosen to evaluate how the size and electronic properties can affect the host:guest interactions. Stronger affinity has been detected through emission titrations for the PAHs with extended aromaticity (anthracene and pyrene) and the results have been supported by DFT calculation studies.

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“…These compounds show a remarkable stability in vitro and diverse biological properties can be induced by different ancillary ligands (L). [2][3][4] These gold complexes also display very interesting optical properties, due to both the heavy atom effect, which is able to induce phosphorescence emission, and the versatile attitude of the alkynyl moiety (behaving as π-donor, π-acceptor and σ-donor), that can tune the emission behavior in both isolated complexes [5] and molecular rods. [6] Recently, gold-alkynyl complexes have become attractive also in the framework of gold catalysis [7][8][9][10] with the discovery of the dual-activation mode (dual σ,π-catalysis).…”

Section: Introductionmentioning

confidence: 99%

Tuning the Gold(I)‐Carbon σ Bond in Gold‐Alkynyl Complexes through Structural Modifications of the NHC Ancillary Ligand: Effect on Spectroscopic Observables and Reactivity

2021

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Understanding the features of the gold(I)-carbon σ bond and its modulation induced by an ancillary ligand has become fundamental for the purposes of ligand design, due to the increasing interest towards gold(I)-alkynyl complexes and their wide range of applications. We carry out a systematic computational analysis of 16 gold(I)-acetylide complexes bearing different N-Heterocyclic Carbenes (NHCs) as ancillary ligands [NHCÀ Au(I)À CCH]. The results show that the strength and features of the AuÀ C bond can be efficiently tuned by performing specific structural modifications on the NHC, enabling a more efficient π communication between the alkynyl and the ancillary ligand. We also demonstrate that the effect of the bond modulation can be revealed via NMR spectroscopy, as highlighted by the tight correlation between the computed nuclear shielding constants and the bonding parameters. Finally, we show that, for the dual-gold-catalyzed Bergman cyclization as case study, suitable structural modifications on the NHC ligand, which modulate the π-acidity of the metal fragment σ-coordinated to an enediyne substrate, could affect the reaction barrier and the thermodynamic stability of the product. All the reported results can be well rationalized in the framework of distortion/interaction analysis, which has been recently extended to the dual (σ,π-type) Au catalytic systems by Alabugin et al (J. Am. Chem. Soc. 2017, 137, 3406-3416).

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Luminescent phosphine gold(I) alkynyl complexes. Highlights from 2010 to 2018

Cited by 51 publications

References 57 publications

Luminescent Tetranuclear Gold(I) Dibenzo[g,p]chrysene Derivatives: Effect of the Environment on Photophysical Properties

Luminescent Tetranuclear Gold(I) Dibenzo[g,p]chrysene Derivatives: Effect of the Environment on Photophysical Properties

Using Room Temperature Phosphorescence of Gold(I) Complexes for PAHs Sensing

Tuning the Gold(I)‐Carbon σ Bond in Gold‐Alkynyl Complexes through Structural Modifications of the NHC Ancillary Ligand: Effect on Spectroscopic Observables and Reactivity

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