Miguel Monge

Miguel Monge
Universidad de La Rioja (Spain) | UNIRIOJA · Chemistry

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164
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4,901
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Citations since 2017
46 Research Items
1990 Citations
20172018201920202021202220230100200300400
20172018201920202021202220230100200300400
20172018201920202021202220230100200300400
20172018201920202021202220230100200300400
Introduction
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Publications

Publications (164)
Article
Full-text available
New luminescent heterometallopolymers [(Au‐C6F5)m (AgOSO2CF3)n (PVP)] with different Au:Ag molar ratios were synthesized. The luminescent emissions of these polymers are strongly dependent on the temperature, excitation wavelengths and the Au(I):Ag(I) molar ratio. The incorporation of a precise amount of Ag(I) atoms in the backbone of [(Au‐C6F5)m (...
Article
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TiO2 nanoparticles (NPs) were modified to obtain photocatalysts with different composition sophistication and displaying improved visible light activity. All of them were evaluated in the photodegradation of ciprofloxacin. The band gap of TiO2 NPs was successfully tailored by the formation of an N-doped porous carbon (NPC)-TiO2 nanohybrid through t...
Article
Full-text available
The photocatalytic degradation of paracetamol (a common analgesic also known as acetaminophen) in ultrapure water with different photocatalytic systems was performed under ultraviolet or visible irradiation. The photocatalysts employed were: commercial Degussa-P25 TiO 2 and Au–TiO 2 under UVA irradiation (365 nm) and g-C 3 N 4 and Au-g-C 3 N 4 unde...
Article
Full-text available
The doubly-aurated [{Au(PMe 3 )} 2 (μ- S , N ¹ -2-thiocytosinate)] ⁺ cation breaks up in water solution to form a strongly-coloured and photoluminescent neutral aurophilic oligomer.
Article
Earth-abundant, cheap and non-toxic zinc-based coordination compounds are drawing research attention as promising candidates for various applications, such as photoluminescent materials and anticancer agents. In this paper we report six...
Article
Full-text available
Differences in the photocatalytic degradation rates of naproxen (a nonsteroidal anti-inflammatory drug) in ultrapure water and tap water were assessed using g-C3N4 nanosheets as photocatalyst and irradiating with natural sunlight and low-power (4×10 W) white light LEDs. The graphitic carbon nitride (g-C3N4) photocatalyst was synthesised and charact...
Article
Full-text available
The reaction of the polymeric heterometallic compound [{Au(C 6 Cl 5 ) 2 }Ag] n with the macrocyclic ligands 1‐aza‐4,7,10‐trithiacyclododecane ( L 1 ), 1,7‐dithia‐4,11‐diazacyclotetradecane ( L 2 ), 1‐aza‐4,10‐dithia‐7‐oxacyclododecane ( L 3 ) in tetrahydrofuran (THF) and 1:1 reaction molar ratio affords the new Au(I)/Ag(I) complexes [{Au(C 6 Cl 5 )...
Article
Herein, the syntheses of [{Au(9N-adeninate)}2(μ-dmpe)] (2, dmpe = 1,2-bis(dimethylphosphino)ethane) and its chloride precursor [(AuCl)2(μ-dmpe)] (1) are described. X-ray diffraction of 2 reveals a short intramolecular aurophilic interaction (2.9921(7) Å), which is present even when 2 crystallizes from its own hydrometallogel (3.0512(3) Å). This int...
Article
Small size AuAg colloidal nanoparticles (AuAg NPs) are prepared through the mild decomposition of the organometallic precursor [Au2Ag2(C6F5)4(OEt2)2]nin THF, using polyvinylpyrrolidone (PVP) as the stabilizing polymer. These nanoparticles are directly deposited on the surface of TiO2NPs through impregnation in solution at RT or under hydrothermal c...
Article
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Au-Ag/g-C3N4 nanohybrids 2–3 were synthesized by the one-pot self-reduction of the organometallic precursor [Au2Ag2(C6F5)4(OEt2)2]n in the presence of graphitic carbon nitride (g-C3N4), leading to two populations of alloyed Au-Ag nanoparticles (NPs) of different size and composition on the surface of g-C3N4, i.e., Ag-enriched Au-Ag NPs of smaller s...
Article
The photocatalytic degradation of sodium diclofenac (a nonsteroidal anti-inflammatory drug) in both ultrapure water and tap water with nanosheets of graphitic carbon nitride (g-C3N4) as catalyst and utilising two different sources of visible light (low-power (4×10 W) white light LEDs and natural sunlight) was carried out and compared. The highest d...
Article
We have studied computationally the Au-M (M = Ge, Sn, Pb) bonding trends in a series of model systems [(PH3)3Au-(MCl3)] (M = Ge (4), Sn (5), Pb (6)). For this, we have fully optimized the model systems at the MP2 level of theory, computing the Au-M bonding energy at the equilibrium distances applying the counterpoise (cp) correction to the basis-se...
Article
An in-depth study of the molecular rearrangement of the complex [Au(N9-adeninate)(PTA)] (1), promoted in aqueous solution, is presented. This complex, which has been previously described as forming dimers in its crystalline form, is also demonstrated as being able to assemble into an infinite AuI···AuI chain polymer. The structural motifs are tenta...
Article
Two different heteropolynuclear AuI–PbII systems were built up through the assembly of different building blocks, [{Au(C6F5)2}{PbCl(terpy)}] and [{Au(C6F5)2}2{Pb(terpy)}]n, which can act as terminal or central pieces, respectively. Computational studies reveals the preference of a specific assembly for these building blocks. Abstract The assembly...
Article
The assembly of two different building blocks, [{Au(C6F5)2}{PbCl(terpy)}] (terpy=2,2′:6′:2′′‐terpyridine) and [{Au(C6F5)2}2{Pb(terpy)}]n, acting as terminal or central pieces, respectively, gives rise to a decanuclear complex built via metallophilic and π‐stacking interactions in which the number of AuI⋅⋅⋅AuI and AuI⋅⋅⋅PbII contacts is finely contr...
Article
We report the synthesis of novel perhalophenyl three-coordinated gold(I) complexes using 1,2-bis(diphenylphosphino)benzene (dppBz) as the chelating ligand and [AuR(tht)] (R = C6F5, C6Cl2F3, C6Cl5) as the perhalophenyl–gold(I) source, leading to [AuR(dppBz)] (R = C6F5 (1), C6Cl2F3 (2), C6Cl5 (3)) complexes. The solid-state structures of compounds 2...
Article
Full-text available
Plasmonic gold colloidosomes (Au CSs) of sub-200 nm size are formed by the self-assembly of spherical gold nanoparticles (Au NPs) of ca. 4 nm size at the interface of oleic acid (OA) nanodroplets formed in n -hexane.
Article
1,4,7-Triazacyclononane (TACN) has been used for the first time to support Au(I)⋯M [M = Tl(I), Ag(I)] metallophilic interactions in the formation of heteronuclear gold(I) complexes having luminescence properties. The compounds {[{Au(C6Cl5)2}Tl(TACN)]2}n (1), [{Au(C6F5)2}Tl(TACN)] (2), [{Au(C6Cl5)2}Ag(TACN)] (3), and [{Au(C6F5)2}{Ag(TACN)}2Au(C6F5)2...
Article
The reaction of 4'-(2-thienyl)-2,2':6',2,2''-terpyridine (S-terpy) with the heterometallic complexes [Au2Ag2R4(OEt2)2] n (R = C6F5, C6Cl5) leads to the compounds [{Au(C6X5)2}Ag(S-terpy)] n (X = F (1), Cl (2)). The X-ray diffraction analysis of the complexes shows an alternating disposition of the metals -Au-Ag-Au-Ag- in 1D infinite polymeric chains...
Article
Four silver-based coordination polymers {[Ag(L)2](BF4)}∞ (1), {[Ag(H2BTC)(L)]×(H3BTC)}∞ (2), {[Ag2(H2BTEC)(L)2] × 3.33H2O }∞ (3) and [Ag(H25SSA)(L)]∞ (4) were synthesized using thiomorpholine-4-carbonitrile (L) as the primary ligand and three aromatic polyoxoacids as co-ligands: trimesic (H3BTC), pyromellitic (H4BTEC) and 5-sulfosalicylic acid (H35...
Article
The photocatalytic degradation of the antibiotic ciprofloxacin in water was carried out with nanosheets of graphitic carbon nitride (g-C3N4) as catalyst and visible light irradiation using low-power (4 × 10 W) white light LEDs. The aim of this study was to identify the intermediate by-products formed during the degradation and to propose a pathway...
Article
Reaction of the heterometallic complex [{Au(C6F5)2}Tl] n with the quinoline pendant arm derivatives L 1 and L 2 of the mixed donor macrocycles [12]aneNS2O and PhenNS2 affords the new Au(I)/Tl(I) complexes [{Au(C6F5)2}Tl(L 1 )] (1), [{Au(C6F5)2}Tl(L 2 )] (2), [{Au(C6F5)2Tl}{Au(C6F5)2Tl(L 1 )}]2 (3), and [{Au(C6F5)2Tl}{Au(C6F5)2Tl(L 2 )}] n (4) depen...
Article
Reaction of perhalophenylgold(I) complexes [AuR(tht)] (R = C6Cl2F3, C6Cl5; tht = tetrahydrothiophene) with different number of equivalents of Xantphos (4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene) leads to discrete complexes in which the metal atom displays very different coordination environments. Thus, the ionic complex [Au(Xantphos)2][Au(C6C...
Article
Catalysis under harsh environmental conditions requires robust nanoparticles that can resist leaching of the organic shell and possess significant resistance to aggregation. Robust gold core-carbon shell gold-aryl nanoparticles (AuNPs-COOH) were fabricated by the mild reduction of the water-soluble aryldiazonium salt [HOOC-4-C6H4N≡N]AuCl4, and were...
Article
The ionic complex [Au(9N-adenine)(PMe3)](CF3CO2) (1) displays a supramolecular structure built-up through ionic, π-stacking, C-H···O, C-H···N and C-H···Au interactions. Ab initio calculations permit the characterization of the nature of these interactions. Complex 1 is luminescent in solid state at 77 K. This complex forms a hydrometallogel consist...
Article
A temperature controlled self-assembly process in solution of [Ag(terpy)]nn+ and [Au(C6F5)2]- units has been performed. For this, the crystallisation of complex [{AuR2}Ag(terpy)]n in the same experimental conditions, only changing the temperature, permits the synthesis of polymorphs [{Au(C6F5)2}2Ag2(terpy)2]n (2a) at 298 K and [{Au(C6F5)2}Ag(terpy)...
Article
In this paper, we describe experimental evidence of a change in the emission energy as a function of the Au-Au distance. We have employed a luminescent complex exhibiting an aurophilic interaction, which is weak enough to allow its length to be modified by external pressure but rigid enough to confer structural stability on the complex. By determin...
Article
Reaction of the heterometallic polymer [Au2Ag2(C6Cl5)4(OEt2)2]n with 4 equiv of pyridazine leads to the new discrete complex [Au2Ag2(C6Cl5)4(μ2-C4H4N2)2(C4H4N2)2] (1). Complex 1 is solvoluminescent, leading to drastic structural changes, depending on the coordination ability of the chosen solvent. Thus, the reaction of complex 1 with acetonitrile l...
Article
The photocatalytic degradation of ibuprofen with TiO2 nanoparticles (NPs) and UV light and with graphitic carbon nitride (g-C3N4) 2D nanosheets and visible light are proposed and compared as advanced oxidation treatments for the removal of ibuprofen in water. By-products formed with both photocatalytic systems have been tentatively identified based...
Article
An unprecedented polymeric Ag‐Au‐Tl system built up by unsupported intermetallic interactions, by reaction between two heterobimetallic Au−Ag and Au−Tl complexes is reported in this work and depicted in the cover image. Computational studies show that the combination of dispersive forces and a very large dipole moment favors the formation of this l...
Article
We report the synthesis of aryldiazonium tetrachloroaurate(III) salts [X-4-C6H4N≡N]AuCl4 (X = F, Cl, Br, I, CN, NO2) and their mild reduction to covalently functionalized nanoparticles. The synthesis of the salts was carried out by the oxidation of anilines, dissolved in HCl, using sodium nitrite followed by the exchange of the counter anion with [...
Article
The reactivity of the polymeric gold(I)/silver(I) compound [Au2Ag2(C6F5)4(OEt2)2] n toward the 12-membered mixed-donor macrocyclic ligands 1,7-diaza-4,10-dithiacyclododecane (L1), 1-aza-4,7,10-trithiacyclododecane (L2), N-quinolinylmethyl-1-aza-4,7,10-trithiacyclododecane (L3), and N, N'-bis(quinolinylmethyl)-1,7-diaza-4,10-dithiacyclododecane (L4)...
Article
The crystal structure of the polymeric complex [Au5Ag2Tl3(C6F5)10(L1)2]n 3 (L1 = 1‐aza‐4,10‐dithia‐7‐oxacyclododecane) displays heterotrimetallic AgAuTl moieties and is held by unsupported metallophilic interactions. This complex emits at 500 nm in solid state. Ab initio calculations show that the large thermodynamic stability that helps the format...
Article
Two water-soluble [Au(9N-adeninate)(PR3)] complexes (PR3= PMe3(1); PTA (3)) were synthesized by the coordination of the respective cationic [Au(PR3)]+fragment to the9N position of the adeninate anion. Both complexes crystallize as dimers by aurophilic contacts of 3.2081(6) Å in 1 and 3.0942(7) and 3.0969(7) Å in 3, but different packings are observ...
Article
Following an acid–base strategy, based on the reaction between gold(I) basic fragments and acid silver salts, it is possible to obtain heterometallic polymers of the general formula [Au2Ag2(R)4(L)2]n (R = C6Cl2F3; L = pyrimidine). Using this new heterometallic complex [Au2Ag2(C6Cl2F3)4(pym)2]n (1) as a starting material, and a good coordinating sol...
Article
The structure of the complex [{Pb(HBpz3)}{Au3(o-C6BrF4)3(HBpz3)}] consists of a host–guest heterometallic system built up through a plethora of interactions including electrostatic, metallophilic, H-bonding, Au⋯Br or weak C⋯C or Pb⋯Br contacts. Computational studies show that the dispersive interactions are responsible for the attraction of the Pb(...
Article
Full-text available
The development of gold catalysis has allowed significant levels of activity and complexity in organic synthesis. Recently, the use of very active small gold subnanoclusters (Aun, n < 10) has been reported. The stabilization of such nanocatalysts to prevent self-aggregation represents a true challenge that has been partially remediated, for instanc...
Article
Reaction of the heterometallic complexes [{Au(C6X5)2}Tl]n (X = Cl, F) with equimolecular amounts of the N,S-mixed-donor crown ethers [12]aneNS3 or [12]aneN2S2 affords the new Au(I)/Tl(I) derivatives [{Au(C6Cl5)2}{Tl(L)}2][Au(C6Cl5)2] [L = [12]aneNS3 (1), [12]aneN2S2 (2)], [{Au(C6F5)2}Tl([12]aneNS3)]2 (3), or [{Au(C6F5)2}Tl([12]aneN2S2)]n (4). These...
Article
Full-text available
The structure of a new lamellar gold thiolate coordination polymer is described. [Au(+I)( p -SPhCO 2 H)] n exhibits unique bent S-Au-S angles due to the presence of both aurophilic and hydrogen interactions. More interestingly,...
Article
The reaction of the polymers [Au2Cu2(C6X5)4(NCMe)2]n (X = Cl (1), F (2)) with the aromatic N-donor ligand pyridazine in different molar ratios gives rise to new Au(I)/Cu(I) heterometallic complexes [AuCu(C6Cl5)2(μ2-C4H4N2)(NCMe)]2 (3), [AuCu(C6X5)2(μ2-C4H4N2)(C4H4N2)]2 (X = Cl (4), X = F (6)) and [Cu2(μ2-C4H4N2)3(NCMe)2][Au(C6F5)2]2 (5). In all cas...
Article
A novel and efficient strategy for the synthesis of luminescent polymers bearing metallophilic interactions with unprecedented charge sequences has been designed. For this end suitable basic gold units such as [AuR2](-), bearing perhalophenyl derivatives, and dinuclear acid silver terpyridine species, [Ag2(terpy)2](CF3SO3)2, have been chosen. Their...
Article
Among the coinage metal complexes displaying luminescent properties, those bearing C-donor aryl ligands have an increasing part in the chemistry of these metals. These types of ligands confer a high kinetic and thermodynamic stability on the complexes, but they can also be involved in the photoluminescent behaviour of the complexes. The development...
Article
In this paper the reaction products of the basic gold(I) species [Au(C6Cl5)2](-) against the acid salt Ag(OClO3) in the presence of the S-donor macrocyclic ligand 1,4,7-trithiacyclononane ([9]aneS3) are studied in different solvents. Two different isomers of stoichiometry [{Au(C6Cl5)2}Ag([9]aneS3)]2 were isolated depending on the solvent used, dich...
Article
Reaction of [Au2Ag2R4(Et2O)2] (R = C6Cl2F3⁻ or C6F5⁻) with [Pb{HB(pz)3}]Cl in a 1:2 molar ratio led to complexes [AuPb{HB(pz)3}R2] (R = C6Cl2F3⁻ (2) or C6F5⁻ (3)) through transmetalation reactions. The crystal structures of these complexes display unsupported Au(I)···Pb(II) interactions of 3.0954(4) (2) and 3.2778(4) (3) Å, together with one (2) or...
Article
The reactivity of benzimidazol-2-ylidenes with respect to gold nanoparticles (AuNPs) has been investigated using a combined experimental and computational approach. First, the grafting of benzimidazol-2-ylidenes bearing benzyl groups on the nitrogen atoms is described, and comparisons are made with structurally similar N-heterocyclic carbenes (NHCs...
Article
The purpose of this work is to shed light on the reactivity of benzimidazol-2-ylidenes with respect to gold nanoparticles (AuNPs), using a combined experimental/computational approach. First, the grafting of benzimidazol-2-ylidenes bearing benzyl groups on the nitrogen atoms is described, and comparisons are made with structurally similar N-heteroc...
Article
The preparation of homoleptic heterometallic complexes still remains a challenge. Herein, we report the synthesis and characterization of [Au(PMe3)2][{AuHg2(o-C6F4)3}{Hg3(o-C6F4)3}] (), a gold-mercury homoleptic metallacycle. The crystal structure of displays two [Hg2M(o-C6F4)3] (M = Au(I), Hg(II)) units linked through a short AuHg contact of 3.097...
Article
The first structure elucidation of a lamellar gold thiolate coordination polymer is described. [Au(p-SPhCO2Me)]n is obtained from the simultaneous esterification of mercaptobenzoic acid and reduction of the Au(iii) precursor. Despite the presence of aurophilic interactions, the intense phosphorescence (QY ∼ 70%) originates from intra-ligand and met...
Article
Full-text available
Different [AuL]+ fragments (L = tertiary phosphines, ylides, or NHC carbene) have been tested under mild conditions as suitable catalysts for the transformation of terminal or internal alkynes into the corresponding cyclic acetals upon reaction with ethylene glycol. We have obtained a moderate to negligible activity when using tertiary phosphines o...
Chapter
Nanotechnology is having an impact in several areas of the food industry, including winemaking. The main objective of this chapter was to carefully address the need of winemakers and enologists regarding the current knowledge and perspectives of nanomaterials and nanobiosensors that will have an impact on the raw material and the wine manufacturing...
Article
Invited for this month's cover are collaborators from the group of José M. López-de-Luzuriaga at Universidad de la Rioja, Spain and researchers from University of Helsinki, Finland. The cover picture shows a photograph of a gold-germanium complex that has two emission modes corresponding to two independent triplet excited states. Read the full text...
Article
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In the search for new substitutes to the use of sulfur dioxide (SO2) in oenology, a new line of research based on nanotechnology has been launched. Within this line, this paper evaluates the suitability of two new biocompatible silver nanoparticles (Ag-NPs) to control microbial growth in wine as well as their stability and potential risks at intest...
Article
Reaction of [Au(C6F5)(tht)] (tht = tetrahydrothiophene) with 2,2':6',2″-terpyridine (terpy) leads to complex [Au(C6F5)(η(1)-terpy)] (1). The chemical oxidation of complex (1) with 2 equiv of [N(C6H4Br-4)3](PF6) or using electrosynthetic techniques affords the Au(III) complex [Au(C6F5)(η(3)-terpy)](PF6)2 (2). The X-ray diffraction study of complex 2...
Article
Full-text available
Ultrathin Au-Ag alloy nanorods and nanowires of different lengths and ca. 1.9 nm diameter are prepared through a low-temperature decomposition of the precursor [Au2Ag2(C6F5)4(OEt2)2]n in oleic acid. This nanostructure formation has been studied through TEM, HRTEM, EDS, HS-SPME-GC-MS and (19)F NMR spectroscopy. The UNRs and UNWs display a length-dep...
Article
The synthesis of tetrahedral Au(I) complexes [Au(GeCl3)L3] (L = PMe3 (1), PMe2Ph (2), PMePh2 (3), PPh3 (4)) was carried out by in situ treatment of the [Au(GeCl3)(tht)] complex with three equivalents of the corresponding tertiary phosphine. The crystal structures of complexes 1 and 3 have been determined through X-ray diffraction studies showing [G...
Article
Heteronuclear complexes [HgM(o-C6H4PPh2)2]X (M = Au, X = ClO4 (1); M = Ag, X = BF4 (2); M = Ag, X = CF3CO2 (3); M = Cu, X = Br (4)) were prepared by the treatment of [Hg(o-C6H4PPh2)2] with one equivalent of the corresponding coinage metal salt. Their crystal structures, determined by X-ray diffraction methods, display HgII···MI (M = Au, Ag, Cu) con...
Article
The reactions of 4(dimethylamino)pyridine (DMAP) with the gold(i) precursors [AuR(tht)] (R = C6F5, C6Cl2F3 or C6Cl5; tht = tetrahydrothiophene) lead to complexes [AuR(DMAP)] (R = C6F5 (), C6Cl2F3 () or C6Cl5 ()). X-ray diffraction studies of the complexes reveal the presence of discrete molecules in which aurophilic contacts are absent, with π-stac...
Article
Two different theoretical approaches have been used for the description of the experimentally observed dual luminescence of 4-(dimethylamino)pyridine (DMAP), introducing solvent effects with the polarizable continuum model (PCM), which seems needed to represent the dual fluorescence in polar media. These approaches are the linear response time-depe...
Article
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A gold(i)-thiophenolate coordination polymer, [Au(SPh)]n, has been synthesized by employing hydrothermal conditions at 120 [degree]C. This new synthesis led to isolate highly crystalline compound and to solve its structure from powder X-ray diffraction patterns. The compound forms double interpenetrated helical chains stabilized through C-H[small p...
Article
This paper reports the inhibitory potential of two new silver-based biocompatible nanoparticles (Ag NPs), specifically synthesized for this study, against Gram-negative and Gram-positive bacteria, such as Escherichia coli and Staphylococcus aureus, and different wine lactic acid bacteria (LAB) (Oenococcus oeni, Lactobacillus casei, Lactobacillus pl...
Article
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The heteronuclear Au I /Hg II complex [AuHg(o-C6H4PPh2)2I] (1) was prepared by reacting of [Hg(2-C6H4PPh2)2] with [Au(tht)2]ClO4 (1:1) and NaI in excess. The heterometallic compound 1 has been structurally characterized and shows an unusual blue luminescent emission in the solid state. Theoretical calculations suggest that that the origin of the em...
Article
The effect of N and Fe doping on the structural, optical, photocatalytic and magnetic properties of TiO2 nanoparticles is analyzed. Undoped, N and Fe doped TiO2 nanoparticles were synthesized by sol-gel method. Titanium tetraisopropoxide (TTIP) was used as the alkoxyde precursor and iron (III) nitrate and urea were the employed precursors to obtain...
Article
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The reaction of 1,4-bis(2'-pyridylethynyl)benzene (L) with [{Au(C6X5)2}Tl]n affords new heterometallic Au(I)/Tl(I) complexes with different stoichiometries, structural arrangements and optical properties depending on the halogens present in the aryl group. The chlorinated derivative [{Au(C6Cl5)2}Tl(L)]n () displays polymeric chains built thanks to...
Article
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The crystal structure of complex [Pb{HB(pz)(3)}Au(C6Cl5)(2)] 1 displays an unsupported Au(I)center dot center dot center dot Pb(II) interaction. This complex emits at 480 nm in the solid state due to an aurate(I) to lead(II) charge transfer, in which the existence of a metallophilic interaction is a pre-requisite. Ab initio calculations show a very...
Article
Magnetically separable photocatalysts composed of Fe3O4@SiO2 nanoparticles coated with nitrogen-doped TiO2(Fe3O4/SiO2/N-TiO2) are analyzed in this paper. First, Fe3O4@SiO2 nanoparticles were synthesized using an autocombustion sol-gel method, with ferric nitrate and tetraethyl orthosilicate (approximately 23 wt% of SiO2). In the second step, once t...
Article
In this work, room-temperature ferromagnetism and the red-shift of the optical absorption is analyzed in nitrogen doped TiO2 semiconductor nanoparticles. The nanoparticles were synthesized by the sal-gel method using urea as the nitrogen source. Titanium Tetraisopropoxide (TTIP) was employed as the alkoxyde precursor and dissolved in ethanol. The a...
Article
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Reactions between [Au(C6Cl2F3)(tht)] and P,N-donor bridging ligands of the type PPh2py and (PPh2)2phen lead to the homonuclear gold complexes [Au(C6Cl2F3)(PPh2py)] () and [Au2(C6Cl2F3)2{(PPh2)2phen}] (). Subsequent addition of [Cu(CH3CN)4](BF4) leads to the formation of the corresponding gold-copper heterometallic complexes [Au2Cu(C6Cl2F3)2(PPh2py)...
Article
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Ultrasmall gold nanoparticles (Au UNPs) represent a unique class of nanomaterials making them very attractive for certain applications. Herein, we developed an organometallic approach to the synthesis of Au UNPs stabilized with the C18H37-NHC ligand by the solvent free thermolysis of [RMIM][Au(C6F5)2] (1) or [Au(C6F5)(RNHC)] (3) (with R = C18H37-),...
Article
Reaction of [{Au(C6X5)2}Ag]n (X = Cl, F) with the crown thioethers 1,4,7-trithiacyclononane ([9]aneS3), 1,4,8,11-tetrathiacyclotetradecane ([14]aneS4), or 1,4,7,10,13,16,19,22-octathiacyclotetracosane ([24]aneS8) affords a series of heteronuclear Au(I)/Ag(I) compounds of stoichiometry [{Au(C6X5)2}Ag(L)x] (L = [9]aneS3, x = 2 (1, 4); L = [14]aneS4,...
Article
The properties of different Au(111) halo dithiocarbamate complexes of structure [AuX2(S2CN(R)(2))] as suitable catalysts for the hydration reaction of phenylacetylene have been tested. Moderate catalytic activity was found for X = Cl, Br, while those compounds in which X = I, C6F5 are inert. A working mechanism involving the initial dissociation of...
Article
Ag–Au core–shell nanoprisms were obtained through the deposition of Au atoms over hexadecylamine-stabilized Ag nanoparticles through the mild decomposition of an organometallic AuI precursor. The effects of the amount of precursor [Au(C6F5)(tht)] (tht = tetrahydrothiophene) added and the reaction time on the size, shape, and composition of the core...
Article
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Monodisperse Au–Ag alloy nanoparticles of different compositions are prepared through the mild decomposition of the bimetallic precursor [Au2Ag2(C6F5)4(OEt2)2]n in an organic solvent using hexadecylamine (HDA) as a stabilizing ligand. The effects of different reaction parameters on the size and composition of the nanoparticles, such as the metal:HD...