Electron Emission of Gas-Phase [Au25(SG)18-6H]7− Gold Cluster and Its Action Spectroscopy

Hamouda, Ramzi; Bellina, Bruno; Bertorelle, Franck; Compagnon, Isabelle; Antoine, Rodolphe; Broyer, M.; Rayane, D.; Dugourd, Philippe

doi:10.1021/jz101287m

Cited by 42 publications

(36 citation statements)

References 41 publications

(90 reference statements)

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“…Observed charge states in excess of ±2 are normally only achievedby electrochemical methods 5,66 or by the use of ligands that bear charge. 18,19,25,67 The fixed charge of the IBANs has a strong effect on interactions between the nanoclusters and their environment, increasing solubility in polar aprotic solvents such as DMF 68 and attracting counterions to the IBAN surface. The associating counterions appear to be principally Ag + , as evidenced by the presence of Ag-IBAN adducts in the mass spectra (Figure S1).…”

Section: Resultsmentioning

confidence: 99%

Ag44(SR)304−: a silver–thiolate superatom complex

et al. 2012

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Intensely- and broadly-absorbing nanoparticles (IBANs)of silver protected by arylthiolates were recently synthesized and showed unique optical properties, yet question of their dispersity and their molecular formulas remained. Here IBANs are identified as a superatom complex with a molecular formula of Ag44(SR)304− and an electron count of 18.This molecular character is shared by IBANs protected by 4-fluorothiophenol or 2-naphthalenethiol. The molecular formula and purity is determined by mass spectrometry and confirmed by sedimentation velocity-analytical ultracentrifugation. The data also give preliminary indications of a unique structure and environment for Ag44(SR)304−.

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Section: Resultsmentioning

confidence: 99%

Ag44(SR)304−: a silver–thiolate superatom complex

et al. 2012

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“…This fragmentation of "surface groups" has already been observed in the case of gold nanoclusters. [36][37][38][39] The MS/MS spectrum is also characterised by 1) low-mass singly charged DOTAGA ligands, complexed or not to Gd 3 + , and polysiloxane fragments made up of APTES and TEOS, and 2) two intense doubly and triply charged ions between 1500 and 2000 Th (Figure 7 c). Interestingly, these peaks correspond to molecular masses of about 3520 and 4910 Da the sum of which is roughly equal to that of the initial SRP, approximately 8500 Da.…”

Section: Determination Of the Srp Molecular Structurementioning

confidence: 99%

A Top‐Down Synthesis Route to Ultrasmall Multifunctional Gd‐Based Silica Nanoparticles for Theranostic Applications

Mignot

Truillet

Lux

et al. 2013

Chemistry A European J

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New, ultrasmall nanoparticles with sizes below 5 nm have been obtained. These small rigid platforms (SRP) are composed of a polysiloxane matrix with DOTAGA (1,4,7,10-tetraazacyclododecane-1-glutaric anhydride-4,7,10-triacetic acid)-Gd(3+) chelates on their surface. They have been synthesised by an original top-down process: 1) formation of a gadolinium oxide Gd2O3 core, 2) encapsulation in a polysiloxane shell grafted with DOTAGA ligands, 3) dissolution of the gadolinium oxide core due to chelation of Gd(3+) by DOTAGA ligands and 4) polysiloxane fragmentation. These nanoparticles have been fully characterised using photon correlation spectroscopy (PCS), transmission electron microscopy (TEM), a superconducting quantum interference device (SQUID) and electron paramagnetic resonance (EPR) to demonstrate the dissolution of the oxide core and by inductively coupled plasma mass spectrometry (ICP-MS), mass spectrometry, fluorescence spectroscopy, (29)Si solid-state NMR, (1)H NMR and diffusion ordered spectroscopy (DOSY) to determine the nanoparticle composition. Relaxivity measurements gave a longitudinal relaxivity r1 of 11.9 s(-1) mM(-1) per Gd at 60 MHz. Finally, potentiometric titrations showed that Gd(3+) is strongly chelated to DOTAGA (complexation constant logβ110 =24.78) and cellular tests confirmed the that nanoconstructs had a very low toxicity. Moreover, SRPs are excreted from the body by renal clearance. Their efficiency as contrast agents for MRI has been proved and they are promising candidates as sensitising agents for image-guided radiotherapy.

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“…In the case of Au NCs (i.e., for Au:Zw 1:1, Au:Zw 1:2, and Au:Zw 1:5), mass spectrometry is reckoned as a suited technique to determine the full size and the structure of metal NCs. [35][36][37][38][39][40] We previously attempted to determine specific magic clusters using matrix-assisted laser desorption ionization / time of flight (MALDI-Tof) technique on those types of NCs without any success. 28 Here, the high mass setting is optimized for the Au:Zw NCs.…”

Section: All Article Content Except Where Otherwise Noted Is Licensmentioning

confidence: 99%

Zwitterion functionalized gold nanoclusters for multimodal near infrared fluorescence and photoacoustic imaging

et al. 2017

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Electron Emission of Gas-Phase [Au₂₅(SG)₁₈-6H]⁷⁻ Gold Cluster and Its Action Spectroscopy

Cited by 42 publications

References 41 publications

Ag44(SR)304−: a silver–thiolate superatom complex

Ag44(SR)304−: a silver–thiolate superatom complex

A Top‐Down Synthesis Route to Ultrasmall Multifunctional Gd‐Based Silica Nanoparticles for Theranostic Applications

Zwitterion functionalized gold nanoclusters for multimodal near infrared fluorescence and photoacoustic imaging

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