Edwin A. Baquero

• M.Sc. PhD
• Professor (Associate) at National University of Colombia

The development of bimetallic nanomaterials with precisely controlled size, shape, and composition has emerged as a cornerstone of sustainable catalysis, offering innovative solutions for chemical valorization processes. In this work, CoPd bimetallic nanoparticles were prepared via an organometallic approach using Co[N(SiMe3)2]2(thf) and Pd(acac)2...

En este trabajo se presenta el primer estudio de la caracterización de los cambios didácticos en la práctica docente de un profesor universitario de química organometálica, en relación con la inclusión de la naturaleza de la ciencia en su quehacer educativo y su conocimiento didáctico del contenido. Para ello, se adoptó un enfoque multiparadigmátic...

CO2 hydrogenation into value-added chemicals such as formic acid, formaldehyde, and methanol is a critical process in pursuing the reduction of greenhouse gas emissions and consolidating a low-carbon economy. In this review, we provide a comprehensive overview of the advancements in Ru-based heterogeneous catalysts for these transformations over th...

Bench-stable N-heterocyclic carbene (NHC) precursors are increasingly recognized as practical alternatives to free carbenes, addressing challenges related to air sensitivity and extending their utility in chemical transformations. In this study, we disclose a novel intramolecular C-H insertion of a bulky N-heterocyclic carbene (NHC), IPr#, leading...

Metal nanoparticles (MNPs) functionalized with hydrosoluble ligands have emerged as versatile tools in various fields, including catalysis and biomedical applications, among others. This chapter explores recent advances in the synthesis, characterization, and applications of water-soluble MNPs stabilized by diverse ligands. The significance of work...

N‐Heterocyclic carbenes (NHCs) are molecules with exceptional catalytic properties in a wide range of reactions. Recently, there has been a growing interest in using them as catalysts for biomass conversion. In this review, we examine the current state of glycerol valorisation (GV) using several catalytic systems, including metallic complexes beari...

Diversos autores han demostrado que un enfoque histórico de la enseñanza de la química puede ser complementado desde una visión de la filosofía de la ciencia. Esto permite abrir el panorama de comprensión de lo que implica hacer química y abordar así aspectos de esta disciplina como una empresa dinámica en constante cambio y evolución. En tal senti...

In recent years, N-heterocyclic carbenes (NHC) have gained recognition as versatile molecules capable of acting as organocatalysts in various reactions, particularly through the activation of aldehydes via Breslow-type adducts. This organocatalytic activation has enabled the production of numerous 3,4-dihydropyran-2-ones and related derivatives. In...

Labelling of amino-acids is important for the production of deuterated proteins. However, aromatic amino-acids reduction is a common undesired process with noble-metal nanocatalysts. In this work, we describe a new...

Modern synthetic chemistry has explored the applicability of more abundant and less toxic transition metals based on their reactivity towards C-H functionalization reactions despite their lower catalytic performance compared to noble-metal catalysis. However, a strong understanding of the reaction mechanism is required to make a rational design of...

Suppressing aromatic ring reduction in noble-metal-catalyzed H/D exchange reactions remains a challenge. This drawback may be overcome by finding a synergetic effect in bimetallic nanoparticles (NPs). Herein, we report the synthesis of bimetallic lipo- and water-soluble Ru/Ir NPs. They were characterized by state-of-the-art techniques such as trans...

The production of water-soluble and stable metallic nanoparticles that can act as recoverable catalysts still remains a challenge. Herein we report the behavior of a series of water-soluble platinum nanoparticles containing different sulfonated NHC ligands as recoverable catalysts for the hydrogenation of aromatic compounds in pure water. The NHC-p...

The formation of complex nanostructures combining quantum dots (QDs) and metallic nanoparticles (NPs) opens new perspectives to study and control energy transfer between them, provided that all the phenomena (reabsorption, screening and quenching effect) potentially affecting the photoluminescence (PL) of QDs could be identified and differentiated....

The preparation of trans-[Pt(dmso)2ClMe] (2) and cis-[Pt(dmso)2Me2] (3) from cis-[Pt(dmso)2Cl2] (1) and SnMe4 has been reexamined (dmso = dimethyl sulfoxide). The information obtained from experimental and DFT studies has permitted the improvement of previously reported methods for the synthesis of both complexes in terms of reaction times, reactio...

Bimetalllic ruthenium-platinum nanoparticles (RuPt NPs) of different surface distributions and stabilized by a sulfonated N-heterocyclic carbene ligand (1-(2,6-diisopropylphenyl)-3-(3-potassium sulfonatopropyl)-imidazol-2-ylidene) were prepared from Ru(COD)(COT) (COD = cyclooctadiene and COT = cyclooctatriene), and platinum precursors displaying va...

During the last ten years, base metals have become very attractive to the organometallic and catalytic community on activation of C-H bonds for their catalytic functionalization. In contrast to the statement that base metals differ on their mode of action most of the manuscripts mistakenly rely on well-studied mechanisms for precious metals while p...

Indium phosphide colloidal quantum dots are emerging as an efficient cadmium-free alternative for opto-electronic applications. Recently, syntheses based on easy-to-implement aminophosphine precursors have been developed. We show by solid-state nuclear magnetic resonance spectroscopy that this new approach allows oxide-free indium phosphide core or...

The synthesis of metal nanoparticles (NPs) under controlled conditions in water remains a challenge in nanochemistry. Two different approaches to obtain platinum NPs, which involve the treatment of aqueous solutions of preformed sulfonated (NHC)Pt(II) dimethyl complexes with carbon monoxide, and of (NHC)Pt(0) diolefin complexes with dihydrogen (NHC...

Control over particle surfaces and interfaces is a principal requirement to fully take advantage of semiconducting Quantum Dot (QDs) properties. In the case of indium phosphide, the sensitivity of the material to water renders it challenging to synthesize oxide-free particles. We demonstrate the ability to achieve complete control over the surface...

Oxidative addition of CH3I and alkynes to the platinum(0) complex [Pt(AE)NHC] (1), in which the NHC ligand is a sulfonated version of the IPr ligand (1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) and AE is diallyl ether, is reported. Reaction with the haloalkane affords the iodomethyl complex [PtI(Me)NHC] (2), whereas the addition of alkynes vi...

Gold nanowires with a mean diameter of 1.7 nm were synthesized by reduction of HAuCl4 in a solution of oleylamine (OY) in hexane. A bilayer of oleylammonium chloride/oleylamine at the surface of the raw nanowires was evidenced by NMR and DOSY experiments. After washing a monolayer of oleylammonium chloride remained at the surface of the nanowires....

Thanks to new water-soluble Ru nanoparticles (NPs) stabilized by sulfonated NHC ligands, we demonstrate that it is possible to monitor the catalyst/substrate interaction using NMR chemical shift perturbations (CSPs), under conditions that closely resemble those applied during the enantiospecific C–H deuteration of L-lysine. Correlating the pH depen...

Ligand control of metal nanoparticles (MNPs) is rapidly gaining importance as ligands can stabilize the MNPs and regulate their catalytic properties. Herein we report the first example of Pt NPs ligated by imidazolium-amidinate ligands that bind strongly through the amidinate anion to the platinum surface atoms. The binding was established by¹⁵N NM...

A detailed knowledge of surface chemistry is necessary to bridge the gap between nanocrystal synthesis and applications. Although it has been proposed that carboxylic acids bind to metal oxides in a dissociative NC(X)2 binding motif, this surface chemistry was inferred from indirect evidence on HfO2 nanocrystals (NCs). Here, a more detailed picture...

The control and understanding of the chemical and physical properties of quantum dots (QDs) demands detailed surface characterization. However, probing the immediate interface between the inorganic core and the ligands is still a major challenge. Here we show that using cross-polarization magic angle spinning (MAS) NMR, unprecedented information ca...

A series of water-soluble (NHC)Pt(0)(dvtms) and (NHC)Pt(0)(AE) complexes containing different sulfonated NHC ligands (dvtms = divinyltetramethyldisiloxane and AE = diallyl ether) are reported. The dvtms compounds have been found to be quite robust and to display some conformational rigidity, whereas their AE counterparts are less stable and more fl...

A family of water-soluble dimethyl complexes of formula cis-[PtMe2(dmso)(NHC center dot Na)] (2), in which NHC is an anionic N-heterocyclic carbene bearing a sulfonatopropyl chain on one of the nitrogen atoms and a sulfonatopropyl (a), methyl (b), mesityl (c), or 2,6-diisopropylphenyl group (d) on the other, have been prepared. The hydrolytic stabi...

Controlling the synthesis of stable metal nanoparticles in water is a current challenge in nanochemistry. The strategy presented herein uses sulfonated N-heterocyclic carbene (NHC) ligands to stabilize platinum nanoparticles (PtNPs) in water, under air, for an indefinite time period. The particles were prepared by thermal decomposition of a preform...

Controlling the synthesis of stable metal nanoparticles in water is a current challenge in nanochemistry. The strategy presented herein uses sulfonated N-heterocyclic carbene (NHC) ligands to stabilize platinum nanoparticles (PtNPs) in water, under air, for an indefinite time period. The particles were prepared by thermal decomposition of a preform...

This report describes the synthesis of water-soluble silver(I) and platinum(II) complexes bearing sulfonated mono- or dianionic N-heterocyclic carbene ligands. Thus, treatment of the corresponding zwitterionic imidazolium derivative with silver(I) oxide in water afforded the light-sensitive bis(carbene) complexes Ag[Ag(NHC)2] (2Ag+), which were tra...

The larvicidal potential of several dopamine 1-phenylisoquinoline derivatives against Culex quinquefasciatus third instar larvae was investigated in a rational search for insecticides. The results showed that these isoquinolines presented moderate larvicidal activity, that the presence of a substituent is needed on carbon 1 for such activity to be...

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Regioselectivity in isoquinoline alkaloid synthesis is analyzed here. Our experiments have shown that substituents on the aromatic ring of the starting amine are determinant in isoquinoline synthesis. The use of dicyclohexylcarbodiimide in activating carboxylic acids for electrophilic aromatic substitution reactions is presented for the first time.

In the present article results of the evaluation of the pozzolanic activity of fluid catalytic cracking residue (FCC) proceeding from the petrol industry, are presented. Possibility of FCC as an addition to cement for the production concrete and mortars was studied. The pozzolanic activity of the FCC was evaluated according to ASTM C311 and C618, t...

En el presente artículo se presentan los resultados de la evaluación de la actividad puzolánica del catalizador gastado de craqueo catalítico (FCC), procedente de la industria del petróleo; con el fin de explorar la posibilidad de utilizar este desecho industrial como adición al cemento para la producción de concretos y morteros. La actividad puzol...