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Bouchmella K, Lion Q, Gervais C, Cardoso MB. Impact of Mesoporous Silica Functionalization Fine-Tuning on Antibiotic Uptake/Delivery and Bactericidal Activity. ACS OMEGA 2023; 8:12154-12164. [PMID: 37033793 PMCID: PMC10077561 DOI: 10.1021/acsomega.2c08065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 03/08/2023] [Indexed: 06/19/2023]
Abstract
The mesoporous SBA-15 material was surface-functionalized with amino and carboxylic acid groups and used as a platform to investigate the interaction of these chemical groups with tetracycline, kanamycin, and ampicillin antibiotics. The interactions between the antibiotic and the functionalized surfaces were characterized using two-dimensional 1H-13C HETCOR CP MAS and FTIR spectroscopy and indicated that -COO- NH3 + bondings had been formed between chemical groups on the silica surface and drug molecules. The surface modification resulted in higher kanamycin and ampicillin loadings and a slow-release rate, and all synthesized systems showed antibacterial activity against susceptible Escherichia coli bacteria. Almost total death of bacteria was obtained using a few ppm of tetracycline- and kanamycin-loaded systems, whereas the ampicillin-loaded one showed lower bactericidal activity than free ampicillin.
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Affiliation(s)
- Karim Bouchmella
- Brazilian
Synchrotron Light Laboratory (LNLS), Brazilian
Center for Research in Energy and Materials (CNPEM), P.O. Box 6192, Campinas CEP 13083-970, SP, Brazil
- Chemistry
Institute (IQ), Universidade Estadual de
Campinas (UNICAMP), P.O.
Box 6154, Campinas CEP
13083-970, SP, Brazil
- ICGM, University
Montpellier, CNRS, ENSCM, 34095 Montpellier, France
| | - Quentin Lion
- Brazilian
Synchrotron Light Laboratory (LNLS), Brazilian
Center for Research in Energy and Materials (CNPEM), P.O. Box 6192, Campinas CEP 13083-970, SP, Brazil
- Interdisciplinary
Cluster for Applied Genoproteomics, University
of Liege, Liege 4000, Belgium
- Laboratory
of Medical Chemistry, University of Liege, Liege 4000, Belgium
- GIGA Stem
Cells, University of Liege, Liege 4000, Belgium
| | - Christel Gervais
- LCMCP
- Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Université, 4 place Jussieu, 75252 Paris Cedex 05, France
| | - Mateus Borba Cardoso
- Brazilian
Synchrotron Light Laboratory (LNLS), Brazilian
Center for Research in Energy and Materials (CNPEM), P.O. Box 6192, Campinas CEP 13083-970, SP, Brazil
- Chemistry
Institute (IQ), Universidade Estadual de
Campinas (UNICAMP), P.O.
Box 6154, Campinas CEP
13083-970, SP, Brazil
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2
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Samudrala KK, Conley MP. Effects of surface acidity on the structure of organometallics supported on oxide surfaces. Chem Commun (Camb) 2023; 59:4115-4127. [PMID: 36912586 DOI: 10.1039/d3cc00047h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
Well-defined organometallics supported on high surface area oxides are promising heterogeneous catalysts. An important design factor in these materials is how the metal interacts with the functionalities on an oxide support, commonly anionic X-type ligands derived from the reaction of an organometallic M-R with an -OH site on the oxide. The metal can either form a covalent M-O bond or form an electrostatic M+⋯-O ion-pair, which impacts how well-defined organometallics will interact with substrates in catalytic reactions. A less common reaction pathway involves the reaction of a Lewis site on the oxide with the organometallic, resulting in abstraction to form an ion-pair, which is relevant to industrial olefin polymerization catalysts. This Feature Article views the spectrum of reactivity between an organometallic and an oxide through the prism of Brønsted and/or Lewis acidity of surface sites and draws analogies to the molecular frame where Lewis and Brønsted acids are known to form reactive ion-pairs. Applications of the well-defined sites developed in this article are also discussed.
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Affiliation(s)
| | - Matthew P Conley
- Department of Chemistry, University of California, Riverside, California 92521, USA.
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3
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Novel Drug and Gene Delivery System and Imaging Agent Based on Marine Diatom Biosilica Nanoparticles. Mar Drugs 2022; 20:md20080480. [PMID: 36005484 PMCID: PMC9410069 DOI: 10.3390/md20080480] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 07/16/2022] [Accepted: 07/18/2022] [Indexed: 11/22/2022] Open
Abstract
Mesoporous silica nanoparticles (MSNs) have great potential for applications as a drug delivery system (DDS) due to their unique properties such as large pore size, high surface area, biocompatibility, biodegradability, and stable aqueous dispersion. The MSN-mediated DDS can carry chemotherapeutic agents, optical sensors, photothermal agents, short interfering RNA (siRNA), and gene therapeutic agents. The MSN-assisted imaging techniques are applicable in cancer diagnosis. However, their synthesis via a chemical route requires toxic chemicals and is challenging, time-consuming, and energy-intensive, making the process expensive and non-viable. Fortunately, nature has provided a viable alternative material in the form of biosilica from marine resources. In this review, the applications of biosilica nanoparticles synthesized from marine diatoms in the field of drug delivery, biosensing, imaging agents, and regenerative medicine, are highlighted. Insights into the use of biosilica in the field of DDSs are elaborated, with a focus on different strategies to improve the physico-chemical properties with regards to drug loading and release efficiency, targeted delivery, and site-specific binding capacity by surface functionalization. The limitations, as well as the future scope to develop them as potential drug delivery vehicles and imaging agents, in the overall therapeutic management, are discussed.
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4
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Bekyarova E, Conley MP. The coordination chemistry of oxide and nanocarbon materials. Dalton Trans 2022; 51:8557-8570. [PMID: 35586978 DOI: 10.1039/d2dt00459c] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Understanding how a ligand affects the steric and electronic properties of a metal is the cornerstone of the inorganic chemistry enterprise. What happens when the ligand is an extended surface? This question is central to the design and implementation of state-of-the-art functional materials containing transition metals. This perspective will describe how these two very different sets of extended surfaces can form well-defined coordination complexes with metals. In the Green formalism, functionalities on oxide surfaces react with inorganics to form species that contain X-type or LX-type interactions between the metal and the oxide. Carbon surfaces are neutral L-type ligands; this perspective focuses on carbons that donate six electrons to a metal. The nature of this interaction depends on the curvature, and thereby orbital overlap, between the metal and the extended π-system from the nanocarbon.
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Affiliation(s)
- Elena Bekyarova
- Department of Chemistry, University of California, Riverside, California 92521, USA.
| | - Matthew P Conley
- Department of Chemistry, University of California, Riverside, California 92521, USA.
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5
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Laskowska M, Pastukh O, Fedorchuk A, Schabikowski M, Kowalczyk P, Zalasiński M, Laskowski Ł. Nanostructured Silica with Anchoring Units: The 2D Solid Solvent for Molecules and Metal Ions. Int J Mol Sci 2020; 21:E8137. [PMID: 33143359 PMCID: PMC7663599 DOI: 10.3390/ijms21218137] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 10/21/2020] [Accepted: 10/27/2020] [Indexed: 01/27/2023] Open
Abstract
The ability to organize, separate and manipulate individual molecules and ions on a surface opens up almost unlimited opportunities. However, it often requires complex techniques and a proper support material. With this in mind, we show a new concept of 2D solid solvents and review a simple and efficient procedure which is based on nanostructured forms of silica with anchoring units. We describe silica supports, such as spherical nanoparticles and mesoporous silica structures, as well as review the methods for chemical modification of the surface of silica with the functional groups. Finally, we present a few particular examples of the immobilization of molecules and ions on the surface of 2D solid solvents along with the experimental investigation of the obtained materials.
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Affiliation(s)
- Magdalena Laskowska
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland; (M.L.); (O.P.); (A.F.); (M.S.)
| | - Oleksandr Pastukh
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland; (M.L.); (O.P.); (A.F.); (M.S.)
| | - Andrii Fedorchuk
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland; (M.L.); (O.P.); (A.F.); (M.S.)
| | - Mateusz Schabikowski
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland; (M.L.); (O.P.); (A.F.); (M.S.)
| | - Paweł Kowalczyk
- Department of Animal Nutrition, The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, 05-110 Jabłonna, Poland;
| | - Marcin Zalasiński
- Department of Intelligent Computer Systems, Czestochowa University of Technology, 42-200 Czestochowa, Poland;
| | - Łukasz Laskowski
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland; (M.L.); (O.P.); (A.F.); (M.S.)
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6
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Witzke RJ, Chapovetsky A, Conley MP, Kaphan DM, Delferro M. Nontraditional Catalyst Supports in Surface Organometallic Chemistry. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03350] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ryan J. Witzke
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Alon Chapovetsky
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Matthew P. Conley
- Department of Chemistry, University of California, Riverside, Riverside, California 92521, United States
| | - David M. Kaphan
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Massimiliano Delferro
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
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7
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Espinosa‐Jalapa NA, Bauer JO. Controlled Synthesis and Molecular Structures of Methoxy‐, Amino‐, and Chloro‐Functionalized Disiloxane Building Blocks. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202000049] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Noel Angel Espinosa‐Jalapa
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 93053 Regensburg Germany
| | - Jonathan O. Bauer
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 93053 Regensburg Germany
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8
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Culver DB, Huynh W, Tafazolian H, Conley MP. Solid-State 45Sc NMR Studies of Cp* 2Sc–OR (R = CMe 2CF 3, CMe(CF 3) 2, C(CF 3) 3, SiPh 3) and Relationship to the Structure of Cp* 2Sc-Sites Supported on Partially Dehydroxylated Silica. Organometallics 2020. [DOI: 10.1021/acs.organomet.9b00840] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Damien B. Culver
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Winn Huynh
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Hosein Tafazolian
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Matthew P. Conley
- Department of Chemistry, University of California, Riverside, California 92521, United States
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9
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Huynh W, Conley MP. Origin of the 29Si NMR chemical shift in R3Si–X and relationship to the formation of silylium (R3Si+) ions. Dalton Trans 2020; 49:16453-16463. [DOI: 10.1039/d0dt02099k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The origin in deshielding of 29Si NMR chemical shifts in R3Si–X, where X = H, OMe, Cl, OTf, [CH6B11X6], toluene, and OX (OX = surface oxygen), as well as iPr3Si+ and Mes3Si+ were studied using DFT methods.
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Affiliation(s)
- Winn Huynh
- Department of Chemistry
- University of California
- Riverside
- USA
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10
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Culver DB, Venkatesh A, Huynh W, Rossini AJ, Conley MP. Al(OR F) 3 (R F = C(CF 3) 3) activated silica: a well-defined weakly coordinating surface anion. Chem Sci 2019; 11:1510-1517. [PMID: 34084380 PMCID: PMC8148071 DOI: 10.1039/c9sc05904k] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Weakly Coordinating Anions (WCAs) containing electron deficient delocalized anionic fragments that are reasonably inert allow for the isolation of strong electrophiles. Perfluorinated borates, perfluorinated aluminum alkoxides, and halogenated carborane anions are a few families of WCAs that are commonly used in synthesis. Application of similar design strategies to oxide surfaces is challenging. This paper describes the reaction of Al(ORF)3*PhF (RF = C(CF3)3) with silica partially dehydroxylated at 700 °C (SiO2-700) to form the bridging silanol [triple bond, length as m-dash]Si-OH⋯Al(ORF)3 (1). DFT calculations using small clusters to model 1 show that the gas phase acidity (GPA) of the bridging silanol is 43.2 kcal mol-1 lower than the GPA of H2SO4, but higher than the strongest carborane acids, suggesting that deprotonated 1 would be a WCA. Reactions of 1 with NOct3 show that 1 forms weaker ion-pairs than classical WCAs, but stronger ion-pairs than carborane or borate anions. Though 1 forms stronger ion-pairs than these state-of-the-art WCAs, 1 reacts with alkylsilanes to form silylium type surface species. To the best of our knowledge, this is the first example of a silylium supported on derivatized silica.
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Affiliation(s)
- Damien B Culver
- Department of Chemistry, University of California Riverside California 92521 USA
| | - Amrit Venkatesh
- Department of Chemistry, Iowa State University Ames Iowa 50011 USA
| | - Winn Huynh
- Department of Chemistry, University of California Riverside California 92521 USA
| | - Aaron J Rossini
- Department of Chemistry, Iowa State University Ames Iowa 50011 USA
| | - Matthew P Conley
- Department of Chemistry, University of California Riverside California 92521 USA
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11
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Fang L, Albela B, Yang B, Zheng Y, Wu P, He M, Bonneviot L. Size-Dependent Catalytic Activity of Oxo-Hydroxo Titanium Sub-Nanoislets Grafted on Organically Modified Mesoporous Silica. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:12713-12722. [PMID: 30281317 DOI: 10.1021/acs.langmuir.8b01932] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The reaction between titanium alkoxides, [Ti(OR)4], and surface silanol groups is widely used to generate grafted oxo-hydroxo titanium species, whose size is difficult to control. Partial capping of the surface silanols in the presence of the masking pattern of self-repelling tetramethylammonium ions allows us to isolate surface silanol islets, on which isolated titanium ions and dimeric oxo titanium species can be generated up to 2 Ti/Si mol %. Above this loading, and up to ∼8 Ti/Si mol %, higher oligomers (trimers, hexamers, octamers, and so on) are formed, reaching the size obtained at much lower loadings (<1 Ti/Si mol %) on a nonmodified silica surface. The downsizing effect produced on our organically modified surface is monitored from the blue-shift of the charge-transfer band of the Ti(IV) ions, measured by reflectance UV-visible spectroscopy. It is also mirrored by a higher catalytic activity in cyclohexene epoxidation, revealing that it is not only the isolated Ti species that are active but also the oligomers. Regarding the latter, the smaller they are, the more active they are.
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Affiliation(s)
- Lin Fang
- Laboratoire de Chimie, Ecole Normale Supérieure de Lyon , Université de Lyon , 46 Allée d'Italie , 69364 Lyon Cedex 07, France
- Shanghai Key Lab of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , China
| | - Belén Albela
- Laboratoire de Chimie, Ecole Normale Supérieure de Lyon , Université de Lyon , 46 Allée d'Italie , 69364 Lyon Cedex 07, France
- Shanghai Key Lab of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , China
| | - Boting Yang
- Shanghai Key Lab of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , China
| | - Yuting Zheng
- Laboratoire de Chimie, Ecole Normale Supérieure de Lyon , Université de Lyon , 46 Allée d'Italie , 69364 Lyon Cedex 07, France
- Shanghai Key Lab of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , China
| | - Peng Wu
- Shanghai Key Lab of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , China
| | - Mingyuan He
- Shanghai Key Lab of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , China
| | - Laurent Bonneviot
- Laboratoire de Chimie, Ecole Normale Supérieure de Lyon , Université de Lyon , 46 Allée d'Italie , 69364 Lyon Cedex 07, France
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12
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Kaźmierczak J, Kuciński K, Szudkowska-Frątczak J, Hreczycho G. Highly Efficient Synthesis of Boron- and Germanium-Substituted Unsymmetrical Disilazanes. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700083] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Joanna Kaźmierczak
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Umultowska 89b 61-614 Poznań Poland
| | - Krzysztof Kuciński
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Umultowska 89b 61-614 Poznań Poland
| | | | - Grzegorz Hreczycho
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Umultowska 89b 61-614 Poznań Poland
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13
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14
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Liang Y, Meixner M. Organoindium-modified monodisperse ellipsoid-/platelet-like periodic mesoporous silicas. Dalton Trans 2017; 46:7495-7505. [DOI: 10.1039/c7dt01132f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Indium-modified mondisperse ellipsoid-/platelet-like large-pore periodic mesoporous silica nanoparticles (MMSNs) SBA-15 have been prepared via molecular grafting of In[N(SiMe3)2]3. Surface ligand exchange led to the formation of heteroleptic In species, and the resulting surface In species were converted into crystalline In2O3 nanoparticles by calcination.
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Affiliation(s)
- Yucang Liang
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- 72076 Tübingen
- Germany
| | - Martin Meixner
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- 72076 Tübingen
- Germany
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15
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Hydrogen bonding principles in inclusion compounds of triphenylsilanol and pyrrolidine: Synthesis and structural features of [(Ph3SiOH)4·HN(CH2)4] and [Ph3SiOH·HN(CH2)4·CH3CO2H]. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.07.026] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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16
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Gong H, Xie Z, Liu M, Sun H, Zhu H, Guo H. Research on redox-responsive mesoporous silica nanoparticles functionalized with PEG via a disulfide bond linker as drug carrier materials. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3595-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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17
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Park JW, Kim DS, Kim MS, Choi JH, Jun CH. A method for introducing organic functional groups on silica surfaces using a functionalized vinylsilane containing polymer. Polym Chem 2015. [DOI: 10.1039/c4py01148a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new method for introducing robustly bound organic functional groups on the silica surface using a vinylsilane-containing polymer is developed.
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Affiliation(s)
- Jung-Woo Park
- Department of Chemistry
- Yonsei University
- Seoul
- Korea(South)
| | - Dong-Su Kim
- Department of Chemistry
- Yonsei University
- Seoul
- Korea(South)
| | - Min-Seok Kim
- Department of Chemistry
- Yonsei University
- Seoul
- Korea(South)
| | - Ji-Hwan Choi
- Department of Chemistry
- Yonsei University
- Seoul
- Korea(South)
| | - Chul-Ho Jun
- Department of Chemistry
- Yonsei University
- Seoul
- Korea(South)
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18
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Fabrication of mesoporous Fe3O4@SiO2@CTAB–SiO2 magnetic microspheres with a core/shell structure and their efficient adsorption performance for the removal of trace PFOS from water. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2014.10.044] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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19
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Preparation of silica-based surface-imprinted core–shell nanoadsorbents for the selective recognition of sulfamethazine via reverse atom transfer radical precipitation polymerization. JOURNAL OF POLYMER RESEARCH 2014. [DOI: 10.1007/s10965-014-0520-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Bauer JO, Strohmann C. Stereoselektive Synthese siliciumstereogener Aminomethoxysilane: ein einfacher Zugang zu hoch enantiomerenangereicherten Siloxanen. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307826] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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21
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Bauer JO, Strohmann C. Stereoselective Synthesis of Silicon-Stereogenic Aminomethoxysilanes: Easy Access to Highly Enantiomerically Enriched Siloxanes. Angew Chem Int Ed Engl 2013; 53:720-4. [DOI: 10.1002/anie.201307826] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Indexed: 11/12/2022]
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22
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Smart KA, Grellier M, Vendier L, Mason SA, Capelli SC, Albinati A, Sabo-Etienne S. Step-by-Step Introduction of Silazane Moieties at Ruthenium: Different Extents of Ru–H–Si Bond Activation. Inorg Chem 2013; 52:2654-61. [DOI: 10.1021/ic302682f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Katharine A. Smart
- LCC (Laboratoire de Chimie de Coordination), CNRS, 205 Route de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, F-31077 Toulouse, France
| | - Mary Grellier
- LCC (Laboratoire de Chimie de Coordination), CNRS, 205 Route de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, F-31077 Toulouse, France
| | - Laure Vendier
- LCC (Laboratoire de Chimie de Coordination), CNRS, 205 Route de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, F-31077 Toulouse, France
| | - Sax A. Mason
- Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France
| | - Silvia C. Capelli
- Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France
| | - Alberto Albinati
- Dipartimento di Chimica, Università di Milano, Via C. Golgi, 19, 20133
Milan, Italy
| | - Sylviane Sabo-Etienne
- LCC (Laboratoire de Chimie de Coordination), CNRS, 205 Route de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, F-31077 Toulouse, France
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23
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Liang Y, Anwander R. Nanostructured catalysts via metal amide-promoted smart grafting. Dalton Trans 2013; 42:12521-45. [DOI: 10.1039/c3dt51346g] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Crozier AR, Schädle C, Maichle-Mössmer C, Törnroos KW, Anwander R. Synthesis and grafting of CAN-derived tetravalent cerium alkoxide silylamide precursors onto mesoporous silica MCM-41. Dalton Trans 2013; 42:5491-9. [DOI: 10.1039/c3dt33005b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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25
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Liang Y, Erichsen ES, Anwander R. Functionalization of large-pore periodic mesoporous silicas: metal silylamide and isopropoxide molecular grafting and secondary surface ligand exchange. Dalton Trans 2013; 42:6922-35. [DOI: 10.1039/c3dt33041a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Anchored Pd-complexes in mesoporous supports: Synthesis, characterization and catalysis studies for carbonylation reactions. Catal Today 2012. [DOI: 10.1016/j.cattod.2012.04.047] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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27
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Abstract
Mesoporous silica nanoparticles are receiving growing attention by the scientific biomedical community. Among the different types of inorganic nanomaterials, mesoporous silica nanoparticles have emerged as promising multifunctional platforms for nanomedicine. Since their introduction in the drug delivery landscape in 2001, mesoporous materials for drug delivery are receiving growing scientific interest for their potential applications in the biotechnology and nanomedicine fields. The ceramic matrix efficiently protects entrapped guest molecules against enzymatic degradation or denaturation induced by pH and temperature as no swelling or porosity changes take place as a response to variations in the surrounding medium. It is possible to load huge amounts of cargo into the mesopore voids and capping the pore entrances with different nanogates. The application of a stimulus provokes the nanocap removal and triggers the departure of the cargo. This strategy permits the design of stimuli-responsive drug delivery nanodevices.
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Affiliation(s)
- María Vallet-Regí
- Departamento de Química Inorgánica y Bioinorgánica, Facultad de Farmacia, UCM, Centro de Investigación Biomédica en Red, Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28040 Madrid, Spain
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Bauer JO, Strohmann C. One-step conversion of methoxysilanes to aminosilanes: a convenient synthetic strategy to N,O-functionalised organosilanes. Chem Commun (Camb) 2012; 48:7212-4. [PMID: 22691938 DOI: 10.1039/c2cc32727a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A straightforward substitution of silicon-bonded methoxy groups by a lithium amide leading to aminomethoxysilanes is presented. DFT calculations allow thermodynamic insight into the unusual equilibrium conditions. The applicability of N,O-functionalised organosilanes is exemplified by the convenient synthesis of an unsymmetrical methoxydisiloxane.
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Affiliation(s)
- Jonathan O Bauer
- Anorganische Chemie, Technische Universität Dortmund, Otto-Hahn-Strasse 6, D-44227 Dortmund, Germany
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29
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Michel O, König S, Törnroos KW, Maichle-Mössmer C, Anwander R. Surface Organobarium and Organomagnesium Chemistry on Periodic Mesoporous Silica MCM-41: Convergent and Sequential Approaches Traced by Molecular Models. Chemistry 2011; 17:11857-67. [DOI: 10.1002/chem.201101756] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2011] [Indexed: 11/08/2022]
Affiliation(s)
- Olaf Michel
- Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
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30
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31
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Bartoli G, Marcantoni E, Marcolini M, Sambri L. Applications of CeCl(3) as an environmental friendly promoter in organic chemistry. Chem Rev 2011; 110:6104-43. [PMID: 20731375 DOI: 10.1021/cr100084g] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Giuseppe Bartoli
- Department of Organic Chemistry A. Mangini, University of Bologna, viale Risorgimento 4, I-40156 Bologna, Italy
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32
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Deschner T, Lønstad BT, Widenmeyer M, Anwander R. Functionalization of MCM-41 and SBA-1 with titanium(iv) (silyl)amides. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm04382f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Wu SH, Hung Y, Mou CY. Mesoporous silica nanoparticles as nanocarriers. Chem Commun (Camb) 2011; 47:9972-85. [DOI: 10.1039/c1cc11760b] [Citation(s) in RCA: 279] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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34
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Silveira GQ, Vargas MD, Ronconi CM. Nanoreservoir operated by ferrocenyl linker oxidation with molecular oxygen. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm03738a] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Park JW, Park YJ, Jun CH. Post-grafting of silica surfaces with pre-functionalized organosilanes: new synthetic equivalents of conventional trialkoxysilanes. Chem Commun (Camb) 2011; 47:4860-71. [DOI: 10.1039/c1cc00038a] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Singh B, Jain SL, Rana BS, Khatri PK, Sinha AK, Sain B. Silica-Immobilized Highly Dispersed Oxo-Rhenium and its Catalytic Activity for the Direct Synthesis of Nitrones. ChemCatChem 2010. [DOI: 10.1002/cctc.201000121] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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37
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Park JW, Jun CH. Transition-Metal-Catalyzed Immobilization of Organic Functional Groups onto Solid Supports through Vinylsilane Coupling Reactions. J Am Chem Soc 2010; 132:7268-9. [DOI: 10.1021/ja102741k] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jung-Woo Park
- Department of Chemistry and Center for Bioactive Molecular Hybrids, Yonsei University, Seoul 120-749, Korea
| | - Chul-Ho Jun
- Department of Chemistry and Center for Bioactive Molecular Hybrids, Yonsei University, Seoul 120-749, Korea
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38
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One-pot catalytic C–C double bond cleavage of α,β-enones aided by alkyl group-immobilized silica spheres. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2009.10.103] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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39
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Walaszek B, Yeping X, Adamczyk A, Breitzke H, Pelzer K, Limbach HH, Huang J, Li H, Buntkowsky G. 2H-solid-state-NMR study of hydrogen adsorbed on catalytically active ruthenium coated mesoporous silica materials. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2009; 35:164-171. [PMID: 19359146 DOI: 10.1016/j.ssnmr.2009.02.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2009] [Revised: 02/17/2009] [Accepted: 02/26/2009] [Indexed: 05/27/2023]
Abstract
(2)H solid-state NMR measurements were performed on three samples of ruthenium nanoparticles synthesized inside two different kinds of mesoporous silica, namely SBA-3 silica materials and SBA-15 functionalized with -COOH groups and loaded with deuterium gas. The line-shape analyses of the spectra reveal the different deuteron species. In all samples a strong -OD signal is found, which shows the catalytic activity of the metal, which activates the D-D bond and deuterates the -SiOH groups through the gas phase, corroborating their usability as catalysts for hydrogenation reactions. At room temperature the mobility of the -Si-OD groups depends on the sample preparation. In addition to the -Si-OD deuterons, the presence of different types of deuterons bound to the metal is revealed. The singly coordinated -Ru-D species exhibit several different quadrupolar couplings, which indicate the presence of several non-equivalent binding sites with differing binding strength. In addition to the dissociated hydrogen species there is also a dihydrogen species -Ru-D(2), which is attributed to defect sites on the surface. It exhibits a fast rotational dynamics at all temperatures. Finally there are also indications of three-fold coordinated surface deuterons and octahedrally coordinated deuterons inside the metal.
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Affiliation(s)
- Bernadeta Walaszek
- Institut für Physikalische und Theoretische Chemie, Freie Universität Berlin, Berlin, Germany
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40
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Grellier M, Ayed T, Barthelat JC, Albinati A, Mason S, Vendier L, Coppel Y, Sabo-Etienne S. Versatile Coordination of 2-Pyridinetetramethyldisilazane at Ruthenium: Ru(II) vs Ru(IV) As Evidenced by NMR, X-ray, Neutron, and DFT Studies. J Am Chem Soc 2009; 131:7633-40. [DOI: 10.1021/ja901140v] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mary Grellier
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, F-31077 Toulouse, France, Laboratoire de Physique Quantique, IRSAMC (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 4, France, Department of Structural Chemistry (DCSSI), University of Milan, 21, Via G. Venezian, 20133 Milan, Italy, and Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France
| | - Tahra Ayed
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, F-31077 Toulouse, France, Laboratoire de Physique Quantique, IRSAMC (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 4, France, Department of Structural Chemistry (DCSSI), University of Milan, 21, Via G. Venezian, 20133 Milan, Italy, and Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France
| | - Jean-Claude Barthelat
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, F-31077 Toulouse, France, Laboratoire de Physique Quantique, IRSAMC (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 4, France, Department of Structural Chemistry (DCSSI), University of Milan, 21, Via G. Venezian, 20133 Milan, Italy, and Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France
| | - Alberto Albinati
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, F-31077 Toulouse, France, Laboratoire de Physique Quantique, IRSAMC (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 4, France, Department of Structural Chemistry (DCSSI), University of Milan, 21, Via G. Venezian, 20133 Milan, Italy, and Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France
| | - Sax Mason
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, F-31077 Toulouse, France, Laboratoire de Physique Quantique, IRSAMC (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 4, France, Department of Structural Chemistry (DCSSI), University of Milan, 21, Via G. Venezian, 20133 Milan, Italy, and Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France
| | - Laure Vendier
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, F-31077 Toulouse, France, Laboratoire de Physique Quantique, IRSAMC (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 4, France, Department of Structural Chemistry (DCSSI), University of Milan, 21, Via G. Venezian, 20133 Milan, Italy, and Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France
| | - Yannick Coppel
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, F-31077 Toulouse, France, Laboratoire de Physique Quantique, IRSAMC (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 4, France, Department of Structural Chemistry (DCSSI), University of Milan, 21, Via G. Venezian, 20133 Milan, Italy, and Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France
| | - Sylviane Sabo-Etienne
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, F-31077 Toulouse, France, Laboratoire de Physique Quantique, IRSAMC (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 4, France, Department of Structural Chemistry (DCSSI), University of Milan, 21, Via G. Venezian, 20133 Milan, Italy, and Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France
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41
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Darga A, Kecht J, Bein T. Probing the intrapore surface of phenyl-substituted nanoscale mesoporous silica-piezoelectric sorption measurements in thin films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:12915-12922. [PMID: 18001067 DOI: 10.1021/la701962b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The incorporation of organic moieties into siliceous frameworks leads to a wide variety of adsorbate-adsorbent interactions including weak van-der-Waal attractions as well as strong interactions such as Coulomb forces. Depending on the desired properties of such substituted highly porous matrix materials, optimized synthesis routes can be established to enhance the desired internal pore surface-affinity toward certain volatile compounds. On the basis of a fundamental knowledge of the host-guest system, sorption-related applications may benefit from individually fine-tuned and modified sample materials. The sorption isotherms of vaporized toluene on nonmodified and phenyl-functionalized mesoporous silica samples were determined on an acoustic wave device at different temperatures. The mesoporous silica was modified by in situ co-condensation and postsynthesis grafting approaches, respectively. All samples were thoroughly characterized by nitrogen sorption, thermogravimetric analysis (TGA), scanning and transmission electron microscopy (SEM, TEM), solid-state nuclear magnetic resonance (29Si NMR), dynamic light scattering (DLS), Raman spectroscopy, and toluene adsorption on a quartz crystal microbalance (QCM). The different heats of adsorption of toluene on the various modified silica surfaces obtained by the sorption data make it possible to gain additional information about the degree and type of surface functionalization. It is thus demonstrated that QCM studies can be a powerful and convenient tool for efficient investigations of functionalized mesoporous silica particles that yield valuable quantitative information on molecule-surface interactions.
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Affiliation(s)
- Alexander Darga
- Department of Chemistry and Biochemistry, University of Munich, Butenandtstrasse 5-13 (E), 81377 Munich, Germany
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42
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Park JW, Jun CH. Highly Efficient O-Silylation of Alcohol with Vinylsilane Using a Rh(I)/HCl Catalyst at Room Temperature. Org Lett 2007; 9:4073-6. [PMID: 17824712 DOI: 10.1021/ol701909e] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Highly efficient O-silylation of alcohol with vinylsilane was developed using a catalyst system consisting of [(COE)(2)RhCl](2) and HCl. In this reaction, a key intermediate is chlorosilane, generated from vinylsilane and HCl, which can be regenerated in the catalytic cycle. Various alcohols and vinylsilanes were applied to the preparation of silyl ether compounds with this catalyst system.
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Affiliation(s)
- Jung-Woo Park
- Department of Chemistry and Centre for Bioactive Molecular Hybrid (CBMH), Yonsei University, Seoul 120-749, Korea
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Bartoli G, Fernandez-Bolaños JG, Di Antonio G, Foglia G, Giuli S, Gunnella R, Mancinelli M, Marcantoni E, Paoletti M. SiO2-Supported CeCl3·7H2O−NaI Lewis Acid Promoter: Investigation into the Garcia Gonzalez Reaction in Solvent-Free Conditions⊥. J Org Chem 2007; 72:6029-36. [PMID: 17629331 DOI: 10.1021/jo070384c] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The Knoevenagel condensation of aldose sugars with beta-dicarbonyl compounds produces furan derivatives having polyhydroxyalkylated alkyl side chains; this reaction is known as the Garcia Gonzalez reaction. Despite the fact that these polyhydroxyalkyl furans are interesting scaffolds for synthetic chemists to utilize in the synthesis of a variety of biologically interesting molecules, the reported approach suffers from harsh conditions. The development of a general and more efficient protocol is of considerable importance, and in this manuscript, we wish to explore the role of the NaI in enhancing the activity of CeCl3.7H2O as a useful water-tolerant Lewis acid promoter for the Garcia Gonzalez reaction. The procedure proceeds with good yields at 50 degrees C using our system supported on SiO2 in solvent-free conditions and represents a simple and convenient methodology for the preparation of densely functionalized molecules. Furthermore, the first qualitative results obtained on mechanistic investigation on the role of iodide on this our heterogeneous reaction may be of value for optimization of existing organic transformations and for the development of new ones.
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Affiliation(s)
- Giuseppe Bartoli
- Dipartimento di Scienze Chimiche, Università di Camerino, via S. Agostino 1, I-62032 Camerino (MC), Italy
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44
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Gao D, Zhang Z, Wu M, Xie C, Guan G, Wang D. A surface functional monomer-directing strategy for highly dense imprinting of TNT at surface of silica nanoparticles. J Am Chem Soc 2007; 129:7859-66. [PMID: 17550249 DOI: 10.1021/ja070975k] [Citation(s) in RCA: 496] [Impact Index Per Article: 29.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper reports a surface functional monomer-directing strategy for the highly dense imprinting of 2,4,6-trinitrotoluene (TNT) molecules at the surface of silica nanoparticles. It has been demonstrated that the vinyl functional monomer layer of the silica surface can not only direct the selective occurrence of imprinting polymerization at the surface of silica through the copolymerization of vinyl end groups with functional monomers, but also drive TNT templates into the formed polymer shells through the charge-transfer complexing interactions between TNT and the functional monomer layer. The two basic processes lead to the formation of uniform core-shell TNT-imprinted nanoparticles with a controllable shell thickness and a high density of effective recognition sites. The high capacity and fast kinetics to uptake TNT molecules show that the density of effective imprinted sites in the nanoshells is nearly 5 times that of traditional imprinted particles. A critical value of shell thickness for the maximum rebinding capacity was determined by testing the evolution of rebinding capacity with shell thickness, which provides new insights into the effectiveness of molecular imprinting and the form of imprinted materials. These results reported here not only can find many applications in molecularly imprinting techniques but also can form the basis of a new strategy for preparing various polymer-coating layers on silica support.
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Affiliation(s)
- Daming Gao
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China
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45
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Liang Y, Anwander R. Disilazane functionalization of large-pore hybrid periodic mesoporous organosilicas. ACTA ACUST UNITED AC 2007. [DOI: 10.1039/b700545h] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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