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Fayaz I, Ganaie NB, Peerzada GM. Synthesis of bromoepoxy/zirconium phosphate (ZrP) metalloresin by ultrasonication and exploring its applications. Polym Bull (Berl) 2023. [DOI: 10.1007/s00289-023-04744-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
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2
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Pica M, Caroni J, D'Amato R, Gatti G, Paul G, Nocchetti M. Mixed Zirconium Phosphate Bis-Phosphonomethyl Glycine from Nanocrystalline α-Zirconium Phosphate: A Tailored Suite for Gold Nanoparticles. Inorg Chem 2023; 62:1394-1404. [PMID: 36653931 DOI: 10.1021/acs.inorgchem.2c03418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A novel synthetic approach was investigated for the preparation of nanoplatelets of mixed zirconium phosphate bis-phosphonomethyl glycine, ZPGly, by the reaction of a gel of nanocrystalline α-type zirconium phosphate with N,N-bis-phosphonomethyl glycine, H3Gly. The syntheses were carried out in the absence of hydrofluoric acid by changing both the reagent relative amounts and temperature. An H3Gly/Zr molar ratio >2 did not significantly improve the degree of crystallinity of the materials, while an increase of temperature from 80 °C to 120 °C improved the crystallinity; the best result was obtained with H3Gly/Zr molar ratio = 2 and with a temperature reaction of 120 °C. The sample consisted of nanoplatelets with the size in the range 20-40 nm, and it was successfully exfoliated by treatment with a solution of methylamine. By treatment of the ZPGly colloidal dispersions with HAuCl4, a color change from white to red-violet was observed, indicating the formation of gold nanoparticles. The size and morphology of the gold particles were affected by the degree of crystallinity and, in turn, by the composition of the ZPGly support. As a matter of fact, large micrometric Au particles with a cubo-octahedral morphology were obtained by using the less crystalline ZPGly_R2-80 sample, while interconnected Au particles, with a size of about 16 nm, were obtained by using ZPGly_R2-120. The samples exhibited an absorption maximum in the visible region due to the surface plasmon resonance of gold nanoparticles.
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Affiliation(s)
- Monica Pica
- Department of Pharmaceutical Sciences, University of Perugia, Via Del Liceo, 1, Perugia06123, Italy
| | - Jonathan Caroni
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via Elce di Sotto, 8, Perugia06123, Italy
| | - Roberto D'Amato
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via Elce di Sotto, 8, Perugia06123, Italy
| | - Giorgio Gatti
- Department for the Sustainable Development and Ecological Transition, University of Eastern Piedmont, Piazza Sant'Eusebio 5, Vercelli13100, Italy
| | - Geo Paul
- Department of Sciences and Technological Innovation, University of Eastern Piedmont "A. Avogadro", Viale T. Michel 11, Alessandria15121, Italy
| | - Morena Nocchetti
- Department of Pharmaceutical Sciences, University of Perugia, Via Del Liceo, 1, Perugia06123, Italy
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3
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Shekh A, Mombeni Goodajdar B, Asghariganjeh MR. Three-Component Solvent-Free Synthesis of 3, 4-Dihydropyrimidones and Thiones by Iron-Phosphonate Nanoparticle. Polycycl Aromat Compd 2022. [DOI: 10.1080/10406638.2021.1948875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Asma Shekh
- Department of Chemistry, Omidiyeh Branch, Islamic Azad University, Omidiyeh, Iran
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Arpanahi F, Mombeni Goodajdar B. Iron–Phosphonate Nanomaterial: As a Novel and Efficient Organic–Inorganic Hybrid Catalyst for Solvent-Free Synthesis of Tri-Substituted Imidazole Derivatives. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-020-01530-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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5
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Kopecká K, Melánová K, Beneš L, Knotek P, Mazur M, Zima V. Exfoliation of layered mixed zirconium 4-sulfophenylphosphonate phenylphosphonates. Dalton Trans 2020; 49:3816-3823. [PMID: 31830166 DOI: 10.1039/c9dt03883c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Mixed zirconium 4-sulfophenylphosphonate phenylphosphonates with formulae Zr(HO3SC6H4PO3)1.8(C6H5PO3)0.2·2.6H2O, Zr(HO3SC6H4PO3)1.3(C6H5PO3)0.7·2H2O, and Zr(HO3SC6H4PO3)0.7(C6H5PO3)1.3·3.6H2O (generally, ZrSPhP) were intercalated with a series of amino alcohols, H2N(CH2)nOH, where n = 2 to 6, and triethylamine. It was found that in the case of amino alcohols the basal spacing of the intercalates increases linearly with n. The intercalates prepared can be exfoliated either by sonication or by the action of high-shear forces. The use of a high-shear force disperser is a more efficient exfoliation method, as it provides lamellas with larger lateral dimensions in a much shorter time. It was found that amino alcohols provide roughly the same results regardless of the length of their carbon chain. As follows from atomic force microscopy measurements, triethylamine is the most appropriate exfoliation agent for ZrSPhP as it produces platelets with the largest lateral size and the lowest amount of defects.
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Affiliation(s)
- Katerina Kopecká
- Joint Laboratory of Solid State Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 84, 532 10 Pardubice, Czech Republic. and Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic
| | - Klara Melánová
- Joint Laboratory of Solid State Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 84, 532 10 Pardubice, Czech Republic. and Institute of Macromolecular Chemistry of the Czech Academy of Sciences, Heyrovského nám. 2, 162 06 Prague 6, Czech Republic
| | - Ludvik Beneš
- Joint Laboratory of Solid State Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 84, 532 10 Pardubice, Czech Republic.
| | - Petr Knotek
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic
| | - Michal Mazur
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43 Prague 2, Czech Republic
| | - Vitezslav Zima
- Institute of Macromolecular Chemistry of the Czech Academy of Sciences, Heyrovského nám. 2, 162 06 Prague 6, Czech Republic
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7
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Abstract
In September 2018, the First European Workshop on Metal Phosphonates Chemistry brought together some prominent researchers in the field of metal phosphonates and phosphinates with the aim of discussing past and current research efforts and identifying future directions. The scope of this perspective article is to provide a critical overview of the topics discussed during the workshop, which are divided into two main areas: synthesis and characterisation, and applications. In terms of synthetic methods, there has been a push towards cleaner and more efficient approaches. This has led to the introduction of high-throughput synthesis and mechanochemical synthesis. The recent success of metal–organic frameworks has also promoted renewed interest in the synthesis of porous metal phosphonates and phosphinates. Regarding characterisation, the main advances are the development of electron diffraction as a tool for crystal structure determination and the deployment of in situ characterisation techniques, which have allowed for a better understanding of reaction pathways. In terms of applications, metal phosphonates have been found to be suitable materials for several purposes: they have been employed as heterogeneous catalysts for the synthesis of fine chemicals, as solid sorbents for gas separation, notably CO2 capture, as materials for electrochemical devices, such as fuel cells and rechargeable batteries, and as matrices for drug delivery.
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8
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Melánová K, Beneš L, Svoboda J, Zima V, Pospíšil M, Kovář P. Alkaline-earth metal phenylphosphonates and their intercalation chemistry. Dalton Trans 2018; 47:2867-2880. [PMID: 29340415 DOI: 10.1039/c7dt03728g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The intercalation chemistry of layered alkaline-earth metal phenylphosphonates with the general formula MeC6H5PO3·2H2O (Ca, Sr, Ba) is reviewed. The preparation of the host materials is described and their behavior in dependence on the relative humidity and pH of the reaction medium is discussed. Mutual relationships between MeC6H5PO3·2H2O and Me(C6H5PO3H)2 were investigated using a method of computer-controlled addition of reagents. The MeC6H5PO3·2H2O compounds are able to intercalate species having a free electron pair through the so-called coordination intercalation. In this way, 1-alkylamines, 1-alkanols, 1,n-diols and 1,2-diols were intercalated. In the case of the ethanol and methanol intercalates of strontium phenylphosphonate we were able to determine the structure of the host part by single-crystal X-ray diffraction. By combination of the data obtained from the diffraction with molecular modeling we suggested the arrangement of the host molecules in the interlayer space of the host. The arrangement of the shorter diols in the interlayer space of strontium phenylphosphonate was also proposed on the basis of molecular modeling calculations. These models help us to understand the structure of the prepared intercalates.
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Affiliation(s)
- Klára Melánová
- Institute of Macromolecular Chemistry of Academy of Sciences of the Czech Republic, Heyrovský Sq. 2, 162 06 Prague 6, Czech Republic.
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9
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Wang J, Wang R, Zi H, Wang H, Xia Y, Liu X. Porous Organic Zirconium Phosphonate as Efficient Catalysts for the Catalytic Transfer Hydrogenation of Ethyl Levulinate to γ-Valerolactone without External Hydrogen. J CHIN CHEM SOC-TAIP 2018. [DOI: 10.1002/jccs.201700309] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jianjia Wang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering; Jiangnan University; Wuxi Jiangsu 214122 China
| | - Ruiying Wang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering; Jiangnan University; Wuxi Jiangsu 214122 China
| | - Huimin Zi
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering; Jiangnan University; Wuxi Jiangsu 214122 China
| | - Haijun Wang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering; Jiangnan University; Wuxi Jiangsu 214122 China
| | - Yongmei Xia
- State Key Laboratory of Food Science & Technology; Wuxi Jiangsu, 214122 China
| | - Xiang Liu
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering; Jiangnan University; Wuxi Jiangsu 214122 China
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Ballesteros-Plata D, Infantes-Molina A, Rodríguez-Aguado E, Braos-García P, Rodríguez-Castellón E. Lamellar zirconium phosphates to host metals for catalytic purposes. Dalton Trans 2018; 47:3047-3058. [DOI: 10.1039/c7dt03717a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the present study a porous lamellar zirconium phosphate heterostructure (PPH) formed from zirconium(iv) phosphate expanded with silica galleries (P/Zr molar ratio equal to 2 and (Si + Zr)/P equal to 3) was prepared to host noble metals.
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Affiliation(s)
- Daniel Ballesteros-Plata
- Departamento de Química Inorgánica
- Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC)
- Facultad de Ciencias
- Universidad de Málaga
- 29071 Málaga
| | - Antonia Infantes-Molina
- Departamento de Química Inorgánica
- Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC)
- Facultad de Ciencias
- Universidad de Málaga
- 29071 Málaga
| | - Elena Rodríguez-Aguado
- Departamento de Química Inorgánica
- Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC)
- Facultad de Ciencias
- Universidad de Málaga
- 29071 Málaga
| | - Pilar Braos-García
- Departamento de Química Inorgánica
- Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC)
- Facultad de Ciencias
- Universidad de Málaga
- 29071 Málaga
| | - Enrique Rodríguez-Castellón
- Departamento de Química Inorgánica
- Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC)
- Facultad de Ciencias
- Universidad de Málaga
- 29071 Málaga
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11
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Taddei M, Sassi P, Costantino F, Vivani R. Amino-Functionalized Layered Crystalline Zirconium Phosphonates: Synthesis, Crystal Structure, and Spectroscopic Characterization. Inorg Chem 2016; 55:6278-85. [DOI: 10.1021/acs.inorgchem.6b00943] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marco Taddei
- Laboratory
for Catalysis and Sustainable Chemistry, Paul Scherrer Institute, 5232 Villigen-PSI, Villigen, Switzerland
| | - Paola Sassi
- Department of Chemistry Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Ferdinando Costantino
- Department of Chemistry Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Riccardo Vivani
- Department of Pharmaceutical Sciences, University of Perugia, Via del Liceo 1, 06123 Perugia, Italy
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12
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Petrucci C, Cappelletti M, Piermatti O, Nocchetti M, Pica M, Pizzo F, Vaccaro L. Immobilized palladium nanoparticles on potassium zirconium phosphate as an efficient recoverable heterogeneous catalyst for a clean Heck reaction in flow. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcata.2015.02.012] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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13
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Stevanović D, Pejović A, Damljanović I, Minić A, Bogdanović GA, Vukićević M, Radulović NS, Vukićević RD. Ferrier rearrangement promoted by an electrochemically generated zirconium catalyst. Carbohydr Res 2015; 407:111-21. [DOI: 10.1016/j.carres.2015.02.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 01/26/2015] [Accepted: 02/05/2015] [Indexed: 10/24/2022]
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14
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Lin XZ, Ren TZ, Yuan ZY. Mesoporous zirconium phosphonate materials as efficient water-tolerable solid acid catalysts. Catal Sci Technol 2015. [DOI: 10.1039/c4cy01110d] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mesoporous zirconium phosphonate materials were fabricated as efficient water-tolerable solid acid catalysts.
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Affiliation(s)
- Xiu-Zhen Lin
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Tie-Zhen Ren
- School of Chemical Engineering and Technology
- Hebei University of Technology
- Tianjin 300130
- China
| | - Zhong-Yong Yuan
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- College of Chemistry
- Nankai University
- Tianjin 300071
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15
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New ferrocene containing 3-(arylthio)propan-1-ones: Synthesis, spectral characterization and crystal structure of 3-[(4-chlorophenyl)thio]-1-ferrocenylpropan-1-one, 3-[(4-chlorophenyl)thio]-1-ferrocenyl-3-phenylpropan-1-one and 3-[(4-chlorophenyl)thio]-3-ferrocenyl-1-phenylpropan-1-one. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.12.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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16
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Wang Y, Xue C, Li X, Du X, Wang Z, Ma G, Hao X. Facile Preparation of α-Zirconium Phosphate/Polyaniline Hybrid Film for Detecting Potassium Ion in a Wide Linear Range. ELECTROANAL 2014. [DOI: 10.1002/elan.201300623] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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17
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Pica M, Donnadio A, D’Amato R, Capitani D, Taddei M, Casciola M. Layered Metal(IV) Phosphonates with Rigid Pendant Groups: New Synthetic Approaches to Nanosized Zirconium Phosphate Phenylphosphonates. Inorg Chem 2014; 53:2222-9. [DOI: 10.1021/ic402884g] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Monica Pica
- Department of Chemistry, Perugia University, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Anna Donnadio
- Department of Chemistry, Perugia University, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Roberto D’Amato
- Department of Chemistry, Perugia University, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Donatella Capitani
- Istituto di Metodologie
Chimiche, Laboratorio di Risonanza Magnetica “Annalaura Segre”, CNR, Via Salaria km 29.300, 00016 Monterotondo Scalo (RM), Italy
| | - Marco Taddei
- Department of Chemistry, Perugia University, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Mario Casciola
- Department of Chemistry, Perugia University, Via Elce di Sotto 8, 06123 Perugia, Italy
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18
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Angeloni M, Piermatti O, Pizzo F, Vaccaro L. Synthesis of Zirconium Phosphonate SupportedL-Proline as an Effective Organocatalyst for Direct Asymmetric Aldol Addition. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301673] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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19
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Horie T, Akao S, Suzuki T, Tanaka K, Jia N, Taniya K, Nishiyama S, Ohmura N. Process Development for Ultrasonic Fracturing of Zirconium Phosphate Particles. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2014. [DOI: 10.1252/jcej.13we087] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Takafumi Horie
- Department of Chemical Science and Engineering, Kobe University
| | - Shinsuke Akao
- Process Technology & Research Group, Process Technology Laboratories, KANEKA CORPORATION
| | - Takayuki Suzuki
- Department of Chemical Science and Engineering, Kobe University
| | - Koki Tanaka
- Department of Chemical Science and Engineering, Kobe University
| | - Ning Jia
- Department of Chemical Science and Engineering, Kobe University
| | - Keita Taniya
- Department of Chemical Science and Engineering, Kobe University
| | | | - Naoto Ohmura
- Department of Chemical Science and Engineering, Kobe University
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20
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Svoboda J, Zima V, Melánová K, Beneš L, Trchová M. Intercalation chemistry of zirconium 4-sulfophenylphosphonate. J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2013.09.042] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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21
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Taddei M, Donnadio A, Costantino F, Vivani R, Casciola M. Synthesis, Crystal Structure, and Proton Conductivity of One-Dimensional, Two-Dimensional, and Three-Dimensional Zirconium Phosphonates Based on Glyphosate and Glyphosine. Inorg Chem 2013; 52:12131-9. [DOI: 10.1021/ic4019597] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marco Taddei
- Dipartimento di Chimica, Università di Perugia, Via Elce
di Sotto 8, 06123 Perugia, Italy
| | - Anna Donnadio
- Dipartimento di Chimica, Università di Perugia, Via Elce
di Sotto 8, 06123 Perugia, Italy
| | - Ferdinando Costantino
- Dipartimento di Chimica, Università di Perugia, Via Elce
di Sotto 8, 06123 Perugia, Italy
| | - Riccardo Vivani
- Dipartimento di Chimica, Università di Perugia, Via Elce
di Sotto 8, 06123 Perugia, Italy
| | - Mario Casciola
- Dipartimento di Chimica, Università di Perugia, Via Elce
di Sotto 8, 06123 Perugia, Italy
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22
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Pica M, Donnadio A, Troni E, Capitani D, Casciola M. Looking for New Hybrid Polymer Fillers: Synthesis of Nanosized α-Type Zr(IV) Organophosphonates through an Unconventional Topotactic Anion Exchange Reaction. Inorg Chem 2013; 52:7680-7. [DOI: 10.1021/ic400834d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Monica Pica
- Department of Chemistry, Perugia University, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Anna Donnadio
- Department of Chemistry, Perugia University, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Elisabetta Troni
- Department of Chemistry, Perugia University, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Donatella Capitani
- Laboratorio di Risonanza Magnetica “Annalaura
Segre”, Istituto di Metodologie Chimiche, CNR, Via Salaria km 29.300, 00016 Monterotondo Scalo (RM), Italy
| | - Mario Casciola
- Department of Chemistry, Perugia University, Via Elce di Sotto 8, 06123 Perugia, Italy
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23
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Taylor-Pashow KML, Shehee TC, Hobbs DT. Advances in Inorganic and Hybrid Ion Exchangers. SOLVENT EXTRACTION AND ION EXCHANGE 2013. [DOI: 10.1080/07366299.2012.735510] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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24
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Taddei M, Vivani R, Costantino F. On the role of non-covalent interactions in the assembly of 3D zirconium methyl- and ethyl-N,N-bis phosphonates. Dalton Trans 2013; 42:9671-8. [DOI: 10.1039/c3dt50400j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Ferrier Rearrangement and 2-Deoxy Sugar Synthesis from d-Glycals Mediated by Layered α-Zirconium Sulfophenylphosphonate-Methanphosphonate as Heterogeneous Catalyst. Catal Letters 2012. [DOI: 10.1007/s10562-012-0932-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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26
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Stevanović D, Pejović A, Damljanović I, Vukićević M, Bogdanović GA, Vukićević RD. Anodic generation of a zirconium catalyst for Ferrier rearrangement and hetero Michael addition. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.09.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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27
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Biswas RK, Habib MA, Karmakar AK, Islam MR. Preparation of Some Useful Compounds of Zirconium from Bangladeshi Zircon. Ind Eng Chem Res 2012. [DOI: 10.1021/ie301412b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ranjit K. Biswas
- Department of Applied Chemistry and Chemical Engineering, Rajshahi University, Rajshahi-6205, Bangladesh
| | - Mohammad A. Habib
- Department of Applied Chemistry and Chemical Engineering, Rajshahi University, Rajshahi-6205, Bangladesh
| | - Aneek K. Karmakar
- Department of Applied Chemistry and Chemical Engineering, Rajshahi University, Rajshahi-6205, Bangladesh
| | - Mohammad R. Islam
- Department of Applied Chemistry and Chemical Engineering, Rajshahi University, Rajshahi-6205, Bangladesh
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28
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Zhou L. Studies on the Synthesis of a Chiral Salen Mn (III) Complex Immobilised onto Zirconium Aminophosphonates and Catalytic Asymmetric Epoxidation of α–methylstyrene. JOURNAL OF CHEMICAL RESEARCH 2012. [DOI: 10.3184/174751912x13408679046933] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A chiral salen Mn (III) complex has been immobilised onto zirconium aminophosphonates by axial coordination with different linkage arm lengths (CH2) n ( n = 2–6), to give a series of heterogeneous catalysts. The catalysts exhibited good to excellent catalytic efficiency in the asymmetric epoxidation of α–methylstyrene. One heterogeneous catalyst, with n = 6, gave higher catalytic properties than the original chiral salen Mn (III) complex in the NaClO/PPNO system. It can be easily recovered and reused several times without significant loss of activity.
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Affiliation(s)
- Liang Zhou
- College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, P. R. China
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Oxidation of cyclohexene catalyzed by Cu(Salen) intercalated α-zirconium phosphate using dry tert-butylhydroperoxide. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcata.2011.11.017] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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30
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Ishida Y, Sakata H, Achalkumar AS, Yamada K, Matsuoka Y, Iwahashi N, Amano S, Saigo K. Guest-Responsive Covalent Frameworks by the Cross-Linking of Liquid-Crystalline Salts: Tuning of Lattice Flexibility by the Design of Polymerizable Units. Chemistry 2011; 17:14752-62. [DOI: 10.1002/chem.201102422] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Indexed: 11/08/2022]
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31
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Calogero S, Lanari D, Orrù M, Piermatti O, Pizzo F, Vaccaro L. Supported l-proline on zirconium phosphates methyl and/or phenyl phosphonates as heterogeneous organocatalysts for direct asymmetric aldol addition. J Catal 2011. [DOI: 10.1016/j.jcat.2011.06.004] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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32
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Rosati O, Curini M, Montanari F, Nocchetti M, Genovese S. α-Zirconium Sulfophenylphosphonate as a Catalyst for the Synthesis of 3,4-Dihydropyrimidin-2(1H)-One Derivatives Under Solvent Free Conditions. Catal Letters 2011. [DOI: 10.1007/s10562-011-0604-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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33
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Beneš L, Melánová K, Svoboda J, Zima V, Růžička A, Trchová M. Strontium Methylphosphonate Trihydrate: An Example of a New Class of Host Materials for Intercalation Reactions – Synthesis, Structure and Intercalation Behavior. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201001035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ludvík Beneš
- Faculty of Chemical Technology, University of Pardubice, 53210 Pardubice, Czech Republic
- Present address: Joint Laboratory of Solid State Chemistry of Institute of Macromolecular Chemistry of the Academy of Sciences of the Czech Republic v.v.i. and the University of Pardubice, 53210 Pardubice, Czech Republic
| | - Klára Melánová
- Institute of Macromolecular Chemistry of the Academy ofSciences of the Czech Republic v.v.i., Heyrovsky sq. 2, 12006 Prague, Czech Republic, Fax: +420‐466‐036‐011
- Present address: Joint Laboratory of Solid State Chemistry of Institute of Macromolecular Chemistry of the Academy of Sciences of the Czech Republic v.v.i. and the University of Pardubice, 53210 Pardubice, Czech Republic
| | - Jan Svoboda
- Institute of Macromolecular Chemistry of the Academy ofSciences of the Czech Republic v.v.i., Heyrovsky sq. 2, 12006 Prague, Czech Republic, Fax: +420‐466‐036‐011
- Present address: Joint Laboratory of Solid State Chemistry of Institute of Macromolecular Chemistry of the Academy of Sciences of the Czech Republic v.v.i. and the University of Pardubice, 53210 Pardubice, Czech Republic
| | - Vítězslav Zima
- Institute of Macromolecular Chemistry of the Academy ofSciences of the Czech Republic v.v.i., Heyrovsky sq. 2, 12006 Prague, Czech Republic, Fax: +420‐466‐036‐011
- Present address: Joint Laboratory of Solid State Chemistry of Institute of Macromolecular Chemistry of the Academy of Sciences of the Czech Republic v.v.i. and the University of Pardubice, 53210 Pardubice, Czech Republic
| | - Aleš Růžička
- Faculty of Chemical Technology, University of Pardubice, 53210 Pardubice, Czech Republic
| | - Miroslava Trchová
- Institute of Macromolecular Chemistry of the Academy ofSciences of the Czech Republic v.v.i., Heyrovsky sq. 2, 12006 Prague, Czech Republic, Fax: +420‐466‐036‐011
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Rocha GMSRO, Santos TM, Bispo CSS. Study of Selectivity of Metal Phosphates and Phosphonates in Baeyer–Villiger Oxidations. Catal Letters 2010. [DOI: 10.1007/s10562-010-0481-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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35
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Barber P, Pellechia PJ, Ploehn HJ, zur Loye HC. High-dielectric polymer composite materials from a series of mixed-metal phenylphosphonates, ATi(C6H5PO3)3 for dielectric energy storage. ACS APPLIED MATERIALS & INTERFACES 2010; 2:2553-2559. [PMID: 20804129 DOI: 10.1021/am1003987] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We report the preparation of new polymer composite dielectric materials for energy storage applications. New layered 1:1 mixed A+2/Ti4+ metal phenylphosphonates, ATi(O3PC6H5)3, A=Mg, Ca, Sr, Ba, and Pb, have been prepared via a melt route, in which mixed metal oxides, ATiO3, were reacted with molten phenyl phosphonic acid. The mixed-metal phosphonates were combined with polystyrene (PS) via a solution route and cast as thin films for dielectric permittivity measurements. The ATi(O3PC6H5)3-PS composites exhibit a substantial enhancement in the dielectric permittivity as a function of weight loading relative to the parent ATiO3-PS composites. For both ATiO3-PS and ATi(O3PC6H5)3-PS, the composites' dielectric permittivity increases with A cation polarizability. Unusually large increases for 40 wt% ATi(O3PC6H5)3-PS composites (A=Sr, Ba, and Pb) indicate permittivity enhancement that goes beyond the effect of varying filler composition.
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Affiliation(s)
- Peter Barber
- Department of Chemistry and Biochemistry, University of South Carolina, South Carolina 29208, USA
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37
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Bellezza F, Cipiciani A, Costantino U, Fringuelli F, Orrù M, Piermatti O, Pizzo F. Aza-Diels–Alder reaction of Danishefsky's diene with immines catalyzed by porous α-zirconium hydrogen phosphate and SDS under solvent-free conditions. Catal Today 2010. [DOI: 10.1016/j.cattod.2009.07.105] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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38
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Synthesis and characterization of mesoporous zirconium phosphonates: A novel supported cinchona alkaloid catalysts in asymmetric catalysis. CATAL COMMUN 2010. [DOI: 10.1016/j.catcom.2009.10.031] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Tian X, He W, Cui J, Zhang X, Zhou W, Yan S, Sun X, Han X, Han S, Yue Y. Mesoporous zirconium phosphate from yeast biotemplate. J Colloid Interface Sci 2009; 343:344-9. [PMID: 20031146 DOI: 10.1016/j.jcis.2009.11.037] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2009] [Revised: 10/31/2009] [Accepted: 11/18/2009] [Indexed: 10/20/2022]
Abstract
Mesoporous zirconium phosphate has attracted increasing interest due to its extraordinary functionalities. In particular, great progress has been made in the synthesis of mesoporous zirconium phosphate using traditional approaches. However, synthesis of mesoporous zirconium phosphate using yeast as biotemplate has not been well studied so far. Here, we show that zirconium phosphate with a mesoporous structure has been synthesized under ambient conditions using yeast as biotemplate. The derived samples were examined by X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), thermogravimetry/differential thermal analysis (TG/DTA), fourier transform infrared spectroscopy (FTIR), and N(2) adsorption-desorption isotherms. A biotemplated mesoporous zirconium phosphate, possessing a specific surface area (Brunauer-Emmett-Teller, BET) of 217.64 m(2) g(-1), a narrow pore distribution centered at 2.7 nm, and pore volume of 0.24 cm(3) g(-1), was obtained. We discover that amide carboxyl groups of yeast play an important role in the chemical interaction between protein molecules and zirconium phosphate nanoparticles. Interestingly, an air electrode fabricated using mesoporous zirconium phosphate exhibits remarkable electrocatalytic activity for oxygen reduction reaction (ORR), compared to that of the electrolytic manganese dioxide (EMD) air electrode employed commercially, which has important applications in fuel cell technologies.
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Affiliation(s)
- Xiuying Tian
- Shandong Key Laboratory of Glass and Ceramic, School of Materials Science and Engineering, Shandong Institute of Light Industry, Jinan 250353, People's Republic of China
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40
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Sun L, O'Reilly J, Kong D, Su J, Boo W, Sue HJ, Clearfield A. The effect of guest molecular architecture and host crystallinity upon the mechanism of the intercalation reaction. J Colloid Interface Sci 2009; 333:503-9. [DOI: 10.1016/j.jcis.2009.02.028] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2008] [Revised: 02/12/2009] [Accepted: 02/12/2009] [Indexed: 11/28/2022]
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41
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Costantino U, Fringuelli F, Orrù M, Nocchetti M, Piermatti O, Pizzo F. Direct Aza-Diels-Alder Reaction in Water Catalyzed by Layered α-Zirconium Hydrogen Phosphate and Sodium Dodecyl Sulfate. European J Org Chem 2009. [DOI: 10.1002/ejoc.200801132] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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42
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Ma X, Liu J, Xiao L, Chen R, Zhou J, Fu X. Novel organosoluble filiform zirconium phosphonates with a layered mesoporous backbone. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b816542d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Affiliation(s)
- Zheng Wang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, China
| | - Gang Chen
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, China
| | - Kuiling Ding
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, China
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44
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Clearfield A. Unconventional metal organic frameworks: porous cross-linked phosphonates. Dalton Trans 2008:6089-102. [PMID: 18985237 DOI: 10.1039/b807676f] [Citation(s) in RCA: 131] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The past decade has witnessed an exponential growth of metal organic framework compounds (MOFs). The defining character of these compounds is their porosity. However, in many cases no effort was made to show evidence that a stable porous structure has been achieved and that the pores may be accessed. In the present paper we describe recent work on porous pillared zirconium diphosphonates, and the newer and in many respects different characteristics of tin(iv) phosphonates. The Sn(IV) monophosphonates form spherical globules that exhibit very high surface areas. The surface area arises from their nano-sized particles that pack in a "house of cards" arrangement. Also, it is shown that the 1,4-monophenyldiphosphonic acid forms highly porous (250-400 m2 g(-1)) materials with Sn(IV) when prepared in alcohol-water media. This is not the case with analogous Zr(IV) compounds. The many variations in the syntheses of both the zirconium and tin aryl- and alkyldiphosphonate pillars and their combinations with spacers such as methyl- and monophenylphosphonic acid have created a variety of highly porous materials that are stable to 400 degrees C in air, highly stable in acid media, do not collapse when de-solvated, and can be post and presynthesis altered to include functional groups. Several new directions taken by other researchers are also described. However, it is emphasized in this presentation that the cross-linked compounds form particles that precipitate rapidly into nanoparticles that exhibit only short range order. Therefore, they differ from the more conventional MOFs in that they are not amenable to structure solution by X-ray or neutron diffraction techniques. Rather, they must be understood on the basis of modeling and indirect data from EM, NMR, and additional spectroscopic and textural studies.
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Affiliation(s)
- Abraham Clearfield
- Department of Chemistry, Texas A & M University, College Station, Texas 77842-3012, USA
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45
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Salvadó MA, Pertierra P, Castro GR, Trobajo C, García JR. Synthesis and Crystal Structure of Thorium Bis(hydrogenphosphate) Monohydrate. Inorg Chem 2008; 47:1246-8. [DOI: 10.1021/ic702497x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Miguel A. Salvadó
- Departamentos de Química Física y Analítica y Química Orgánica e Inorgánica, Universidad de Oviedo, 33006 Oviedo, Spain, and SpLine, Spanish CRG Beamline, ESRF, BP 220, F-38043 Grenoble Cedex, France
| | - Pilar Pertierra
- Departamentos de Química Física y Analítica y Química Orgánica e Inorgánica, Universidad de Oviedo, 33006 Oviedo, Spain, and SpLine, Spanish CRG Beamline, ESRF, BP 220, F-38043 Grenoble Cedex, France
| | - Germán R. Castro
- Departamentos de Química Física y Analítica y Química Orgánica e Inorgánica, Universidad de Oviedo, 33006 Oviedo, Spain, and SpLine, Spanish CRG Beamline, ESRF, BP 220, F-38043 Grenoble Cedex, France
| | - Camino Trobajo
- Departamentos de Química Física y Analítica y Química Orgánica e Inorgánica, Universidad de Oviedo, 33006 Oviedo, Spain, and SpLine, Spanish CRG Beamline, ESRF, BP 220, F-38043 Grenoble Cedex, France
| | - José R. García
- Departamentos de Química Física y Analítica y Química Orgánica e Inorgánica, Universidad de Oviedo, 33006 Oviedo, Spain, and SpLine, Spanish CRG Beamline, ESRF, BP 220, F-38043 Grenoble Cedex, France
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46
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Tae Jeong Y, Amirthaganesan S, Aridoss G, Hwan Park Y, Su Kim J, Mo Son S. A Facile Synthesis of 4-Aryl-5-alkoxycarbonyl- 6-hydroxy-6-methyl-4,5,6,7-tetrahydro- 3-hydroxy-2-(pyridin-2-yl)indazoles and Their NMR Characterizations. HETEROCYCLES 2008. [DOI: 10.3987/com-07-11231] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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47
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Rosati O, Curini M, Marcotullio MC, Macchiarulo A, Perfumi M, Mattioli L, Rismondo F, Cravotto G. Synthesis, docking studies and anti-inflammatory activity of 4,5,6,7-tetrahydro-2H-indazole derivatives. Bioorg Med Chem 2007; 15:3463-73. [PMID: 17382550 DOI: 10.1016/j.bmc.2007.03.006] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2006] [Revised: 02/28/2007] [Accepted: 03/02/2007] [Indexed: 11/20/2022]
Abstract
A regioselective synthesis of 2,3-disubstituted tetrahydro-2H-indazols, mediated by alpha-zirconium sulfophenylphosphonate-methanephosphonate, was reported. Docking studies into the catalytic site of COX-2 were used to identify potential anti-inflammatory lead compounds. Two lead derivatives were chosen endowed with good binding energies and good ADME profiling. The biological in vivo evaluation of these compounds in two different experimental models (Freund's adjuvant-induced arthritis and carrageenan-induced oedema) proved the presence of anti-inflammatory activity. Noteworthy, both compounds evidenced the lack of any gastric injury even at high doses in gastric ulcerogenic assays.
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Affiliation(s)
- Ornelio Rosati
- Dipartimento di Chimica e Tecnologia del Farmaco, Via del liceo 1, University of Perugia, 06123 Perugia (PG), Italy.
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Takas NJ, Aitken JA. Phase Transitions and Second-Harmonic Generation in Sodium Monothiophosphate. Inorg Chem 2006; 45:2779-81. [PMID: 16562933 DOI: 10.1021/ic0520216] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Oxythiophosphate compounds, which contain anions comprised of oxidized phosphorus bound to oxygen and sulfur, are scarce and, in general, poorly characterized. Although alpha-Na3PO3S has been known for over 60 years, little has been revealed about this compound. Here we present thermal analysis and second-harmonic-generation (SHG) efficiency of alpha-Na3PO3S. Details about its transformation to the high-temperature beta phase are discussed. Under vacuum, alpha-Na3PO3S undergoes one endothermic event at 553 degrees C upon heating and two exothermic events at 504 and 467 degrees C upon cooling. beta-Na3PO3S can be trapped upon quenching Na3PO3S from high temperature. We have observed that the beta phase converts back to the alpha phase at room temperature. Interestingly, relative humidity has been determined to catalyze this phase transformation. alpha-Na3PO3S oxidizes at 315 degrees C in air to produce Na4P2O7 and Na2SO4. Upon exposure to 1064-nm incident radiation, noncentrosymmetric alpha-Na3PO3S produces an SHG efficiency 200 times that of alpha-quartz and is nonphase-matchable (type 1).
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Affiliation(s)
- Nathan J Takas
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, Pennsylvania 15282, USA
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Curini M, Epifano F, Chimichi S, Montanari F, Nocchetti M, Rosati O. Potassium exchanged layered zirconium phosphate as catalyst in the preparation of 4H-chromenes. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.03.075] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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