1
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Patel A, Patel J, Pathan S. Highly Active and Dispersed Pd Nanoparticles Stabilized by Lacunary Phosphomolybdate: Synthesis, Characterization, and Liquid Phase Hydrogenation of Levulinic Acid to γ-Valerolactone. Inorg Chem 2023; 62:6970-6980. [PMID: 37104732 DOI: 10.1021/acs.inorgchem.3c00205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
In the current scenario, one of the crucial reaction conversions is the synthesis of renewable biofuels and value-added chemicals from the hydrogenation of biomass. Therefore, in the present work, we are proposing aqueous phase conversion of levulinic acid to γ-valerolactone via hydrogenation using formic acid as a sustainable green hydrogen source over a sustainable heterogeneous catalyst. The catalyst based on Pd nanoparticles stabilized by lacunary phosphomolybdate (PMo11Pd) was designed for the same and characterized by EDX, FT-IR, 31P NMR, powder XRD, XPS, TEM, HRTEM, and HAADF-STEM analyses. A detailed optimization study was done to achieve maximum conversion (95% conversion), using a very small amount of Pd (1.879 × 10-3 mmol) with notable TON (2585) at 200 °C in 6 h. The regenerated catalyst was found to be workable (reusable) up to three cycles without any change in activity. Also, a plausible reaction mechanism was proposed. The catalyst exhibits superior activity against reported catalysts.
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Affiliation(s)
- Anjali Patel
- Polyoxometalates and Catalysis Laboratory, Department of Chemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara 39002, Gujarat, India
| | - Jay Patel
- Polyoxometalates and Catalysis Laboratory, Department of Chemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara 39002, Gujarat, India
| | - Soyeb Pathan
- Centre of Research for Development (CR4D), Parul Institute of Applied Sciences, Parul University, Vadodara 391760, India
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2
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Zhang Q, He C, Huo J. Epoxidation of O2 and C3H6 on M1/PTA Single-Atom Catalyst: Theory and Calculation Simulations. Catal Letters 2023. [DOI: 10.1007/s10562-023-04290-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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3
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Rajan A, Elcheikh Mahmoud M, Wang F, Bhattacharya S, Mougharbel AS, Ma X, Müller AB, Nisar T, Taffa DH, Poblet JM, Kuhnert N, Wagner V, Wark M, Kortz U. Discovery of Polythioplatinate(II) [Pt 3S 2(SO 3) 6] 10- and Study of Its Solution and Catalytic Properties. Inorg Chem 2022; 61:11529-11538. [PMID: 35866749 DOI: 10.1021/acs.inorgchem.2c00777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have discovered the first polythioplatinate(II), [PtII3S2(SO3)6]10- (1), which was synthesized in aqueous basic medium (pH 11) by hydrothermal heating at 150 °C. Polyanion 1 comprises a discrete, triangular assembly of three Pt2+ ions linked by two μ3-sulfido ligands, and their square-planar coordination geometry is completed by two terminal S-bound sulfito ligands. Polyanion 1 was isolated as a hydrated sodium salt, Na10[PtII3(μ3-S)2(SO3)6]·22H2O (Na-1), which was characterized in the solid state by single-crystal X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectra, and elemental analysis, in solution by 195Pt NMR and atomic absorption spectroscopy, and in the gas phase by electrospray ionization mass spectrometry. Density functional theory calculations were performed, and the 195Pt NMR chemical shifts of 1 were computed theoretically and shown to match well with the experimental data. Furthermore, the discrete title polyanion 1 was immobilized on mesoporous SBA-15 support and used as a precatalyst for the hydrogenation of o-xylene.
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Affiliation(s)
- Ananthu Rajan
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Mahmoud Elcheikh Mahmoud
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Fei Wang
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo 1, 43007 Tarragona, Spain
| | - Saurav Bhattacharya
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Ali S Mougharbel
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Xiang Ma
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Anja B Müller
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Talha Nisar
- Department of Physics and Earth Sciences, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Dereje H Taffa
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany
| | - Josep M Poblet
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo 1, 43007 Tarragona, Spain
| | - Nikolai Kuhnert
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Veit Wagner
- Department of Physics and Earth Sciences, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Michael Wark
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany
| | - Ulrich Kortz
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
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4
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Stabilized catalyst comprising nickel and supported 12-tungstophosphoric acid: synthesis, characterization and aqueous-phase Suzuki–Miyaura cross-coupling. TRANSIT METAL CHEM 2022. [DOI: 10.1007/s11243-022-00507-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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5
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Bhattacharya S, Ma X, Mougharbel AS, Haouas M, Su P, Espenship MF, Taffa DH, Jaensch H, Bons AJ, Stuerzer T, Wark M, Laskin J, Cadot E, Kortz U. Discovery of a Neutral 40-Pd II-Oxo Molecular Disk, [Pd 40O 24(OH) 16{(CH 3) 2AsO 2} 16]: Synthesis, Structural Characterization, and Catalytic Studies. Inorg Chem 2021; 60:17339-17347. [PMID: 34705452 DOI: 10.1021/acs.inorgchem.1c02749] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report on the synthesis and structural characterization of a giant, discrete, and neutral molecular disk, [Pd40O24(OH)16{(CH3)2AsO2}16] (Pd40), comprising a 40-palladium-oxo core that is capped by 16 dimethylarsinate moieties, resulting in a palladium-oxo cluster (POC) with a diameter of ∼2 nm. Pd40, which is the largest known neutral Pd-based oxo cluster, can be isolated either as a discrete species or constituting a 3D H-bonded organic-inorganic framework (HOIF) with a 12-tungstate Keggin ion, [SiW12O40]4- or [GeW12O40]4-. 1H and 13C NMR as well as 1H-DOSY NMR studies indicate that Pd40 is stable in aqueous solution, which is also confirmed by ESI-MS studies. Pd40 was also immobilized on a mesoporous support (SBA15) followed by the generation of size-controlled Pd nanoparticles (diameter ∼2-6 nm, as based on HR-TEM), leading to an effective heterogeneous hydrogenation catalyst for the transformation of various arenes to saturated carbocycles.
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Affiliation(s)
- Saurav Bhattacharya
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Xiang Ma
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Ali S Mougharbel
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Mohamed Haouas
- Institut Lavoisier de Versailles, UMR 8180 CNRS, UVSQ, Université Paris-Saclay, Versailles 78035, France
| | - Pei Su
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | | | - Dereje H Taffa
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany
| | - Helge Jaensch
- Global Chemical Research, ExxonMobil Chemical Europe Inc., 1831 Machelen, Belgium
| | - Anton-Jan Bons
- Global Chemical Research, ExxonMobil Chemical Europe Inc., 1831 Machelen, Belgium
| | - Tobias Stuerzer
- Bruker AXS GmbH, Oestliche Rheinbrueckenstrasse 49, 76187 Karlsruhe, Germany
| | - Michael Wark
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany
| | - Julia Laskin
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Emmanuel Cadot
- Institut Lavoisier de Versailles, UMR 8180 CNRS, UVSQ, Université Paris-Saclay, Versailles 78035, France
| | - Ulrich Kortz
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
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6
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Patel A, Patel A. Designing of Stabilized Palladium Nanoclusters: Characterization, Effect of Support and Acidity on C–C cross coupling. Catal Letters 2021. [DOI: 10.1007/s10562-021-03658-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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7
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Designing of Highly Active and Sustainable Encapsulated Stabilized Palladium Nanoclusters as well as Real Exploitation for Catalytic Hydrogenation in Water. Catal Letters 2021. [DOI: 10.1007/s10562-020-03327-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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8
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Bock N, De Clercq A, Seidl L, Kratky T, Ma T, Günther S, Kortz U, Heiz U, Esch F. Towards Size‐Controlled Deposition of Palladium Nanoparticles from Polyoxometalate Precursors: An Electrochemical Scanning Tunneling Microscopy Study. ChemElectroChem 2021. [DOI: 10.1002/celc.202100131] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Nicolas Bock
- Catalysis Research Center and Chemistry Department Technical University of Munich Lichtenbergstr. 4 85748 Garching Germany
| | - Astrid De Clercq
- Catalysis Research Center and Chemistry Department Technical University of Munich Lichtenbergstr. 4 85748 Garching Germany
| | - Lukas Seidl
- Department Mobility Energy & Environment Swiss Federal Laboratories for Materials Science and Technology Überlandstrasse 129 8600 Dübendorf Switzerland
| | - Tim Kratky
- Catalysis Research Center and Chemistry Department Technical University of Munich Lichtenbergstr. 4 85748 Garching Germany
| | - Tian Ma
- Department of Life Sciences and Chemistry Jacobs University Campus Ring 1 28759 Bremen Germany
| | - Sebastian Günther
- Catalysis Research Center and Chemistry Department Technical University of Munich Lichtenbergstr. 4 85748 Garching Germany
| | - Ulrich Kortz
- Department of Life Sciences and Chemistry Jacobs University Campus Ring 1 28759 Bremen Germany
| | - Ueli Heiz
- Catalysis Research Center and Chemistry Department Technical University of Munich Lichtenbergstr. 4 85748 Garching Germany
| | - Friedrich Esch
- Catalysis Research Center and Chemistry Department Technical University of Munich Lichtenbergstr. 4 85748 Garching Germany
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9
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Patel A, Patel A. Synthesis and characterization of supported stabilized palladium nanoparticles for selective hydrogenation in water at low temperature. RSC Adv 2021; 11:8218-8227. [PMID: 35423350 PMCID: PMC8695083 DOI: 10.1039/d1ra00239b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 02/12/2021] [Indexed: 12/24/2022] Open
Abstract
Zirconia supported vacant phosphotungstate stabilized Pd nanoparticles (Pd-PW11/ZrO2) were prepared using a simple impregnation and post reduction method, characterized and their efficiency for selective C[double bond, length as m-dash]C hydrogenation of unsaturated compounds explored. The establishment of a hydrogenation strategy at low temperature using water as solvent under mild conditions makes the present system environmentally benign and green. The catalyst shows outstanding activity (96% conversion) with just a small amount of Pd(0) (0.0034 mol%) with high substrate/catalyst ratio (29 177/1), TON (28 010) and TOF (14 005 h-1) for cyclohexene (as a model substrate) hydrogenation. The catalyst was recovered by simple centrifugation and reused for up to five catalytic cycles without alteration in its activity. The present catalyst was found to be viable towards different substrates with excellent activity and TON (18 000 to 28 800). A study on the effect of addenda atom shows that the efficiency of the catalyst can be enhanced greatly by increasing the number of counter protons. This challenging strategy would greatly benefit sustainable development in chemistry as it diminishes the use of organic solvents and offers economic and environmental benefits as water is cheap and non-toxic.
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Affiliation(s)
- Anish Patel
- Polyoxometalates and Catalysis Laboratory, Department of Chemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda Vadodara-390002 Gujarat India
| | - Anjali Patel
- Polyoxometalates and Catalysis Laboratory, Department of Chemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda Vadodara-390002 Gujarat India
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10
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Abstract
The last two decades have seen great advancements in fundamental understanding and applications of metallic nanoparticles stabilized by mixed-ligand monolayers. Identifying and controlling the organization of multiple ligands in the nanoparticle monolayer has been studied, and its effect on particle properties has been examined. Mixed-ligand protected particles have shown advantages over monoligand protected particles in fields such as catalysis, self-assembly, imaging, and drug delivery. In this Review, the use of mixed-ligand monolayer protected nanoparticles for sensing applications will be examined. This is the first time this subject is examined as a whole. Mixed-ligand nanoparticle-based sensors are revealed to be divided into four groups, each of which will be discussed. The first group consists of ligands that work cooperatively to improve the sensors' properties. In the second group, multiple ligands are utilized for sensing multiple analytes. The third group combines ligands used for analyte recognition and signal production. In the final group, a sensitive, but unstable, functional ligand is combined with a stabilizing ligand. The Review will conclude by discussing future challenges and potential research directions for this promising subject.
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Affiliation(s)
- Offer Zeiri
- Department of Analytical Chemistry, NRCN, P.O. Box 9001, Beer-Sheva 84190, Israel
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11
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Rajan A, Mougharbel AS, Bhattacharya S, Nisar T, Wagner V, Kortz U. Palladium(II)-Containing Tungstoarsenate(V), [Pd II4(As 2W 15O 56) 2] 16-, and Its Catalytic Properties. Inorg Chem 2020; 59:13042-13049. [PMID: 32869984 DOI: 10.1021/acs.inorgchem.0c01737] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have synthesized and structurally characterized the 4-palladium(II)-containing 30-tungsto-4-arsenate(V), [Pd4(As2W15O56)2]16- (1), which represents the first palladium(II)-containing tungstoarsenate(V). The title polyanion 1 was prepared by a simple one-pot procedure in aqueous medium and characterized by single-crystal X-ray diffraction (XRD), thermogravimetric analysis (TGA), cyclic voltammetry, elemental analysis, and 183W nuclear magnetic resonance (NMR), infrared (IR), and ultraviolet-visible (UV-vis) spectroscopies. Polyanion 1 consists of four Pd2+ ions that are coordinated in a square-planar geometry to two trilacunary [As2W15O56]12- Wells-Dawson fragments resulting in a sandwich-type assembly. Catalytic studies on 1 revealed that it is an efficient catalyst precursor for the Suzuki-Miyaura cross-coupling reactions of various aryl halides in aqueous and nonaqueous media.
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Affiliation(s)
- Ananthu Rajan
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Ali S Mougharbel
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Saurav Bhattacharya
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Talha Nisar
- Department of Physics and Earth Sciences, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Veit Wagner
- Department of Physics and Earth Sciences, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Ulrich Kortz
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
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12
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Selective C=C Hydrogenation of Unsaturated Hydrocarbons in Neat Water Over Stabilized Palladium Nanoparticles Via Supported 12-Tungstophosphoric Acid. Catal Letters 2019. [DOI: 10.1007/s10562-019-02763-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Patel HA, Rawat M, Patel AL, Bedekar AV. Celite-Polyaniline supported palladium catalyst for chemoselective hydrogenation reactions. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4767] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Heta A. Patel
- Department of Chemistry, Faculty of Science, M. S. University of Baroda; Vadodara 390 002 India
| | - Maitreyee Rawat
- Department of Chemistry, Faculty of Science, M. S. University of Baroda; Vadodara 390 002 India
| | - Arun L. Patel
- Department of Chemistry, Faculty of Science, M. S. University of Baroda; Vadodara 390 002 India
| | - Ashutosh V. Bedekar
- Department of Chemistry, Faculty of Science, M. S. University of Baroda; Vadodara 390 002 India
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14
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Stabilized Palladium Nanoparticles: Synthesis, Multi-spectroscopic Characterization and Application for Suzuki–Miyaura Reaction. Catal Letters 2018. [DOI: 10.1007/s10562-018-2559-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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15
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Lin Z, Izarova NV, Mehari FT, Kortz U. Palladium(II) Incorporation in the All-Inorganic Cryptand [As4
W40
O140
]28-
: Synthesis and Structural Characterization of [Pd2
Na2
KAs4
W40
O140
(H2
O)]21-. Z Anorg Allg Chem 2018. [DOI: 10.1002/zaac.201800327] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Zhengguo Lin
- Jacobs University; Campus Ring 1 28759 Bremen Germany
- Key Laboratory of Cluster Science; Ministry of Education of China; Beijing Institute of Technology; 100081 Beijing P. R China
| | - Natalya V. Izarova
- Jacobs University; Campus Ring 1 28759 Bremen Germany
- Peter Grünberg Institute PGI-6; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Fitsumbirhan T. Mehari
- Jacobs University; Campus Ring 1 28759 Bremen Germany
- Klinikum der Universität München (LMU); Campus Großhadern; Marchioninistraße 15 81377 München Germany
| | - Ulrich Kortz
- Jacobs University; Campus Ring 1 28759 Bremen Germany
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16
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Makrygenni O, Secret E, Michel A, Brouri D, Dupuis V, Proust A, Siaugue JM, Villanneau R. Heteropolytungstate-decorated core-shell magnetic nanoparticles: A covalent strategy for polyoxometalate-based hybrid nanomaterials. J Colloid Interface Sci 2018; 514:49-58. [DOI: 10.1016/j.jcis.2017.12.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 11/23/2017] [Accepted: 12/05/2017] [Indexed: 01/15/2023]
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17
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Zhang M, Hao J, Neyman A, Wang Y, Weinstock IA. Influence of Polyoxometalate Protecting Ligands on Catalytic Aerobic Oxidation at the Surfaces of Gold Nanoparticles in Water. Inorg Chem 2016; 56:2400-2408. [DOI: 10.1021/acs.inorgchem.6b02167] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mingfu Zhang
- Key Laboratory of
Colloid and Interface Science of the Education Ministry, Department
of Chemistry and Chemical Engineering, Shandong University, Ji’Nan 250100, P. R. China
| | - Jingcheng Hao
- Key Laboratory of
Colloid and Interface Science of the Education Ministry, Department
of Chemistry and Chemical Engineering, Shandong University, Ji’Nan 250100, P. R. China
| | - Alevtina Neyman
- Department of Chemistry and the Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer Sheva, 84105, Israel
| | - Yifeng Wang
- Key Laboratory of
Colloid and Interface Science of the Education Ministry, Department
of Chemistry and Chemical Engineering, Shandong University, Ji’Nan 250100, P. R. China
| | - Ira A. Weinstock
- Department of Chemistry and the Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer Sheva, 84105, Israel
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18
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Izarova NV, Santiago-Schübel B, Willbold S, Heß V, Kögerler P. Classical/Non-classical Polyoxometalate Hybrids. Chemistry 2016; 22:16052-16056. [PMID: 27617918 PMCID: PMC5095796 DOI: 10.1002/chem.201604238] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Indexed: 11/07/2022]
Abstract
Two polyanions [SeI V2 PdII4 WVI14 O56 H]11- and [SeI V4 PdII4 WVI28 O108 H12 ]12- are the first hybrid polyoxometalates in which classical (Group 5/6 metal based) and non-classical (late transition-metal based) polyoxometalate units are joined. Requiring no supporting groups, this co-condensation of polyoxotungstate and isopolyoxopalladate constituents also provides a logical link between POM-PdII coordination complexes and the young subclass of polyoxopalladates. Solid-state, solution, and gas-phase studies suggest interesting specific reactivities for these hybrids and point to several potential derivatives and functionalization strategies.
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Affiliation(s)
- Natalya V Izarova
- Jülich-Aachen Research Alliance (JARA-FIT) and Peter Grünberg Institute 6, Forschungszentrum Jülich, 52425, Jülich, Germany.
| | - Beatrix Santiago-Schübel
- Central Institute for Engineering, Electronics and Analytics 3, Forschungszentrum Jülich, 52425, Jülich, Germany
| | - Sabine Willbold
- Central Institute for Engineering, Electronics and Analytics 3, Forschungszentrum Jülich, 52425, Jülich, Germany
| | - Volkmar Heß
- Jülich-Aachen Research Alliance (JARA-FIT) and Peter Grünberg Institute 6, Forschungszentrum Jülich, 52425, Jülich, Germany.,Institute of Inorganic Chemistry, RWTH Aachen University, 52074, Aachen, Germany
| | - Paul Kögerler
- Jülich-Aachen Research Alliance (JARA-FIT) and Peter Grünberg Institute 6, Forschungszentrum Jülich, 52425, Jülich, Germany. .,Institute of Inorganic Chemistry, RWTH Aachen University, 52074, Aachen, Germany.
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19
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Özkar S, Finke RG. Palladium(0) Nanoparticle Formation, Stabilization, and Mechanistic Studies: Pd(acac)₂ as a Preferred Precursor, [Bu₄N]₂HPO₄ Stabilizer, plus the Stoichiometry, Kinetics, and Minimal, Four-Step Mechanism of the Palladium Nanoparticle Formation and Subsequent Agglomeration Reactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:3699-716. [PMID: 27046305 DOI: 10.1021/acs.langmuir.6b00013] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Palladium(0) nanoparticles continue to be important in the field of catalysis. However, and despite the many prior reports of Pd(0)n nanoparticles, missing is a study that reports the kinetically controlled formation of Pd(0)n nanoparticles with the simple stabilizer [Bu4N]2HPO4 in an established, balanced formation reaction where the kinetics and mechanism of the nanoparticle-formation reaction are also provided. It is just such studies that are the focus of the present work. Specifically, the present studies reveal that Pd(acac)2, in the presence of 1 equiv of [Bu4N]2HPO4 as stabilizer in propylene carbonate, serves as a preferred precatalyst for the kinetically controlled nucleation following reduction under 40 ± 1 psig initial H2 pressure at 22.0 ± 0.1 °C to yield 7 ± 2 nm palladium(0) nanoparticles. Studies of the balanced stoichiometry of the Pd(0)n nanoparticle-formation reaction shows that 1.0 Pd(acac)2 consumes 1.0 equiv of H2 and produces 1.0 equiv of Pd(0)n while also releasing 2.0 ± 0.2 equiv of acetylacetone. The inexpensive, readily available HPO4(2-) also proved to be as effective a Pd(0)n nanoparticle stabilizer as the more anionic, sterically larger, "Gold Standard" stabilizer P2W15Nb3O62(9-). The kinetics and associated minimal mechanism of formation of the [Bu4N]2HPO4-stabilized Pd(0)n nanoparticles are also provided, arguably the most novel part of the present studies, specifically the four-step mechanism of nucleation (A → B, rate constant k1), autocatalytic surface growth (A + B → 2B, rate constant k2), bimolecular agglomeration (B + B → C, rate constant k3), and secondary autocatalytic surface growth (A + C → 1.5C, rate constant k4), where A is Pd(acac)2, B represents the growing, smaller Pd(0)n nanoparticles, and C represents the larger, most catalytically active Pd(0)n nanoparticles. Additional details on the mechanism and catalytic properties of the resultant Pd(0)n·HPO4(2-) nanoparticles are provided in this work.
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Affiliation(s)
- Saim Özkar
- Department of Chemistry, Colorado State University , Fort Collins, Colorado 80523 United States
- Department of Chemistry, Middle East Technical University , 06800 Ankara, Turkey
| | - Richard G Finke
- Department of Chemistry, Colorado State University , Fort Collins, Colorado 80523 United States
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Breitwieser R, Auvray T, Volatron F, Salzemann C, Ngo AT, Albouy PA, Proust A, Petit C. Binary Superlattices from {Mo132} Polyoxometalates and Maghemite Nanocrystals: Long-Range Ordering and Fine-Tuning of Dipole Interactions. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:220-228. [PMID: 26578032 DOI: 10.1002/smll.201502127] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 09/19/2015] [Indexed: 06/05/2023]
Abstract
In the present article, the successful coassembly of spherical 6.2 nm maghemite (γ-Fe2O3) nanocrystals and giant polyoxometalates (POMs) such as 2.9 nm {Mo132} is demonstrated. To do so, colloidal solutions of oleic acid-capped γ-Fe2O3 and long-chain alkylammonium-encapsulated {Mo132 } dispersed in chloroform are mixed together and supported self-organized binary superlattices are obtained upon the solvent evaporation on immersed substrates. Both electronic microscopy and small angles X-ray scattering data reveal an AB-type structure and an enhanced structuration of the magnetic nanocrystals (MNCs) assembly with POMs in octahedral interstices. Therefore, {Mo132} acts as an efficient binder constituent for improving the nanocrystals ordering in 3D films. Interestingly, in the case of didodecyldimethylammonium (C12)-encapsulated POMs, the long-range ordered binary assemblies are obtained while preserving the nanocrystals magnetic properties due to weak POMs-MNCs interactions. On the other hand, POMs of larger effective diameter can be employed as spacer blocks for MNCs as shown by using {Mo132} capped with dioctadecyldimethylammonium (C18) displaying longer chains. In that case, it is shown that POMs can also be used for fine-tuning the dipolar interactions in γ-Fe2O3 nanocrystal assemblies.
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Affiliation(s)
- Romain Breitwieser
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 8232, Institut Parisien de Chimie Moléculaire, Université Pierre et Marie Curie, 4 place Jussieu, case courrier 42, F-75005, Paris CEDEX 05, France
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8233, MONARIS, Case courrier, 52, Université Pierre et Marie Curie, 4 place Jussieu, F-75005, Paris, France
| | - Thomas Auvray
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 8232, Institut Parisien de Chimie Moléculaire, Université Pierre et Marie Curie, 4 place Jussieu, case courrier 42, F-75005, Paris CEDEX 05, France
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8233, MONARIS, Case courrier, 52, Université Pierre et Marie Curie, 4 place Jussieu, F-75005, Paris, France
| | - Florence Volatron
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 8232, Institut Parisien de Chimie Moléculaire, Université Pierre et Marie Curie, 4 place Jussieu, case courrier 42, F-75005, Paris CEDEX 05, France
| | - Caroline Salzemann
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8233, MONARIS, Case courrier, 52, Université Pierre et Marie Curie, 4 place Jussieu, F-75005, Paris, France
| | - Anh-Tu Ngo
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8233, MONARIS, Case courrier, 52, Université Pierre et Marie Curie, 4 place Jussieu, F-75005, Paris, France
| | - Pierre-Antoine Albouy
- Laboratoire de Physique des solides, UMR CNRS 8502, Université Paris Sud, Bât. 510, 91405, Orsay CEDEX, France
| | - Anna Proust
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 8232, Institut Parisien de Chimie Moléculaire, Université Pierre et Marie Curie, 4 place Jussieu, case courrier 42, F-75005, Paris CEDEX 05, France
| | - Christophe Petit
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8233, MONARIS, Case courrier, 52, Université Pierre et Marie Curie, 4 place Jussieu, F-75005, Paris, France
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Khadempir S, Ahmadpour A, Hamed Mosavian MT, Ashraf N, Bamoharram FF, Fernández-Pacheco R, de la Fuente JM, Mitchell SG. Mechanistic insights into the activation process in electrocatalytic ethanol oxidation by phosphomolybdic acid-stabilised palladium(0) nanoparticles (PdNPs@PMo12). RSC Adv 2016. [DOI: 10.1039/c5ra22698h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A Keggin type polyoxometalate (POM), phosphomolybdic acid (PMo12), has been employed to encapsulate and stabilise pseudo-spherical Pd(0) nanoparticles (PdNPs).
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Affiliation(s)
- Sara Khadempir
- Department of Chemical Engineering
- Ferdowsi University of Mashhad
- Mashhad
- Iran
| | - Ali Ahmadpour
- Department of Chemical Engineering
- Ferdowsi University of Mashhad
- Mashhad
- Iran
| | | | - Narges Ashraf
- Department of Chemistry
- Faculty of Sciences
- Ferdowsi University of Mashhad
- Mashhad
- Iran
| | | | | | | | - Scott G. Mitchell
- Instituto de Ciencia de Materiales de Aragón-CSIC/Universidad de Zaragoza
- Spain
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22
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Lachkar D, Lacôte E. Bifunctional organocatalysis with squaramide-containing Dawson organo-polyoxotungstates. CR CHIM 2016. [DOI: 10.1016/j.crci.2015.05.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Izarova NV, Maksimovskaya RI, Willbold S, Kögerler P. Tetrapalladium-Containing Polyoxotungstate [PdII4(α-P2W15O56)2]16–: A Comparative Study. Inorg Chem 2014; 53:11778-84. [DOI: 10.1021/ic502080x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
| | | | | | - Paul Kögerler
- Institute
of Inorganic Chemistry, RWTH Aachen University, D-52074 Aachen, Germany
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