1
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Chaudhary A, Mathur D, Gaba R, Pasricha R, Sharma K. Greening up organic reactions with caffeine: applications, recent developments, and future directions. RSC Adv 2024; 14:8932-8962. [PMID: 38500612 PMCID: PMC10945742 DOI: 10.1039/d4ra00432a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Accepted: 03/10/2024] [Indexed: 03/20/2024] Open
Abstract
Numerous studies in the field of alkaloid chemistry have provided researchers with valuable insights into their unique properties as catalysts. Among the diverse natural catalysts, caffeine has emerged as a green, expedient, and biodegradable catalyst with high efficiency and applicability. Interest in using caffeine as a catalyst has burgeoned over the past few years with its role in diverse multicomponent reactions. Preparation of its imidazolium salts and further conversion to Nitrogen Heterocyclic Carbene (NHC) ligands and ionic liquids offers new paradigms. Caffeine has also played a multifaceted role as a support material in influencing the structural properties of nanoparticles. We hope that the chemistry of caffeine and its applications for sustainable organic transformations discussed in this review will stimulate new thinking and open new avenues in this field.
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Affiliation(s)
- Ankita Chaudhary
- Department of Chemistry, Maitreyi College, University of Delhi Delhi - 110 021 India
| | - Divya Mathur
- Department of Chemistry, Daulat Ram College, University of Delhi Delhi - 110 007 India
| | - Ritu Gaba
- Department of Chemistry, Maitreyi College, University of Delhi Delhi - 110 021 India
| | - Raaina Pasricha
- Department of Chemistry, Maitreyi College, University of Delhi Delhi - 110 021 India
| | - Khyati Sharma
- Department of Chemistry, Maitreyi College, University of Delhi Delhi - 110 021 India
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2
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Scattolin T, Tonon G, Botter E, Guillet SG, Tzouras NV, Nolan SP. Gold(I)-N-Heterocyclic Carbene Synthons in Organometallic Synthesis. Chemistry 2023; 29:e202301961. [PMID: 37463071 DOI: 10.1002/chem.202301961] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/14/2023] [Accepted: 07/17/2023] [Indexed: 07/20/2023]
Abstract
The prominent role of gold-N-heterocyclic carbene (NHC) complexes in numerous research areas such as homogeneous (photo)catalysis, medicinal chemistry and materials science has prompted organometallic chemists to design gold-based synthons that permit access to target complexes through simple synthetic steps under mild conditions. In this review, the main gold-NHC synthons employed in organometallic synthesis are discussed. Mechanistic aspects involved in their synthesis and reactivity as well as applications of gold-NHC synthons as efficient pre-catalysts, antitumor agents and/or photo-emissive materials are presented.
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Affiliation(s)
- Thomas Scattolin
- Dipartimento di Scienze Chimiche, Università degli studi di Padova, via Marzolo 1, 35131, Padova, Italy
| | - Giovanni Tonon
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Campus Scientifico, Via Torino 155, 30174, Venezia-Mestre, Italy
| | - Eleonora Botter
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Campus Scientifico, Via Torino 155, 30174, Venezia-Mestre, Italy
| | - Sebastien G Guillet
- Department of Chemistry and Centre for Sustainable Chemistry, Ghent University, Krijgslaan 281, S-3, 9000, Ghent, Belgium
| | - Nikolaos V Tzouras
- Department of Chemistry and Centre for Sustainable Chemistry, Ghent University, Krijgslaan 281, S-3, 9000, Ghent, Belgium
| | - Steven P Nolan
- Department of Chemistry and Centre for Sustainable Chemistry, Ghent University, Krijgslaan 281, S-3, 9000, Ghent, Belgium
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3
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Dar MO, Mir RH, Mohiuddin R, Masoodi MH, Sofi FA. Metal complexes of xanthine and its derivatives: Synthesis and biological activity. J Inorg Biochem 2023; 246:112290. [PMID: 37327591 DOI: 10.1016/j.jinorgbio.2023.112290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 06/08/2023] [Accepted: 06/09/2023] [Indexed: 06/18/2023]
Abstract
Xanthine and its derivatives are considered an important class of N-heterocyclic purine compounds that have gained significant importance in medicinal chemistry. N-heterocyclic carbene (NHC) and N-coordinated metal complexes of xanthine and its derivatives have revealed a range of new possibilities for their use as therapeutic agents in addition to their established catalytic behavior. The metal complexes of xanthine and its derivatives have been designed and synthesized for the exploration of their potential therapeutic applications. These metal complexes based on the xanthine scaffold exhibited various potential medicinal applications including anticancer, antibacterial, and antileishmanial activity. The metal complexes of xanthine and its derivatives shall pave the way for the rational design and development of new therapeutic agents. In the present comprehensive review, we highlighted the recent advancements in the synthesis and medicinal applications of metal complexes based on N-heterocyclic carbene (NHC) derived from xanthine scaffolds.
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Affiliation(s)
- Mohammad Ovais Dar
- Department of Pharmaceutical Chemistry, M. M. College of Pharmacy, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana 133207, India.
| | - Reyaz Hassan Mir
- Department of Pharmaceutical Sciences, School of Applied Sciences and Technology, University of Kashmir, Hazratbal, Srinagar 190006, J & K, India
| | - Roohi Mohiuddin
- Department of General Medicine, Sher-I-Kashmir Institute of Medical Sciences (SKIMS), Srinagar, Jammu and Kashmir 190001, India
| | - Mubashir H Masoodi
- Department of Pharmaceutical Sciences, School of Applied Sciences and Technology, University of Kashmir, Hazratbal, Srinagar 190006, J & K, India
| | - Firdoos Ahmad Sofi
- Department of Pharmaceutical Sciences, School of Applied Sciences and Technology, University of Kashmir, Hazratbal, Srinagar 190006, J & K, India.
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4
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Manganese(III) complexes with tetradentate O^C^C^O ligands: Synthesis, characterization and catalytic studies on the CO2 cycloaddition with epoxides. MOLECULAR CATALYSIS 2023. [DOI: 10.1016/j.mcat.2023.113006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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5
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Bevilacqua M, Roverso M, Bogialli S, Graiff C, Biffis A. From Au 11 to Au 13: Tailored Synthesis of Superatomic Di-NHC/PPh 3-Stabilized Molecular Gold Nanoclusters. Inorg Chem 2023; 62:1383-1393. [PMID: 36638827 PMCID: PMC9890486 DOI: 10.1021/acs.inorgchem.2c03331] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Herein, we report a new method to synthesize molecular gold nanoclusters (AuNCs) stabilized by phosphine (PR3) and di-N-heterocyclic carbene (di-NHC) ligands. The interaction of di-NHC gold(I) complexes, with the general formula [(di-NHC)Au2Cl2] with well-known [Au11(PPh3)8Cl2]Cl clusters provides three new classes of AuNCs through a controllable reaction sequence. The synthesis involves an initial ligand metathesis reaction to produce [Au11(di-NHC)(PPh3)6Cl2]+ (type 1 clusters), followed by a thermally induced rearrangement/metal complex addition with the formation of Au13 clusters [Au13(di-NHC)2(PPh3)4Cl4]+ (type 2 clusters). Finally, an additional metathesis process yields [Au13(di-NHC)3(PPh3)3Cl3]2+ (type 3 clusters). The electronic and steric properties of the employed di-NHC ligand affect the product distribution, leading to the isolation and full characterization of different clusters as the main product. A type 3 cluster has been also structurally characterized and was preliminarily found to be strongly emissive in solution.
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Affiliation(s)
- Matteo Bevilacqua
- Dipartimento
di Scienze Chimiche, Università degli
Studi di Padova, Via F. Marzolo 1, 35131Padova, Italy,Consorzio
per le Reattività Chimiche e la Catalisi (CIRCC), c/o Dipartimento
di Scienze Chimiche, Università degli
Studi di Padova, Via
F. Marzolo 1, 35131Padova, Italy
| | - Marco Roverso
- Dipartimento
di Scienze Chimiche, Università degli
Studi di Padova, Via F. Marzolo 1, 35131Padova, Italy
| | - Sara Bogialli
- Dipartimento
di Scienze Chimiche, Università degli
Studi di Padova, Via F. Marzolo 1, 35131Padova, Italy
| | - Claudia Graiff
- Dipartimento
di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università degli Studi di Parma, Parco Area delle Scienze 17/A, 43124Parma, Italy
| | - Andrea Biffis
- Dipartimento
di Scienze Chimiche, Università degli
Studi di Padova, Via F. Marzolo 1, 35131Padova, Italy,Consorzio
per le Reattività Chimiche e la Catalisi (CIRCC), c/o Dipartimento
di Scienze Chimiche, Università degli
Studi di Padova, Via
F. Marzolo 1, 35131Padova, Italy,
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6
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Kaußler C, Wragg D, Schmidt C, Moreno-Alcántar G, Jandl C, Stephan J, Fischer RA, Leoni S, Casini A, Bonsignore R. "Dynamical Docking" of Cyclic Dinuclear Au(I) Bis-N-heterocyclic Complexes Facilitates Their Binding to G-Quadruplexes. Inorg Chem 2022; 61:20405-20423. [PMID: 36484812 PMCID: PMC9953335 DOI: 10.1021/acs.inorgchem.2c03041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
With the aim to improve the design of metal complexes as stabilizers of noncanonical DNA secondary structures, namely, G-quadruplexes (G4s), a series of cyclic dinuclear Au(I) N-heterocyclic carbene complexes based on xanthine and benzimidazole ligands has been synthesized and characterized by various methods, including X-ray diffraction. Fluorescence resonance energy transfer (FRET) and CD DNA melting assays unraveled the compounds' stabilization properties toward G4s of different topologies of physiological relevance. Initial structure-activity relationships have been identified and recognize the family of xanthine derivatives as those more selective toward G4s versus duplex DNA. The binding modes and free-energy landscape of the most active xanthine derivative (featuring a propyl linker) with the promoter sequence cKIT1 have been studied by metadynamics. The atomistic simulations evidenced that the Au(I) compound interacts noncovalently with the top G4 tetrad. The theoretical results on the Au(I) complex/DNA Gibbs free energy of binding were experimentally validated by FRET DNA melting assays. The compounds have also been tested for their antiproliferative properties in human cancer cells in vitro, showing generally moderate activity. This study provides further insights into the biological activity of Au(I) organometallics acting via noncovalent interactions and underlines their promise for tunable targeted applications by appropriate chemical modifications.
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Affiliation(s)
- Clemens Kaußler
- Chair
of Medicinal and Bioinorganic Chemistry, Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching b. MünchenD-85748, Germany
| | - Darren Wragg
- Chair
of Medicinal and Bioinorganic Chemistry, Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching b. MünchenD-85748, Germany
| | - Claudia Schmidt
- Chair
of Medicinal and Bioinorganic Chemistry, Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching b. MünchenD-85748, Germany
| | - Guillermo Moreno-Alcántar
- Chair
of Medicinal and Bioinorganic Chemistry, Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching b. MünchenD-85748, Germany
| | - Christian Jandl
- Catalysis
Research Center & Department of Chemistry, Technische Universität München, Ernst-Otto-Fischer Str. 1, Garching b. MünchenD-85748, Germany
| | - Johannes Stephan
- Catalysis
Research Center & Department of Chemistry, Technische Universität München, Ernst-Otto-Fischer Str. 1, Garching b. MünchenD-85748, Germany
| | - Roland A. Fischer
- Catalysis
Research Center & Department of Chemistry, Technische Universität München, Ernst-Otto-Fischer Str. 1, Garching b. MünchenD-85748, Germany,Chair
of Inorganic and Metal-Organic Chemistry, Department of Chemistry, Technische Universität München, Ernst-Otto-Fischer Str. 1, Garching b. MünchenD-85748, Germany
| | - Stefano Leoni
- School
of Chemistry, Cardiff University, Park Place, CardiffCF10 3AT, U.K.
| | - Angela Casini
- Chair
of Medicinal and Bioinorganic Chemistry, Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching b. MünchenD-85748, Germany,
| | - Riccardo Bonsignore
- Dipartimento
di Scienze e Tecnologie Biologiche, Chimiche e Farmaceutiche, Università degli Studi di Palermo, Viale delle Scienze, Edificio 17, Palermo90128, Italy,
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7
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Bysewski O, Winter A, Liebing P, Schubert US. Noble Metal Complexes of a Bis-Caffeine Containing NHC Ligand. Molecules 2022; 27:molecules27134316. [PMID: 35807559 PMCID: PMC9268361 DOI: 10.3390/molecules27134316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Revised: 06/26/2022] [Accepted: 06/28/2022] [Indexed: 12/04/2022] Open
Abstract
N-Heterocyclic carbenes (NHCs) have seen more and more use over the years. The go-to systems that are usually considered are derivatives of benzimidazole or imidazole. Caffeine possesses an imidazole unit and was already utilized as a carbene-type ligand; however, its use within a tridentate bis-NHC system has—to the best of our knowledge—not been reported so far. The synthesis of the ligand is straightforward and metal complexes are readily available via silver-salt metathesis. A platinum(II) and a palladium(II) complex were isolated and a crystal structure of the former was examined. For the Pt(II) complex, luminescence is observed in solid state as well as in solution.
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Affiliation(s)
- Oliver Bysewski
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstr. 10, 07743 Jena, Germany; (O.B.); (A.W.)
- Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
| | - Andreas Winter
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstr. 10, 07743 Jena, Germany; (O.B.); (A.W.)
- Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
| | - Phil Liebing
- Institute for Inorganic and Analytical Chemistry (IAAC), Friedrich Schiller University Jena, Humboldtstr. 8, 07743 Jena, Germany;
| | - Ulrich S. Schubert
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstr. 10, 07743 Jena, Germany; (O.B.); (A.W.)
- Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
- Correspondence:
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8
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Das A, Schleinitz J, Karmazin L, Vincent B, Le Breton N, Rogez G, Guenet A, Choua S, Grimaud L, Desage‐El Murr M. A Single Bioinspired Hexameric Nickel Catechol–Alloxazine Catalyst Combines Metal and Radical Mechanisms for Alkene Hydrosilylation. Chemistry 2022; 28:e202200596. [DOI: 10.1002/chem.202200596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Indexed: 11/12/2022]
Affiliation(s)
- Agnideep Das
- Université de Strasbourg Institut de Chimie, CNRS UMR7177 67000 Strasbourg France
| | - Jules Schleinitz
- Laboratoire des biomolécules LBM, Chemistry Department École normale supérieure PSL University Sorbonne Université, CNRS 75005 Paris France
| | - Lydia Karmazin
- Université de Strasbourg Institut de Chimie, CNRS UMR7177 67000 Strasbourg France
| | - Bruno Vincent
- Université de Strasbourg Institut de Chimie, CNRS UMR7177 67000 Strasbourg France
| | - Nolwenn Le Breton
- Université de Strasbourg Institut de Chimie, CNRS UMR7177 67000 Strasbourg France
| | - Guillaume Rogez
- Institut de Physique et Chimie des Matériaux de Strasbourg Université de Strasbourg, CNRS, UMR 7504 67000 Strasbourg France
| | - Aurélie Guenet
- Université de Strasbourg Institut de Chimie, CNRS UMR7177 67000 Strasbourg France
| | - Sylvie Choua
- Université de Strasbourg Institut de Chimie, CNRS UMR7177 67000 Strasbourg France
| | - Laurence Grimaud
- Laboratoire des biomolécules LBM, Chemistry Department École normale supérieure PSL University Sorbonne Université, CNRS 75005 Paris France
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9
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Longhi A, Baron M, Rancan M, Bottaro G, Orian L, Graiff C, Roverso M, Menegazzo I, Armelao L, Bogialli S, Tubaro C. Silver(I) and gold(I) complexes with bitriazole‐based N‐heterocyclic carbene ligand: solid state features and behavior in solution. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Andrea Longhi
- Dipartimento di Scienze Chimiche Università degli Studi di Padova Padova Italy
| | - Marco Baron
- Dipartimento di Scienze Chimiche Università degli Studi di Padova Padova Italy
| | - Marzio Rancan
- ICMATE‐CNR, c/o Dipartimento di Scienze Chimiche Padova Italy
| | | | - Laura Orian
- Dipartimento di Scienze Chimiche Università degli Studi di Padova Padova Italy
| | - Claudia Graiff
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università degli Studi di Parma Parma Italy
| | - Marco Roverso
- Dipartimento di Scienze Chimiche Università degli Studi di Padova Padova Italy
| | - Ileana Menegazzo
- Dipartimento di Scienze Chimiche Università degli Studi di Padova Padova Italy
| | - Lidia Armelao
- Dipartimento di Scienze Chimiche Università degli Studi di Padova Padova Italy
- Dipartimento di Scienze Chimiche e Tecnologie dei Materiali, Consiglio Nazionale delle Ricerche Roma Italy
| | - Sara Bogialli
- Dipartimento di Scienze Chimiche Università degli Studi di Padova Padova Italy
- ICMATE‐CNR, c/o Dipartimento di Scienze Chimiche Padova Italy
| | - Cristina Tubaro
- Dipartimento di Scienze Chimiche Università degli Studi di Padova Padova Italy
- ICMATE‐CNR, c/o Dipartimento di Scienze Chimiche Padova Italy
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10
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Teng Q, Zhao Y, Lu Y, Liu Z, Chen H, Yuan D, Huynh HV, Meng Q. Synthesis, Characterization, and Catalytic Study of Caffeine-Derived N-heterocyclic Carbene Palladium Complexes. Organometallics 2022. [DOI: 10.1021/acs.organomet.1c00641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Qiaoqiao Teng
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, People’s Republic of China
| | - Yaru Zhao
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, People’s Republic of China
| | - Yuchen Lu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, People’s Republic of China
| | - Ziwei Liu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, People’s Republic of China
| | - Haiqun Chen
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, People’s Republic of China
| | - Dan Yuan
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s Republic of China
| | - Han Vinh Huynh
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore, Republic of Singapore
| | - Qi Meng
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, People’s Republic of China
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11
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De Marco R, Dal Grande M, Baron M, Orian L, Graiff C, Achard T, Bellemin‐Laponnaz S, Pöthig A, Tubaro C. Synthesis, Structural Characterization and Antiproliferative Activity of Gold(I) and Gold(III) Complexes Bearing Thioether‐Functionalized N‐Heterocyclic Carbenes. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Riccardo De Marco
- Dipartimento di Scienze Chimiche Università degli Studi di Padova via Marzolo 1 35131 Padova Italy
- Institut de Physique et Chimie des Matériaux de Strasbourg CNRS-Université de Strasbourg UMR7504 23 rue du Loess BP 43, 67034 Strasbourg France
| | - Marco Dal Grande
- Dipartimento di Scienze Chimiche Università degli Studi di Padova via Marzolo 1 35131 Padova Italy
| | - Marco Baron
- Dipartimento di Scienze Chimiche Università degli Studi di Padova via Marzolo 1 35131 Padova Italy
| | - Laura Orian
- Dipartimento di Scienze Chimiche Università degli Studi di Padova via Marzolo 1 35131 Padova Italy
| | - Claudia Graiff
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale Università degli Studi di Parma Parco Area delle Scienze 17/A 43124 Parma Italy
| | - Thierry Achard
- Institut de Physique et Chimie des Matériaux de Strasbourg CNRS-Université de Strasbourg UMR7504 23 rue du Loess BP 43, 67034 Strasbourg France
| | - Stéphane Bellemin‐Laponnaz
- Institut de Physique et Chimie des Matériaux de Strasbourg CNRS-Université de Strasbourg UMR7504 23 rue du Loess BP 43, 67034 Strasbourg France
| | - Alexander Pöthig
- Department of Chemistry & Catalysis Research Center Technische Universität München Ernst-Otto-Fischer-Straße 1 Garching bei München 85748 Germany
| | - Cristina Tubaro
- Dipartimento di Scienze Chimiche Università degli Studi di Padova via Marzolo 1 35131 Padova Italy
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