Gas Phase Ion Chemistry of Transition Metal Clusters: Production, Reactivity, and Catalysis

O’Hair, Richard A. J.; Khairallah, George N.

doi:10.1023/b:jocl.0000041199.40945.e3

Cited by 196 publications

(133 citation statements)

References 55 publications

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“…2 produced numerous examples of novel molecular species [6][7][8]. Several negatively charged metal chalcogenide clusters, namely sulfides [9][10][11] and oxides [8,[12][13][14][15][16][17][18][19][20][21][22] have been previously generated by LDI and studied by Fourier transform ion cyclotron resonance mass spectrometry (FTICR/MS).…”

mentioning

confidence: 99%

Molecular Uranates: Laser Synthesis of Uranium Oxide Anions in the Gas Phase

Marçalo

Santos²,

Matos³

et al. 2009

Inorg. Chem.

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mentioning

confidence: 99%

Molecular Uranates: Laser Synthesis of Uranium Oxide Anions in the Gas Phase

Marçalo

Santos²,

Matos³

et al. 2009

Inorg. Chem.

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“…This colouring is due to the size effect exhibited by gold particles with dimensions of the order of nanometers, and has become one of the recent areas of focus in research on AuNPs [14]. The catalysis of AuNPs for gas-phase [15] and liquid-phase [16] redox reactions is now an expanding area.…”

Section: Introductionmentioning

confidence: 99%

Microwave green synthesis of PVP-stabilised gold nanoparticles and their adsorption behaviour for methyl orange

Pal

Deb

2012

Journal of Experimental Nanoscience

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In this work, gold nanoparticles (AuNPs) were prepared by the microwave irradiation method and comparative studies on the removal of dye by adsorption on activated carbon (AC) and polyvinylpyrrolidone (PVP)-supported AuNPs-coated AC were made. The uniform and stable AuNPs were prepared by the reduction of gold chloride (HAuCl 4 ) using glucose as reducing agent and PVP as a stabilising and capping agent. The resulting AuNPs were characterised by transmission electron microscopy (TEM) and UV-Vis spectroscopy. The TEM technique showed the presence of AuNPs with an average size of 20 nm. The effect of various process parameters has been investigated by following the column adsorption technique at room temperature. Percentage removal of dye increased with the decrease in initial concentration and increased with the increase in contact time. Adsorption data were modelled with the Freundlich isotherms. The Freundlich isotherm model has been applied to the equilibrium adsorption data. Desorption studies were made to elucidate recovery of the adsorbate and adsorbent for the economic competitiveness of the removal system. The adsorption capacity of the water-desorbed adsorbate reduced from 97% to 60% for n ¼ 6 cycles.Keywords: activated carbon; adsorption; gold nanoparticles; microwave irradiation; polyvinylpyrrolidone IntroductionMetal nanoparticles with controlled size and shape are of great interest because of their morphology-dependent properties [1] and potential applications in many fields [2]. Metal nanoparticles have attracted considerable interest because of their novel properties and their potential applications [3]. Binding capacity of noble metal nanoparticles with dyes are more as compared to other nanoparticles. Novel metal crystallites such as silver and gold provide a more interesting research field due to their close-lying conduction and valence bands in which electrons move freely. The free electrons give rise to a surface plasmon absorption band that depends on both the particle size and chemical surrounding. Right now, the shape-controlled synthesis of nanoparticles has been achieved to regulate the particle growth either by using geometric templates [4], or by using some additive, such as polymers [5] or inorganic anions [6]. Accurate controls of size, composition, morphology and stability and the use of environmentfriendly procedures are highly desirable for the synthesis of nanoparticles. There have been a number of techniques, for nanoparticles synthesis, developed over the years using a range of metals [7]. The most widely used substances for the stabilisation of metal nanoparticles are

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“…Gas phase chemistry of metal clusters has recently gained more interest due to the fact that clusters are good models for surfaces and heterogeneous catalysis, they show unique reactivity and properties, and cluster research provides an ideal interface between experimental and theoretical work [1]. The method of LDI, where no matrix is necessary, can be used successfully to generate gas-phase clusters, which, then can be immediately characterised using mass spectrometry [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Phenylcopper(I) clusters in the gas phase obtained by laser desorption/ionization from bis(dibenzoylmethane)copper(II)

et al. 2010

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It has been demonstrated that phenylcopper(I)-containing clusters are generated in the gas phase from bis(dibenzoylmethane) copper(II) (Cu(dbm)2) by laser desorption/ ionization (LDI) method. For example, the [Cu5dbm2(C6H5)2]+ ion can be considered as consisting of two Cudbm molecules, two CuC6H5 molecules and a Cu+ cation. The [Cu5(C6H5)4]+ ion can be considered as phenylcopper(I) cluster (consisting of four phenylcopper molecules) ionized by additional Cu+ cation. Results from MS/MS (tandem mass spectrometry) experiments have confirmed the presence of phenylcopper molecules in the analyzed clusters. Ease of preparation of dibenzoylmethane-metal complexes and straightforward method to obtain LDI mass spectra offer a wide range of possibilities to study similar organometallic clusters in the gas phase.

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Gas Phase Ion Chemistry of Transition Metal Clusters: Production, Reactivity, and Catalysis

Cited by 196 publications

References 55 publications

Molecular Uranates: Laser Synthesis of Uranium Oxide Anions in the Gas Phase

Molecular Uranates: Laser Synthesis of Uranium Oxide Anions in the Gas Phase

Microwave green synthesis of PVP-stabilised gold nanoparticles and their adsorption behaviour for methyl orange

Phenylcopper(I) clusters in the gas phase obtained by laser desorption/ionization from bis(dibenzoylmethane)copper(II)

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