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Abstract
We report on a diastereoselective synthesis of six derivatives of caffeoyl- and feruloyl-muco-quinic acids. All the muco-quinic acid derivatives were obtained in excellent yield in five steps starting from quinic acid, caffeic acid and ferulic acid. Allyl ether protection of trans-hydroxy cinnamic acids was here introduced to chlorogenic acids synthesis. We show that muco-quinic acid derivatives, which are formally diastereoisomers of chlorogenic acids, can be readily distinguished by their tandem mass spectra.
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Koner AL, Márquez C, Dickman MH, Nau WM. Inside Cover: Transition-Metal-Promoted Chemoselective Photoreactions at the Cucurbituril Rim (Angew. Chem. Int. Ed. 2/2011). Angew Chem Int Ed Engl 2010. [DOI: 10.1002/anie.201007638] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Koner AL, Márquez C, Dickman MH, Nau WM. Innentitelbild: Chemoselektive Photoreaktionen mithilfe von Übergangsmetallen in Cucurbiturilen (Angew. Chem. 2/2011). Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201007638] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Koner AL, Márquez C, Dickman MH, Nau WM. Chemoselektive Photoreaktionen mithilfe von Übergangsmetallen in Cucurbiturilen. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201005317] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Koner AL, Márquez C, Dickman MH, Nau WM. Transition-Metal-Promoted Chemoselective Photoreactions at the Cucurbituril Rim. Angew Chem Int Ed Engl 2010; 50:545-8. [DOI: 10.1002/anie.201005317] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ibrahim M, Dickman MH, Suchopar A, Kortz U. Large cation-anion materials based on trinuclear ruthenium(III) salts of Keggin and Wells-Dawson anions having water-filled channels. Inorg Chem 2010; 48:1649-54. [PMID: 19159321 DOI: 10.1021/ic802096v] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Reaction of the trinuclear ruthenium(III) cation [Ru(3)O(OOCCH(3))(6)(CH(3)OH)(3)](+) with the Keggin-type [alpha-GeW(11)O(39)](8-), [alpha-SiW(11)O(39)](8-), and [alpha-SiMo(12)O(40)](4-) and the Wells-Dawson-type [alpha-P(2)W(18)O(62)](6-) polyanions in an aqueous, acidic medium resulted in plenary polyoxometalate-based materials K(2)Na[Ru(3)O(OOCCH(3))(6)(H(2)O)(3)][alpha-GeW(12)O(40)].10H(2)O (1), K(3)[Ru(3)O(OOCCH(3))(6)(H(2)O)(3)][alpha-SiW(12)O(40)].18H(2)O (2), K(3)[Ru(3)O(OOCCH(3))(6)(H(2)O)(3)][alpha-SiMo(12)O(40)].7H(2)O (3), and K(2)Na[Ru(3)O(OOCCH(3))(6)(H(2)O)(3)](3)[alpha-P(2)W(18)O(62)].26H(2)O (4), respectively. All four materials, 1-4, crystallize as sodium and/or potassium salts in the monoclinic space group P2(1)/n. Compounds 1-4 were characterized by IR, thermogravimetric analysis, and single-crystal/powder X-ray diffraction (XRD). The isolated solid-state frameworks, composed of cocrystallized trinuclear ruthenium cations and polyanions, exhibit nanosized voids filled with crystal waters. These water molecules can be removed reversibly upon heating under a vacuum, and powder XRD measurements demonstrated that the crystallinity of the compound was preserved. Sorption studies on ethanol and methanol were also performed.
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Affiliation(s)
- Masooma Ibrahim
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
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Reinoso S, Piedra-Garza LF, Dickman MH, Praetorius A, Biesemans M, Willem R, Kortz U. Trilacunary A-β-Keggin tungstogermanates and -silicates functionalized with phenyltin(iv) electrophiles. Dalton Trans 2010:248-55. [DOI: 10.1039/b910889k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Izarova NV, Dickman MH, Biboum RN, Keita B, Nadjo L, Ramachandran V, Dalal NS, Kortz U. Heteropoly-13-palladates(II) [Pd(II)(13)(As(V)Ph)(8)O(32)](6-) and [Pd(II)(13)Se(IV)(8)O(32)](6-). Inorg Chem 2009; 48:7504-6. [PMID: 19722682 DOI: 10.1021/ic900953a] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two discrete anionic palladium(II)-oxo clusters have been prepared: [Pd(13)(As(V)Ph)(8)O(32)](6-) (1) and [Pd(13)Se(IV)(8)O(32)](6-) (2) were synthesized in one-pot self-assembly reactions of Pd(OAc)(2) with PhAsO(3)H(2) and SeO(2) and characterized by single-crystal X-ray analysis, IR, thermogravimetric analysis, elemental analysis, magnetic and electron paramagnetic resonance measurements, and electrochemistry.
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Affiliation(s)
- Natalya V Izarova
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
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Bi LH, Hou GF, Bao YY, Li B, Wu LX, Gao ZM, McCormac T, Mal SS, Dickman MH, Kortz U. Syntheses and Crystal Structures of dmso-Coordinated Tungstoantimonates(III) and -bismuthates(III). Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200900590] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Belai N, Kapoor PN, Dickman MH, Butcher RJ, Pope MT. Fusion of Coordination- and Polyoxometalate Chemistry â Chelated Cobalt(III) Centers as Structural Components of Polyoxomolybdates â [{Co(en)}4Mo10O38]4âand Macrocyclic [{CoII(H2O)2}Â{Co(en)}8{Mo20O76}]6â. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200900599] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Bi LH, Al-Kadamany G, Chubarova EV, Dickman MH, Chen L, Gopala DS, Richards RM, Keita B, Nadjo L, Jaensch H, Mathys G, Kortz U. Organo-Ruthenium Supported Heteropolytungstates: Synthesis, Structure, Electrochemistry, and Oxidation Catalysis. Inorg Chem 2009; 48:10068-77. [DOI: 10.1021/ic9009306] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Li-Hua Bi
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Ghada Al-Kadamany
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Elena V. Chubarova
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Michael H. Dickman
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Lifang Chen
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Divakara S. Gopala
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Ryan M. Richards
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Bineta Keita
- Laboratoire de Chimie Physique, UMR 8000, CNRS, Equipe d’Electrochimie et Photoélectrochimie, Université Paris-Sud, Bâtiment 350, 91405 Orsay Cedex, France
| | - Louis Nadjo
- Laboratoire de Chimie Physique, UMR 8000, CNRS, Equipe d’Electrochimie et Photoélectrochimie, Université Paris-Sud, Bâtiment 350, 91405 Orsay Cedex, France
| | - Helge Jaensch
- ExxonMobil Catalyst Technologies LLC, 4500 Bayway Drive, Baytown, Texas 77522
| | - Georges Mathys
- ExxonMobil Chemical Europe Inc., Hermeslaan 2, B-1831 Machelen, Belgium and Department of Chemistry and Geochemistry, Colorado School of Mines, 1500 Illinois, Golden, Colorado 80401
| | - Ulrich Kortz
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
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Nsouli NH, Ismail AH, Helgadottir IS, Dickman MH, Clemente-Juan JM, Kortz U. Copper-, Cobalt-, and Manganese-Containing 17-Tungsto-2-Germanates. Inorg Chem 2009; 48:5884-90. [DOI: 10.1021/ic900180x] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nadeen H. Nsouli
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Amal H. Ismail
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Inga S. Helgadottir
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Michael H. Dickman
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | | | - Ulrich Kortz
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
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Ismail AH, Nsouli NH, Dickman MH, Knez J, Kortz U. The 20-Tungsto-4-Tellurate(IV) [H2Te4W20O80]22− and the 15-Tungstotellurate(IV) [NaTeW15O54]13−. J CLUST SCI 2009. [DOI: 10.1007/s10876-009-0245-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Reinoso S, Dickman MH, Kortz U. Selective Crystallization of Dimeric vs. Monomeric Dimethyltin-Containing Tungstoarsenates(III) and -antimonates(III) with the Guanidinium Cation. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200801096] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Piedra-Garza LF, Reinoso S, Dickman MH, Sanguineti MM, Kortz U. The first 3-dimensional assemblies of organotin-functionalized polyanions. Dalton Trans 2009:6231-4. [DOI: 10.1039/b908436c] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Affiliation(s)
- Amal H. Ismail
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Michael H. Dickman
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Ulrich Kortz
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
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Chubarova EV, Dickman MH, Keita B, Nadjo L, Miserque F, Mifsud M, Arends IWCE, Kortz U. Self-assembly of a heteropolyoxopalladate nanocube: [Pd(II)13As(V)8O34(OH)6]8-. Angew Chem Int Ed Engl 2008; 47:9542-6. [PMID: 18850625 DOI: 10.1002/anie.200803527] [Citation(s) in RCA: 121] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Elena V Chubarova
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
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Piedra-Garza LF, Dickman MH, Moldovan O, Breunig HJ, Kortz U. Organoantimony-Containing Polyoxometalate: [{PhSbOH}3(A-α-PW9O34)2]9−. Inorg Chem 2008; 48:411-3. [DOI: 10.1021/ic8021694] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Luis F. Piedra-Garza
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut für Anorganische and Physikalische Chemie, Universität Bremen, Leobener Strasse, 28334 Bremen, Germany
| | - Michael H. Dickman
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut für Anorganische and Physikalische Chemie, Universität Bremen, Leobener Strasse, 28334 Bremen, Germany
| | - Ovidiu Moldovan
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut für Anorganische and Physikalische Chemie, Universität Bremen, Leobener Strasse, 28334 Bremen, Germany
| | - Hans Joachim Breunig
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut für Anorganische and Physikalische Chemie, Universität Bremen, Leobener Strasse, 28334 Bremen, Germany
| | - Ulrich Kortz
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut für Anorganische and Physikalische Chemie, Universität Bremen, Leobener Strasse, 28334 Bremen, Germany
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Barsukova M, Dickman MH, Visser E, Sankar Mal S, Kortz U. Synthesis and Structural Characterization of the Yttrium Containing Isopolytungstate [YW10O36]9−. Z Anorg Allg Chem 2008. [DOI: 10.1002/zaac.200800240] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Al-Kadamany GA, Hussain F, Mal SS, Dickman MH, Leclerc-Laronze N, Marrot J, Cadot E, Kortz U. Cyclic Ti9 Keggin Trimers with Tetrahedral (PO4) or Octahedral (TiO6) Capping Groups. Inorg Chem 2008; 47:8574-6. [DOI: 10.1021/ic801114n] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ghada A. Al-Kadamany
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
| | - Firasat Hussain
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
| | - Sib Sankar Mal
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
| | - Michael H. Dickman
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
| | - Nathalie Leclerc-Laronze
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
| | - Jérôme Marrot
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
| | - Emmanuel Cadot
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
| | - Ulrich Kortz
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
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Reinoso S, Dickman MH, Praetorius A, Piedra-Garza LF, Kortz U. Phenyltin-Substituted 9-Tungstogermanate and Comparison with Its Tungstosilicate Analogue. Inorg Chem 2008; 47:8798-806. [DOI: 10.1021/ic800852d] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Santiago Reinoso
- School of Engineering and Science, Jacobs University, P. O. Box 750 561, 28725 Bremen, Germany
| | - Michael H. Dickman
- School of Engineering and Science, Jacobs University, P. O. Box 750 561, 28725 Bremen, Germany
| | - Antonia Praetorius
- School of Engineering and Science, Jacobs University, P. O. Box 750 561, 28725 Bremen, Germany
| | | | - Ulrich Kortz
- School of Engineering and Science, Jacobs University, P. O. Box 750 561, 28725 Bremen, Germany
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Bassil BS, Mal SS, Dickman MH, Kortz U, Oelrich H, Walder L. 6-Peroxo-6-Zirconium Crown and Its Hafnium Analogue Embedded in a Triangular Polyanion: [M6(O2)6(OH)6(γ-SiW10O36)3]18− (M = Zr, Hf). J Am Chem Soc 2008; 130:6696-7. [DOI: 10.1021/ja801424q] [Citation(s) in RCA: 123] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bassem S. Bassil
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institute of Chemistry, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
| | - Sib Sankar Mal
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institute of Chemistry, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
| | - Michael H. Dickman
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institute of Chemistry, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
| | - Ulrich Kortz
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institute of Chemistry, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
| | - Holger Oelrich
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institute of Chemistry, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
| | - Lorenz Walder
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institute of Chemistry, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
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Reinoso S, Dickman MH, Praetorius A, Kortz U. Low-temperature phase of hexaguanidinium hepta-molybdate monohydrate. Acta Crystallogr Sect E Struct Rep Online 2008; 64:m614-5. [PMID: 21202171 PMCID: PMC2961279 DOI: 10.1107/s1600536808008234] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2008] [Accepted: 03/26/2008] [Indexed: 11/15/2022]
Abstract
The crystal structure of the title compound, [C(NH2)3]6[Mo7O24]·H2O, previously determined at room temperature in the monoclinic space group C2/c from Weissenberg techniques [Don & Weakley (1981 ▶). Acta Cryst. B37, 451–453], has been redetermined from low-temperature single-crystal data in the monoclinic space group P21/c. The asymmetric unit contains one heptamolybdate anion, six guanidinium cations and one water molecule of hydration. The anions and cations are linked by an extensive network of N—H⋯O hydrogen bonds.
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Affiliation(s)
- Santiago Reinoso
- School of Engineering and Science, Jacobs University Bremen, PO Box 750561, 28725 Bremen, Germany
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Sadakane M, Iimuro Y, Tsukuma D, Bassil BS, Dickman MH, Kortz U, Zhang Y, Ye S, Ueda W. Carbonyl–ruthenium substituted α-Keggin-tungstosilicate, [α-SiW11O39RuII(CO)]6−: synthesis, structure, redox studies and reactivity. Dalton Trans 2008:6692-8. [DOI: 10.1039/b810987g] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Nsouli NH, Mal SS, Dickman MH, Kortz U, Keita B, Nadjo L, Clemente-Juan JM. Two Iron-Containing Tungstogermanates: [K(H2O)(β-Fe2GeW10O37(OH))(γ-GeW10O36)]12- and [{β-Fe2GeW10O37(OH)2}2]12-. Inorg Chem 2007; 46:8763-70. [PMID: 17887749 DOI: 10.1021/ic701084x] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Interaction of the dilacunary polyanion precursor [gamma-GeW(10)O(36)](8-) with Fe(3+) ions in aqueous buffer medium (pH 4.8) results in the formation of two dimeric tungstogermanates depending on the reactant ratios. When using an Fe3+ to [gamma-GeW(10)O(36)](8-) ratio of 1:1, the asymmetric anion [K(H(2)O)(beta-Fe(2)GeW(10)O(37)(OH))(gamma-GeW(10)O(36))](12-) (1) is formed, whereas [{beta-Fe(2)GeW(10)O(37)(OH)2}2]12- (2) is formed when using a ratio of 2:1. Single-crystal X-ray analyses were carried out on Cs(3)K(9)[K(H(2)O)(beta-Fe(2)GeW(10)O(37)(OH))(gamma-GeW(10)O(36))].19H(2)O (CsK-1), which crystallizes in the triclinic system, space group P1, a = 11.4547(2), b = 19.9181(5), c = 21.0781(6) A, alpha = 66.7977(12), beta = 89.1061(12), gamma = 84.4457(11) degrees, and Z = 2 and on Cs(7)K(4)Na[{beta-Fe(2)GeW(10)O(37)(OH)(2)}(2)].39H(2)O (CsKNa-2), which crystallizes in the monoclinic system, space group C2/m, a = 32.7569(13), b = 12.2631(5), c = 14.2895(5) A, beta = 104.135(2) degrees , and Z = 2. Polyanion 1 consists of (beta-Fe(2)GeW(10)O(37)) and (gamma-GeW(10)O(36)) units linked via two Fe-O-W bridges and a central potassium ion. Two equivalent FeO(6) octahedra complete the belt of the beta-Keggin unit and link to the (gamma-GeW(10)O(36)) fragment. On the other hand, 2 consists of two {beta-Fe(2)GeW(10)O(37)(OH)(2)} units with four bridging hydroxo groups linking the four Fe(3+) ions, forming an eight-membered ring. The magnetic properties of CsK-1 and CsKNa-2 have been studied by magnetic susceptibility and magnetization measurements and fitted according to an isotropic exchange model. Both polyanions 1 and 2 exhibit diamagnetic ground states with a small amount of paramagnetic impurity. Electrochemistry studies on 1 and 2 were carried out in a pH 5 acetate medium. The two polyanions have in common the simultaneous reduction of all of their Fe(3+) centers. This observation suggests the existence of identical or almost-identical influences on these centers and their equivalence, especially in the reduced state. Controlled potential coulometry results indicate the presence of two Fe(3+) centers in 1 and four in 2. The splitting of the tungsten wave of 1 compared to the single tungsten wave of 2 is attributed to a difference in acid-base properties of the polyanions. Voltammetric peak-potential shifts as a function of pH were studied in the case of 2.
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Affiliation(s)
- Nadeen H Nsouli
- Jacobs University Bremen, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
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Bassil BS, Dickman MH, Römer I, von der Kammer B, Kortz U. The Tungstogermanate [Ce20Ge10W100O376(OH)4(H2O)30]56−: A Polyoxometalate Containing 20 Cerium(III) Atoms. Angew Chem Int Ed Engl 2007; 46:6192-5. [PMID: 17640015 DOI: 10.1002/anie.200701422] [Citation(s) in RCA: 212] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Bassem S Bassil
- Jacobs University Bremen, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
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28
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Chubarova EV, Klöck C, Dickman MH, Kortz U. Cation Dependent Formation of Hybrid Organic–Inorganic Frameworks Based on the Strandberg-Type Polyanion [(O2CCH2PO3)2Mo5O15]6− and Cu2+ Ions. J CLUST SCI 2007. [DOI: 10.1007/s10876-007-0128-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Abstract
The novel dimethyltin-containing polyanion [{(CH3)2Sn}6(OH)2O2(H2BW13O46)2]12- (1) is composed of two [H2BW13O46]9- clusters linked by an unprecedented planar, hexameric [{(CH3)2Sn}6(OH)2O2]8+ organostannoxane moiety, representing the first X-ray structural characterization of a molecular hybrid organic-inorganic tungstoborate and of the elusive [HnBW13O46](11-n)- species.
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Affiliation(s)
- Santiago Reinoso
- School of Engineering and Science, Jacobs University Bremen, P.O. Box 750 561, 28725 Bremen, Germany
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Bassil BS, Dickman MH, von der Kammer B, Kortz U. The Monolanthanide-Containing Silicotungstates [Ln(β2-SiW11O39)2]13- (Ln = La, Ce, Sm, Eu, Gd, Tb, Yb, Lu): A Synthetic and Structural Investigation. Inorg Chem 2007; 46:2452-8. [PMID: 17328540 DOI: 10.1021/ic061737d] [Citation(s) in RCA: 107] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have synthesized and structurally characterized the monolanthanide-containing polyanions [Ln(beta2-SiW11O39)2]13- (Ln = La (1), Ce (2), Sm (3), Eu (4), Gd (5), Tb (6), Yb (7), Lu (8)). Synthesis was accomplished by reaction of the respective lanthanide ion with the monolacunary Keggin-type precursor [beta2-SiW11O39]8- in a 1:2 molar ratio in 1 M KCl medium at pH 5. Polyanions 1-8 were isolated as potassium salts and then characterized by IR, single-crystal X-ray diffraction, and elemental as well as thermogravimetric analysis. The structures of 1-8 are composed of an eight-coordinated Ln3+ center sandwiched by two chiral (beta2-SiW11O39) units. Large Ln3+ ions appear to favor an (R,R) (or (S,S)) configuration (point group C2) of the Keggin units, with an increasing amount of (R,S) (or (S,R)) configuration (point group C1) found in the solid state as the Ln3+ ion decreases in size. This trend is also supported by solution 183W NMR results for the diamagnetic La3+ and Lu3+ derivatives.
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Affiliation(s)
- Bassem S Bassil
- School of Engineering and Science, International University Bremen, P.O. Box 750 561, 28725 Bremen, Germany
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31
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Zimmermann M, Belai N, Butcher RJ, Pope MT, Chubarova EV, Dickman MH, Kortz U. New Lanthanide-Containing Polytungstates Derived from the Cyclic P8W48 Anion: {Ln4(H2O)28[K⊂P8W48O184(H4W4O12)2Ln2(H2O)10]13-}x, Ln = La, Ce, Pr, Nd. Inorg Chem 2007; 46:1737-40. [PMID: 17295478 DOI: 10.1021/ic0624423] [Citation(s) in RCA: 107] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reaction of K28Li5H7[P8W48O184].92H2O with early lanthanides under hydrothermal and conventional conditions yields novel structures of the molecular formula Ln4(H2O)28K6Li7[K subsetP8W48O184(H4W4O12)2Ln2(H2O)10] congruent with 57H2O, Ln = La (1), Ce (2, 2a), Pr (3), Nd (4), in which the central cavity of the precursor anion is occupied by lanthanide cations and H4W4O12 moieties. The new heteropolyanions were characterized by elemental analysis, infrared spectroscopy, 31P NMR, and X-ray crystallography. All of the crystals are monoclinic, space group C2/m, with lattice constants (A, Epsilon) a = 33.061(3), b = 30.986(3), c = 15.1649(13), beta = 103.607(2), (1); a = 33.0577(16), b = 31.0562(15), c = 15.2320(7), beta = 104.015(2), (2); a = 33.0577(16), b = 31.0562(15), c = 15.2320(7), beta = 104.015(2), (2a); a = 33.007(2), b = 31.060(2), c = 15.2129(10), beta = 104.0140(10), (3); a = 32.913(19), b = 31.155(18), c = 15.135(9), beta = 103.495(11), (4); and Z = 2.
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Affiliation(s)
- Matthias Zimmermann
- Department of Chemistry, P.O. Box 571227, Georgetown University, Washington, DC 20057, USA
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32
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Nomiya K, Pohl M, Mizuno N, Lyon DK, Finke RG, Dickman MH, Glickman DC, Kortz U, Samonte JL, Xin F, Pope MT. Polyoxoanion-Supported, Atomically Dispersed Iridium(I) and Rhodium(I): Na3
[(C4
H9
)4
N]5
[Ir[α-Nb3
P2
W15
O62
]{η
4
-C8
H12
}] and Na3
[(C4
H9
)4
N]5
[Rh[α-Nb3
P2
W15
O62
]{η
4
-C8
H12
}]. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/9780470132623.ch29] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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Mal SS, Nsouli NH, Dickman MH, Kortz U. Organoruthenium derivative of the cyclic [H7P8W48O184]33? anion: [{K(H2O)}3{Ru(p-cymene)(H2O)}4P8W49O186(H2O)2]27? Dalton Trans 2007:2627-30. [PMID: 17576486 DOI: 10.1039/b706762n] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reaction of [Ru(p-cymene)Cl2]2 with [H7P8W48O184]33- (P8W48) in aqueous acidic medium results in the organometallic derivative [{K(H2O)}3{Ru(p-cymene)(H2O)}4P8W49O186(H2O)2]27- (1); in addition to the four {Ru(p-cymene)(H2O)} units, an unusual WO6 group with four equatorial, terminal ligands is also grafted to the crown-shaped P8W48 precursor.
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Affiliation(s)
- Sib Sankar Mal
- Jacobs University Bremen, School of Engineering and Science, 28725 Bremen, Germany
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Sadakane M, Tsukuma D, Dickman MH, Bassil BS, Kortz U, Capron M, Ueda W. Dimerization of mono-ruthenium substituted α-Keggin-type tungstosilicate [α-SiW11O39RuIII(H2O)]5−to µ-oxo-bridged dimer in aqueous solution: synthesis, structure, and redox studies. Dalton Trans 2007:2833-8. [PMID: 17592600 DOI: 10.1039/b702813j] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the dimerization of a mono-ruthenium(III) substituted alpha-Keggin-type tungstosilicate [alpha-SiW(11)O(39)Ru(III)(H2O)](5-) to a micro-oxo-bridged dimer [{alpha-SiW(11)O(39)Ru(m)}2O](n-) (m = III, n = 12; m = IV/III, n = 11; m = IV, n = 10). Single crystal X-ray structure analysis of Rb(10)[{alpha-SiW(11)O(39)Ru(IV)}2O].9.5H2O (triclinic, P1, with a = 12.7650(6) A, b = 18.9399(10) A, c = 20.2290(10) A, alpha = 72.876(3) degrees, beta = 88.447(3) degrees, gamma = 80.926(3) degrees, V = 4614.5(4) A(3), Z = 2) reveals that two mono-ruthenium substituted tungstosilicate alpha-Keggin units are connected through micro-oxo-bridging Ru-O-Ru bonds. Solution (183)W-NMR of [{SiW(11)O(39)Ru(IV)}2O](10-) resulted in six peaks (-63, -92, -110, -128, -132, and -143 ppm, intensities 2 : 2 : 1 : 2 : 2 : 2) confirming that the micro-oxo bridged dimer structure is maintained in aqueous solution. The dimerization mechanism is presumably initiated by deprotonation of the aqua-ruthenium complex [alpha-SiW(11)O(39)Ru(III)(H2O)](5-) leading to a hydroxy-ruthenium complex [alpha-SiW(11)O(39)Ru(III)(OH)](6-). Dimerization of two hydroxy-ruthenium complexes produces the micro-oxo bridged dimer [{alpha-SiW(11)O(39)Ru(III)}2O](12-) and a water molecule. The Ru(III) containing dimer is oxidized by molecular oxygen to produce a mixed valence species [{alpha-SiW(11)O(39)Ru(IV-III)}2O](11-), and further oxidation results in the Ru(IV) containing [{alpha-SiW(11)O(39)Ru(IV)}2O](10-).
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Affiliation(s)
- Masahiro Sadakane
- Catalysis Research Center, Hokkaido University, N-21, W-10, 001-0021 Sapporo, Japan.
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Abstract
Reaction of Na2WO4 and (CH3)2SnCl2 in water (pH 7) led to the formation of the hybrid organic-inorganic polyanion [{(CH3)2Sn}2(W6O22)]4- (1), which is composed of a novel hexatungstate core stabilized by two dimethyltin groups. Selective crystallization of 1 with guanidinium cations resulted in [C(NH2)3]4[{CH3)2Sn}2(W6O22)]2H2O (1a), which exhibits a 1D arrangement via distorted trigonal-bipyramidal cis-(CH3)2SnO3 moieties.
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Affiliation(s)
- Santiago Reinoso
- School of Engineering and Science, International University Bremen, 28725 Bremen, Germany
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Bakirci H, Koner AL, Dickman MH, Kortz U, Nau WM. Dynamically Self-Assembling Metalloenzyme Models Based on Calixarenes. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200602999] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Affiliation(s)
- Hüseyin Bakirci
- School of Engineering and Science, International University Bremen, Campus Ring 1, 28759 Bremen, Germany
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38
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Abstract
Reaction of (CH3)2SnCl2 with Na2MoO4 in an aqueous medium results in three different compounds depending on the pH: [{(CH3)2Sn}(MoO4)] (1), [{(CH3)2Sn}4O2(MoO4)2] (2), and [{(CH3)2Sn}{Mo2O7(H2O)2}].H2O (3). All three species have been characterized in the solid state by means of elemental analysis, infrared spectroscopy, thermogravimetry, and single-crystal X-ray diffraction. Compounds 1-3 all show hybrid organic-inorganic extended lattices based on molybdate anions linked by (CH3)2Sn2+ moieties, and the coordination numbers of the Sn(IV) centers range from 5 to 7. Compound 1 crystallizes in the orthorhombic space group Pnma with cell parameters a = 13.2035(4) A, b = 7.2634(2) A, c = 7.1458(2) A, and Z = 4. 1 exhibits a complex, 3-dimensional network structure constructed of corner-shared, tetrahedral orthomolybdate oxoanions and distorted octahedral trans-(CH3)2SnO4 groups. Compound 2 crystallizes in the monoclinic space group P2(1)/n with cell parameters a = 8.2330(1) A, b = 11.4033(2) A, c = 12.1529(2) A, beta = 91.566(1) degrees , and Z = 2. Its 2-dimensional layered structure contains dimeric tetramethyldistannoxane [{(CH3)2Sn}4O2]2+ subunits built up of edge-sharing cis-(CH3)2SnO4 distorted trigonal bipyramids and connected in the (1,0,) plane by tetrahedral orthomolybdate oxoanions, the layers packing along the crystallographic a axis with the methyl groups pointing to the interlamellar space. Compound 3 crystallizes in the orthorhombic space group Pbcm with cell parameters a = 6.5594(4) A, b = 14.2465(11) A, c = 11.3892(8) A, and Z = 4. It shows dimeric [Mo2O8(H2O)2] units sharing corners to form zigzagging polymeric {[Mo2O7(H2O)2]2-}infinity polyanions along the [001] direction; these chains are further linked by trans-(CH3)2SnO5 distorted pentagonal bipyramids to give layers parallel to the (010) plane, the interlamellar space being occupied by hydrogen-bonded hydration water molecules.
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Affiliation(s)
- Santiago Reinoso
- School of Engineering and Science, International University Bremen, P.O. Box 750 561, 28725 Bremen, Germany
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Bi LH, Chubarova EV, Nsouli NH, Dickman MH, Kortz U, Keita B, Nadjo L. Dilacunary Decatungstates Functionalized by Organometallic Ruthenium(II), [{Ru(C6H6)(H2O)}{Ru(C6H6)}(γ-XW10O36)]4- (X = Si, Ge). Inorg Chem 2006; 45:8575-83. [PMID: 17029368 DOI: 10.1021/ic0606835] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The benzene-Ru(II)-supported dilacunary decatungstosilicate [{Ru(C6H6)(H2O)}{Ru(C6H6)}(gamma-SiW10O36)]4- and the isostructural decatungstogermanate [{Ru(C6H6)(H2O)}{Ru(C6H6)}(gamma-GeW10O36)]4- have been synthesized and characterized by multinuclear solution NMR, IR, elemental analysis, and electrochemistry. Single-crystal X-ray analysis was carried out on K4[{Ru(C6H6)(H2O)}{Ru(C6H6)}(gamma-SiW10O36)].9H2O (K-1), which crystallizes in the orthorhombic system, space group Pmn2(1), with a = 13.6702(3) A, b = 16.2419(4) A, c = 12.1397(2) A, and Z = 2, and on K4[{Ru(C6H6)(H2O)}{Ru(C6H6)}(gamma-GeW10O36)].7H2O (K-2), which also crystallizes in the orthorhombic system, space group Pmn2(1), with a = 13.6684(12) A, b = 16.297(2) A, c = 12.1607(13) A, and Z = 2. Polyanions 1 and 2 consist of a Ru(C6H6)(H2O) group and a Ru(C6H6) group linked to a dilacunary (gamma-XW10O36) Keggin fragment resulting in an assembly with idealized Cs symmetry. The Ru(C6H6)(H2O) group is bound at the lacunary polyanion site via two Ru-O(W) bonds, whereas the Ru(C6H6) group is bound on the side via three Ru-O(W) bonds. Polyanions 1 and 2 were synthesized in aqueous acidic medium at pH 2.5 by the reaction of [Ru(C6H6)Cl2]2 with [gamma-SiW10O36]8- and [gamma-GeW10O36]8-, respectively. The formal potentials are roughly the same for the first W waves of 1 and 2. However, important differences appear for the second W waves. These observations indicate different acid-base properties for the reduced forms of 1 and 2. Three oxidation processes were detected: the oxidation of the Ru center is followed first by irreversible electrocatalytic processes of the Ru-benzene moiety and then of the electrolyte. Comparison of this behavior with that of the precursor reagent, [Ru(C6H6)Cl2]2, was useful to understand the main oxidation processes. A ligand substitution reaction was observed upon addition of dimethyl sulfoxide (dmso) to 1, 2, or [Ru(C6H6)Cl2]2. This reaction facilitates substantially the oxidation of the Ru center. The dmso was oxidized with large electrocatalytic currents more efficiently in the presence of 1 and 2 than with [Ru(C6H6)Cl2]2.
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Affiliation(s)
- Li-Hua Bi
- International University Bremen, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
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Nsouli NH, Bassil BS, Dickman MH, Kortz U, Keita B, Nadjo L. Synthesis and Structure of Dilacunary Decatungstogermanate, [γ-GeW10O36]8-. Inorg Chem 2006; 45:3858-60. [PMID: 16676943 DOI: 10.1021/ic0603252] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dilacunary decatungstogermanate [gamma-GeW10O36]8- (1) has been synthesized and structurally characterized in solution and in the solid state. Reaction of germanium dioxide with sodium tungstate in aqueous acidic medium results in the formation of [beta2-GeW11O39]8- (2), which is then used as a precursor for the synthesis of 1. The (183)W spectrum of 2 shows the expected 11 peaks of equal intensity, whereas that of 1 exhibits the expected three peaks with relative intensities 2:2:1. Polyanion 1 represents a novel lacunary polyoxometalate, giving rise to a multitude of derivatives by reaction with transition metals, lanthanides, and other electrophiles.
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Affiliation(s)
- Nadeen H Nsouli
- International University Bremen, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
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Bi LH, Kortz U, Dickman MH, Nellutla S, Dalal NS, Keita B, Nadjo L, Prinz M, Neumann M. Polyoxoanion with Octahedral Germanium(IV) Hetero Atom: Synthesis, Structure, Magnetism, EPR, Electrochemistry and XPS Studies on the Mixed-Valence 14-Vanadogermanate [GeVV 12VIV 2O40]8−. J CLUST SCI 2006. [DOI: 10.1007/s10876-006-0048-y] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bassil BS, Dickman MH, Kortz U. Synthesis and Structure of Asymmetric Zirconium-Substituted Silicotungstates, [Zr6O2(OH)4(H2O)3(β-SiW10O37)3]14- and [Zr4O2(OH)2(H2O)4(β-SiW10O37)2]10-. Inorg Chem 2006; 45:2394-6. [PMID: 16529455 DOI: 10.1021/ic052131c] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction of ZrCl4 with [gamma-SiW10O36]8- in a potassium acetate buffer results in two different products depending on the reactant ratios. The trimeric species [Zr6O2(OH)4(H2O)3(beta-SiW10O37)3]14- (1) consists of three beta23-SiW10O37 units linked by an unprecedented Zr6O2(OH)4(H2O)3 cluster with C1 point group symmetry. The dimeric species [Zr4O2(OH)2(H2O)4(beta-SiW10O37)2]10- (2) consists of beta22- and beta12-SiW10O37 units sandwiching a Zr4O2(OH)2(H2O)4 cluster, which also has C1 symmetry. Polyanion 1 contains more zirconium centers than any other polyoxometalate known to date.
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Affiliation(s)
- Bassem S Bassil
- School of Engineering and Science, International University Bremen, P.O. Box 750561, 28725 Bremen, Germany
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Sadakane M, Tsukuma D, Dickman MH, Bassil B, Kortz U, Higashijima M, Ueda W. Structural characterization of mono-ruthenium substituted Keggin-type silicotungstates. Dalton Trans 2006:4271-6. [PMID: 16932820 DOI: 10.1039/b606266k] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have synthesized the mono-ruthenium substituted Keggin-type silicotungstate [SiW(11)O(39)Ru(III)(H(2)O)](5-) (1a) by reaction of the mono-lacunary silicotungstate precursor [SiW(11)O(39)](8-) with Ru(acac)(3) under hydrothermal conditions and isolated as the caesium salt Cs(5)[SiW(11)O(39)Ru(III)(H(2)O)] (1). The DMSO-coordinated complex [SiW(11)O(39)Ru(III)(DMSO)](5-) (2a) was prepared by reaction of 1a with DMSO in aqueous solution at 353 K and isolated as the caesium-potassium mixed salt Cs(4.9)K(0.1)[SiW(11)O(39)Ru(III)(DMSO)] (2). Both compounds 1 and 2 were characterized by single-crystal X-ray structure analysis, powder X-ray structure analysis, UV-Vis spectroscopy, cyclic voltammetry, IR-spectroscopy and elemental analysis. 1 crystallized in the tetragonal space group P4(2)/ncm with a = 20.9299(4), c = 10.3603(4) Angstrom, Z = 4. The ruthenium atom in the Keggin unit could not be distinguished from the tungsten due to disorder. The structural analysis of 2 (monoclinic, P2(1)/c, a = 13.5850(4), b = 20.2764(7), c = 18.1326(4) Angstrom, beta = 90.8730(10) degrees , Z = 4) successfully revealed that the incorporated ruthenium atom is coordinated by DMSO through a Ru-S bond. Polyanion 2a represents the first mono-substituted Keggin ion in which the ruthenium center is not crystallographically disordered. UV-Vis spectroscopy combined with controlled potential electrolysis confirmed that the incorporated rutheniums in 1 and 2 have a valence state of +3. The IR spectra of both 1 and 2 were very similar. All these data indicate that 1 synthesized by reaction of the mono-lacunary silicotungstate K(8)[SiW(11)O(39)] with Ru(acac)(3) under hydrothermal conditions is truly the mono-ruthenium substituted Keggin-type silicotungstate.
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Affiliation(s)
- Masahiro Sadakane
- Catalysis Research Center, Hokkaido University, N-21, W-10, 001-0021 Sapporo, Japan.
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Bassil BS, Dickman MH, Reicke M, Kortz U, Keita B, Nadjo L. Transition metal containing decatungstosilicate dimer [M(H2O)2(γ-SiW10O35)2]10−(M = Mn2+, Co2+, Ni2+). Dalton Trans 2006:4253-9. [PMID: 16932818 DOI: 10.1039/b606911h] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The new, monometal substituted silicotungstates [Mn(H(2)O)(2)(gamma-SiW(10)O(35))(2)](10-) (1), [Co(H(2)O)(2)(gamma-SiW(10)O(35))(2)](10-) (2) and [Ni(H(2)O)(2)(gamma-SiW(10)O(35))(2)](10-) (3) have been synthesized and isolated as the potassium salts K(10)[Mn(H(2)O)(2)(gamma-SiW(10)O(35))(2)] x 8.25 H(2)O (K-1), K(10)[Co(H(2)O0(2)(gamma-SiW(10)O(35))(2)] x 8.25 H(2)O (K-2) and K(10)[Ni(H(2)O)(2)(gamma-SiW(10)O(35))(2)] x 13.5 H(2)O (K-3), which have been characterized by IR spectroscopy, single crystal X-ray diffraction, elemental analysis and cyclic voltammetry. Polyanions 1-3 are composed of two (gamma-SiW(10)O(36)) units fused on one side via two W-O-W' bridges and on the other side by an octahedrally coordinated trans-MO(4)(OH(2))(2) transition metal fragment, resulting in a structure with C(2v) point group symmetry. Anions 1-3 were synthesized by reaction of the dilacunary precursor [gamma-SiW(10)O(36)](8-) with Mn(2+), Co(2+) and Ni(2+) ions, respectively, in 1 M KCl solution at pH 4.5. The electrochemical properties of 1-3 were studied by cyclic voltammetry and controlled potential coulometry in a pH 5 buffer medium. The waves associated with the W-centers are compared with each other and with those of the parent lacunary precursor [gamma-SiW(10)O(36)](8-) in the same medium. They appear to be dominated by the acid-base properties of the intermediate reduced species. A facile merging of the waves for 3 is observed while those for 1 and 2 remain split. Controlled potential coulometry of the single wave of 3 or the combined waves of 1 and 2 is accompanied by catalysis of the hydrogen evolution reaction. No redox activity was detected for the Ni(2+) center in 3, whereas the Co(2+) center in 2 shows a one-electron redox process. The two-electron, chemically reversible process of the Mn(2+) center in 1 is accompanied by a film deposition on the electrode surface.
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Affiliation(s)
- Bassem S Bassil
- International University Bremen, School of Engineering and Science, P. O. Box 750 561, 28725 Bremen, Germany
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Bi LH, Kortz U, Dickman MH, Keita B, Nadjo L. Trilacunary Heteropolytungstates Functionalized by Organometallic Ruthenium(II), [(RuC6H6)2XW9O34]6- (X = Si, Ge). Inorg Chem 2005; 44:7485-93. [PMID: 16212374 DOI: 10.1021/ic0508627] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The benzene-Ru(II)-supported trilacunary heteropolytungstates [(RuC6H6)2XW9O34]6- (X = Si, 1; Ge, 2) have been synthesized and characterized by multinuclear solution NMR (183W, 13C, 1H, 29Si), UV-vis and IR spectroscopy, electrochemistry, and elemental analysis. Single-crystal X-ray analysis was carried out on Rb2Na4[(RuC6H6)2SiW9O34].21H2O (RbNa-1), which crystallizes in the triclinic system, space group P, with a = 11.9415(2) A, b = 13.3123(2) A, c = 19.4927(4) A, alpha = 96.6460(10) degrees , beta = 95.1570(10) degrees , gamma = 98.2560(10) degrees , and Z = 2 and on Cs2Na4[(RuC6H6)2GeW9O34].19.5H2O (CsNa-2), which crystallizes also in the triclinic system, space group P, with a = 11.930(4) A, b = 13.353(4) A, c = 19.586(6) A, alpha = 95.982(5) degrees , beta = 95.414(6) degrees , gamma = 98.142(5) degrees , and Z = 2. The novel polyanion structure consists of two (RuC6H6) units linked to a trilacunary (XW9O34) Keggin fragment via Ru-O(W) and Ru-O(X) bonds resulting in an assembly with Cs symmetry. Polyanions 1 and 2 were synthesized by reaction of [RuC6H6Cl2]2 with [A-alpha-XW9O34]10- in aqueous buffer medium (pH 6.0). Both 1 and 2 are stable in solution as indicated by the expected 5-line pattern (2:1:2:2:2) in the 183W NMR and the expected (3C, 1H, and 29Si spectra. Descriptions of the respective electrochemical behaviors of the W centers and the Ru centers in 1 and 2 are given in media where these processes are clearly defined. In a pH = 3 acetate medium, the cyclic voltammetry of the W centers shows the known fingerprint of the trilacunary alpha-[XW9O34]n- (X = Ge, Si) moieties. The presence of the (RuC6H6) substituents imparts a good stability to these fragments in solution. Stepwise oxidation of the Ru centers was suspected in pH = 5 acetate medium, but only the first step was well-separated from a large current composite wave. The stepwise oxidation was finally observed clearly in a DMF-water (90/10 v/v) mixture and shows two well-behaved Ru oxidation processes. A short comparison is made with DMSO-bearing Ru polyoxometalates.
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Affiliation(s)
- Li-Hua Bi
- International University Bremen, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
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Abstract
The ruthenium(II)-supported heteropolyanions [HXW7O28Ru(dmso)3]6-(X=P, 1; As, 2) are composed of a Ru(dmso)3 group attached to an unprecedented heptatungstate fragment via two Ru-O-W bonds and one Ru-O-X bond, which represents a fundamentally novel mode of Ru-coordination to a polyoxoanion framework. Multinuclear 183W, 31P, 13C, and 1H NMR studies indicate high stability of 1 and 2 in solution.
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Affiliation(s)
- Li-Hua Bi
- International University Bremen, School of Engineering and Science, P.O. Box 750 561, 28725, Bremen, Germany
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Belai N, Dickman MH, Pope MT, Contant R, Keita B, Mbomekalle IM, Nadjo L. Confirmation of the Semivacant Wells−Dawson Polyoxotungstate Skeleton. The Structures of [Ce{X(H4)W17O61}2]19- (X = P, As) Indicate the Probable Location of Internal Protons. Inorg Chem 2004; 44:169-71. [PMID: 15651857 DOI: 10.1021/ic048920w] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reaction of Ce(III) with lacunary versions of [H(4)XW(18)O(62)](7-) (X = P, As) yields the 1:2 complexes [Ce(H(4)XW(17)O(61)](19-) (X = As, 1; P, 2) in good yield, characterized in solution and the solid state by NMR spectroscopy and X-ray crystallographic analysis, respectively. The structures confirm a syn C(2) conformation that is analogous to that observed for [Ln(alpha(2)-P(2)W(17)O(61))(2)](17-) but with "empty" O(4) tetrahedra that are in positions remote from the cerium atom. Bond valence sum calculations for these structures show that the four protons that are required for charge balance in all salts of the XW(18) anions and their lacunary derivatives are almost certainly bound to the oxygen atoms of the empty tetrahedra.
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Affiliation(s)
- Nebebech Belai
- Chemistry Department, Georgetown University, Washington, D.C., 20057-1227, USA
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Abstract
The ruthenium-supported isopolyanion [HW(9)O(33)Ru(II)(2)(dmso)(6)](7-) (1) is composed of a nonatungstate wheel stabilized by two Ru(dmso)(3) groups, representing the first structurally characterized Ru-coordinated polyoxotungstate and a novel class of isopolyanions supporting photochromic moieties.
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Affiliation(s)
- Lihua Bi
- International University Bremen, School of Engineering and Science, PO Box 750 561, 28725 Bremen, Germany
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