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Senthamarai T, Chandrashekhar VG, Gawande MB, Kalevaru NV, Zbořil R, Kamer PCJ, Jagadeesh RV, Beller M. Ultra-small cobalt nanoparticles from molecularly-defined Co-salen complexes for catalytic synthesis of amines. Chem Sci 2020; 11:2973-2981. [PMID: 34122798 PMCID: PMC8157512 DOI: 10.1039/c9sc04963k] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report the synthesis of in situ generated cobalt nanoparticles from molecularly defined complexes as efficient and selective catalysts for reductive amination reactions. In the presence of ammonia and hydrogen, cobalt–salen complexes such as cobalt(ii)–N,N′-bis(salicylidene)-1,2-phenylenediamine produce ultra-small (2–4 nm) cobalt-nanoparticles embedded in a carbon–nitrogen framework. The resulting materials constitute stable, reusable and magnetically separable catalysts, which enable the synthesis of linear and branched benzylic, heterocyclic and aliphatic primary amines from carbonyl compounds and ammonia. The isolated nanoparticles also represent excellent catalysts for the synthesis of primary, secondary as well as tertiary amines including biologically relevant N-methyl amines. We report the synthesis of in situ generated cobalt nanoparticles from molecularly defined complexes as efficient and selective catalysts for reductive amination reactions.![]()
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Affiliation(s)
| | - Vishwas G Chandrashekhar
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock Albert-Einstein-Str. 29a 18059 Rostock Germany
| | - Manoj B Gawande
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University, Olomouc Šlechtitelů 27 Olomouc 78371 Czech Republic
| | - Narayana V Kalevaru
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock Albert-Einstein-Str. 29a 18059 Rostock Germany
| | - Radek Zbořil
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University, Olomouc Šlechtitelů 27 Olomouc 78371 Czech Republic
| | - Paul C J Kamer
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock Albert-Einstein-Str. 29a 18059 Rostock Germany
| | - Rajenahally V Jagadeesh
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock Albert-Einstein-Str. 29a 18059 Rostock Germany
| | - Matthias Beller
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock Albert-Einstein-Str. 29a 18059 Rostock Germany
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Atmane KA, Michel C, Piquemal JY, Sautet P, Beaunier P, Giraud M, Sicard M, Nowak S, Losno R, Viau G. Control of the anisotropic shape of cobalt nanorods in the liquid phase: from experiment to theory… and back. NANOSCALE 2014; 6:2682-2692. [PMID: 24448646 DOI: 10.1039/c3nr03686c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The polyol process is one of the few methods allowing the preparation of metal nanoparticles in solution. Hexagonal close packed monocrystalline Co nanorods are easily obtained in basic 1,2-butanediol at 448 K after a few minutes using a Co(II) dicarboxylate precursor. By using a combined experimental and theoretical approach, this study aims at a better understanding of the growth of anisotropic cobalt ferromagnetic nanoparticles by the polyol process. The growth of Co nanorods along the c axis of the hexagonal system was clearly evidenced by transmission electron microscopy, while the mean diameter was found to be almost constant at about 15 nm. Powder X-ray diffraction data showed that metallic cobalt was generated at the expense of a non-reduced solid lamellar intermediate phase which can be considered as a carboxylate ligand reservoir. Density functional theory calculations combined with a thermodynamic approach unambiguously showed that the main parameter governing the shape of the objects is the chemical potential of the carboxylate ligand: the crystal habit was deeply modified from rods to platelets when increasing the concentration of the ligand, i.e. its chemical potential. The approach presented in this study could be extended to a large number of particle types and growth conditions, where ligands play a key role in determining the particle shape.
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Affiliation(s)
- Kahina Aït Atmane
- Université Paris Diderot, Sorbonne Paris Cité, ITODYS, CNRS UMR 7086, 15 rue J.-A. de Baïf, 75205 Paris Cedex 13, France.
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Nguyen CT, Tran TH, Lu X, Kasi RM. Self-assembled nanoparticles from thiol functionalized liquid crystalline brush block copolymers for dual encapsulation of doxorubicin and gold nanoparticles. Polym Chem 2014. [DOI: 10.1039/c3py01636f] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A facile approach to synthesize new thiol functionalized liquid crystalline brush block copolymers for dual encapsulation of an anticancer drug and inorganic nanoparticles.
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Affiliation(s)
- Chi Thanh Nguyen
- Polymer Program
- Institute of Materials Science
- University of Connecticut
- Storrs
- USA
| | - Thanh Huyen Tran
- Department of Pharmaceutical Sciences
- University of Connecticut
- Storrs
- USA
| | - Xiuling Lu
- Department of Pharmaceutical Sciences
- University of Connecticut
- Storrs
- USA
| | - Rajeswari M. Kasi
- Polymer Program
- Institute of Materials Science
- University of Connecticut
- Storrs
- USA
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Pan G, Zhu J, Ma S, Sun G, Yang X. Enhancing the electromagnetic performance of Co through the phase-controlled synthesis of hexagonal and cubic Co nanocrystals grown on graphene. ACS APPLIED MATERIALS & INTERFACES 2013; 5:12716-24. [PMID: 24266516 DOI: 10.1021/am404117v] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Cobalt is a promising soft metallic magnetic material used for important applications in the field of absorbing stealth technology, especially for absorbing centimeter waves. However, it frequently presents a weak dielectric property because of its instability, aggregation, and crystallographic form. A method for enhancing the electromagnetic property of metal Co via phase-controlled synthesis of Co nanostructures grown on graphene (GN) networks has been developed. Hexagonal close-packed cobalt (α-Co) nanocrystals and face-centered cubic cobalt (β-Co) nanospheres with uniform size and high dispersion have been successfully assembled on GN nanosheets via a facile one-step solution-phase strategy under different reaction conditions in which the exfoliated graphite oxide (graphene oxide, GO) nanosheets were reduced along with the formation of Co nanocrystals. The as-synthesized Co/GN nanocomposites showed excellent microwave absorbability in comparison with the corresponding Co nanocrystals or GN, especially for the nanocomposites of GN and α-Co nanocrystals (the reflection loss is -47.5 dB at 11.9 GHz), which was probably because of the special electrical properties of the cross-linked GN nanosheets and the perfect electromagnetic match in their microstructure as well as the small particle size of Co nanocrystals. The approach is convenient and effective. Some magnetic metal or alloy materials can also be prepared via this route because of its versatility.
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Affiliation(s)
- Guohua Pan
- Beijing Key Laboratory of Energy Conversion and Storage Materials and College of Chemistry, Beijing Normal University , Beijing 100875, China
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Saliba S, Mingotaud C, Kahn ML, Marty JD. Liquid crystalline thermotropic and lyotropic nanohybrids. NANOSCALE 2013; 5:6641-6661. [PMID: 23817742 DOI: 10.1039/c3nr01175e] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This review is meant to give the reader an insight into hybrids incorporating different types of nanoparticles, e.g. metallic or metal oxides, within different types of lyotropic and thermotropic liquid crystals, from relatively small calamitic molecules to the larger discotics and polymers. In particular, this review highlights the importance of nanoparticle-liquid crystal interactions in accessing hybrid materials that exhibit synergetic properties.
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Affiliation(s)
- Sarmenio Saliba
- Laboratoire IMRCP, CNRS UMR 5623, University of Toulouse, 118, route de Narbonne, 31062, Toulouse, France
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Dasgupta D, Shishmanova IK, Ruiz-Carretero A, Lu K, Verhoeven M, van Kuringen HPC, Portale G, Leclère P, Bastiaansen CWM, Broer DJ, Schenning APHJ. Patterned Silver Nanoparticles embedded in a Nanoporous Smectic Liquid Crystalline Polymer Network. J Am Chem Soc 2013; 135:10922-5. [DOI: 10.1021/ja404825y] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
| | | | | | | | | | | | - Giuseppe Portale
- Netherlands Organization for
Scientific Research (NWO), European Synchrotron Radiation Facility (ESRF), DUBBLE-CRG, Grenoble, F-38043, France
| | - Philippe Leclère
- Laboratory for Chemistry of
Novel Materials, Center for Innovation and Research in Materials and
Polymers (CIRMAP), University of Mons (UMONS), Place du Parc 20, B 7000 Mons, Belgium
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Moukarzel W, Marty JD, Appelhans D, Mauzac M, Fitremann J. Synthesis of linear and hyperbranched sugar-grafted polysiloxanes using N
-hydroxysuccinimide-activated esters. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/pola.26755] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Waêl Moukarzel
- CNRS; Laboratoire des IMRCP; UMR 5623, Université Paul Sabatier; 31062 Toulouse Cedex 9 France
- Université de Toulouse; Laboratoire des IMRCP, UMR 5623, Université Paul Sabatier; 31062 Toulouse Cedex 9 France
| | - Jean-Daniel Marty
- CNRS; Laboratoire des IMRCP; UMR 5623, Université Paul Sabatier; 31062 Toulouse Cedex 9 France
- Université de Toulouse; Laboratoire des IMRCP, UMR 5623, Université Paul Sabatier; 31062 Toulouse Cedex 9 France
| | - Dietmar Appelhans
- Leibniz-Institut für Polymerforschung Dresden e.V.; D-01069 Dresden Germany
| | - Monique Mauzac
- CNRS; Laboratoire des IMRCP; UMR 5623, Université Paul Sabatier; 31062 Toulouse Cedex 9 France
- Université de Toulouse; Laboratoire des IMRCP, UMR 5623, Université Paul Sabatier; 31062 Toulouse Cedex 9 France
| | - Juliette Fitremann
- CNRS; Laboratoire des IMRCP; UMR 5623, Université Paul Sabatier; 31062 Toulouse Cedex 9 France
- Université de Toulouse; Laboratoire des IMRCP, UMR 5623, Université Paul Sabatier; 31062 Toulouse Cedex 9 France
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Lara P, Philippot K, Chaudret B. Organometallic Ruthenium Nanoparticles: A Comparative Study of the Influence of the Stabilizer on their Characteristics and Reactivity. ChemCatChem 2012. [DOI: 10.1002/cctc.201200666] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Nealon GL, Greget R, Dominguez C, Nagy ZT, Guillon D, Gallani JL, Donnio B. Liquid-crystalline nanoparticles: Hybrid design and mesophase structures. Beilstein J Org Chem 2012; 8:349-70. [PMID: 22509204 PMCID: PMC3326612 DOI: 10.3762/bjoc.8.39] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Accepted: 02/09/2012] [Indexed: 01/28/2023] Open
Abstract
Liquid-crystalline nanoparticles represent an exciting class of new materials for a variety of potential applications. By combining supramolecular ordering with the fluid properties of the liquid-crystalline state, these materials offer the possibility to organise nanoparticles into addressable 2-D and 3-D arrangements exhibiting high processability and self-healing properties. Herein, we review the developments in the field of discrete thermotropic liquid-crystalline nanoparticle hybrids, with special emphasis on the relationship between the nanoparticle morphology and the nature of the organic ligand coating and their resulting phase behaviour. Mechanisms proposed to explain the supramolecular organisation of the mesogens within the liquid-crystalline phases are discussed.
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Affiliation(s)
- Gareth L Nealon
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-Université de Strasbourg (UMR 7504), 23 rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
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Gual A, Godard C, Castillón S, Curulla-Ferré D, Claver C. Colloidal Ru, Co and Fe-nanoparticles. Synthesis and application as nanocatalysts in the Fischer–Tropsch process. Catal Today 2012. [DOI: 10.1016/j.cattod.2011.11.025] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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11
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In Situ and Ex Situ Syntheses of Magnetic Liquid Crystalline Materials: A Comparison. Polymers (Basel) 2012. [DOI: 10.3390/polym4010448] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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