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Wild U, Hübner O, Meiners P, Kaifer E, Enders M, Himmel HJ. Intramolecular Through-Space Double-Electron Transfer Between A Pair of Redox-Active Guanidine Units Aligned by Dithiolate Bridges. Chemistry 2023; 29:e202302418. [PMID: 37606189 DOI: 10.1002/chem.202302418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 08/22/2023] [Accepted: 08/22/2023] [Indexed: 08/23/2023]
Abstract
Using unconventional synthesis protocols, two redox-active triguanidine units are connected by a dithiolate bridge, aligning the two redox-active units in close proximity. The reduced, neutral and the tetracationic redox states with two dicationic triguanidine units are isolated and fully characterized. Then, the dicationic redox states are prepared by mixing the neutral and tetracationic molecules. At low temperatures, the dications are diamagnetic (singlet ground state) with two different triguanidine units (neutral and dicationic). At room temperature, the triplet state with two radical monocationic triguanidine units is populated. At low temperature (210 K), chemical exchange by intramolecular through-space electron-transfer between the two triguanidine units is evidenced by EXSY NMR spectroscopy. Intramolecular through-space transfer of two electrons from the neutral to the dicationic triguanidine unit is accompanied by migration of the counterions in opposite direction. The rate of double-electron transfer critically depends on the bridge. No electron-transfer is measured in the absence of a bridge (in a mixture of one dicationic and one neutral triguanidine), and relatively slow electron transfer if the bridge does not allow the two triguanidine units to approach each other close enough. The results give detailed, quantitative insight into the factors that influence intramolecular through-space double-electron-transfer processes.
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Affiliation(s)
- Ute Wild
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Olaf Hübner
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Paul Meiners
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Elisabeth Kaifer
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Markus Enders
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Hans-Jörg Himmel
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
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Wild U, Hübner O, Enders M, Kaifer E, Himmel HJ. Connecting Organic Redox‐Active Building Blocks Through Mild Non‐Catalytic C‐H Activation. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ute Wild
- Ruprecht Karls Universitat Heidelberg Fakultat fur Chemie und Geowissenschaften Chemistry GERMANY
| | - Olaf Hübner
- Ruprecht Karls Universitat Heidelberg Fakultat fur Chemie und Geowissenschaften Chemistry GERMANY
| | - Markus Enders
- Ruprecht Karls Universitat Heidelberg Fakultat fur Chemie und Geowissenschaften Chemistry GERMANY
| | - Elisabeth Kaifer
- Ruprecht Karls Universitat Heidelberg Fakultat fur Chemie und Geowissenschaften Chemistry GERMANY
| | - Hans-Jörg Himmel
- Ruprecht-Karls-Universität Heidelberg Institut für Anorganische Chemie Im Neuenheimer Feld 270 69120 Heidelberg GERMANY
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Stoetzel S, Malhan D, Wild U, Helbing C, Hassan F, Attia S, Jandt KD, Heiss C, El Khassawna T. Osteocytes Influence on Bone Matrix Integrity Affects Biomechanical Competence at Bone-Implant Interface of Bioactive-Coated Titanium Implants in Rat Tibiae. Int J Mol Sci 2021; 23:374. [PMID: 35008800 PMCID: PMC8745552 DOI: 10.3390/ijms23010374] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Revised: 12/23/2021] [Accepted: 12/28/2021] [Indexed: 02/07/2023] Open
Abstract
Osseointegration is a prerequisite for the long-term success of implants. Titanium implants are preferred for their biocompatibility and mechanical properties. Nonetheless, the need for early and immediate loading requires enhancing these properties by adding bioactive coatings. In this preclinical study, extracellular matrix properties and cellular balance at the implant/bone interface was examined. Polyelectrolyte multilayers of chitosan and gelatin or with chitosan and Hyaluronic acid fabricated on titanium alloy using a layer-by-layer self-assembly process were compared with native titanium alloy. The study aimed to histologically evaluate bone parameters that correlate to the biomechanical anchorage enhancement resulted from bioactive coatings of titanium implants in a rat animal model. Superior collagen fiber arrangements and an increased number of active osteocytes reflected a significant improvement of bone matrix quality at the bone interface of the chitosan/gelatin-coated titan implants over chitosan/hyaluronic acid-coated and native implants. Furthermore, the numbers and localization of osteoblasts and osteoclasts in the reparative and remodeling phases suggested a better cellular balance in the chitosan/Gel-coated group over the other two groups. Investigating the micro-mechanical properties of bone tissue at the interface can elucidate detailed discrepancies between different promising bioactive coatings of titanium alloys to maximize their benefit in future medical applications.
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Affiliation(s)
- Sabine Stoetzel
- Experimental Trauma Surgery, Faculty of Medicine, Justus-Liebig-University, Aulweg 128, 35392 Giessen, Germany; (S.S.); (D.M.); (U.W.); (F.H.); (C.H.)
| | - Deeksha Malhan
- Experimental Trauma Surgery, Faculty of Medicine, Justus-Liebig-University, Aulweg 128, 35392 Giessen, Germany; (S.S.); (D.M.); (U.W.); (F.H.); (C.H.)
| | - Ute Wild
- Experimental Trauma Surgery, Faculty of Medicine, Justus-Liebig-University, Aulweg 128, 35392 Giessen, Germany; (S.S.); (D.M.); (U.W.); (F.H.); (C.H.)
| | - Christian Helbing
- Chair of Materials Science (CMS), Otto Schott Institute of Materials Research (OSIM), Faculty of Physics and Astronomy, Friedrich Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany; (C.H.); (K.D.J.)
| | - Fathi Hassan
- Experimental Trauma Surgery, Faculty of Medicine, Justus-Liebig-University, Aulweg 128, 35392 Giessen, Germany; (S.S.); (D.M.); (U.W.); (F.H.); (C.H.)
| | - Sameh Attia
- Department of Oral and Maxillofacial Surgery, Justus-Liebig University of Giessen, Klinikstrasse 33, 35392 Giessen, Germany;
| | - Klaus D. Jandt
- Chair of Materials Science (CMS), Otto Schott Institute of Materials Research (OSIM), Faculty of Physics and Astronomy, Friedrich Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany; (C.H.); (K.D.J.)
| | - Christian Heiss
- Experimental Trauma Surgery, Faculty of Medicine, Justus-Liebig-University, Aulweg 128, 35392 Giessen, Germany; (S.S.); (D.M.); (U.W.); (F.H.); (C.H.)
- Department of Trauma, Hand and Reconstructive Surgery, Justus-Liebig University Giessen, Rudolf-Buchheim-Strasse 7, 35392 Giessen, Germany
| | - Thaqif El Khassawna
- Experimental Trauma Surgery, Faculty of Medicine, Justus-Liebig-University, Aulweg 128, 35392 Giessen, Germany; (S.S.); (D.M.); (U.W.); (F.H.); (C.H.)
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Wild U, Walter P, Hübner O, Kaifer E, Himmel HJ. Evaluation of the Synthetic Scope and the Reaction Pathways of Proton-Coupled Electron Transfer with Redox-Active Guanidines in C-H Activation Processes. Chemistry 2020; 26:16504-16513. [PMID: 32893902 PMCID: PMC7756729 DOI: 10.1002/chem.202003424] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 09/04/2020] [Indexed: 11/28/2022]
Abstract
Proton‐coupled electron transfer (PCET) is currently intensively studied because of its importance in synthetic chemistry and biology. In recent years it was shown that redox‐active guanidines are capable PCET reagents for the selective oxidation of organic molecules. In this work, the scope of their PCET reactivity regarding reactions that involve C−H activation is explored and kinetic studies carried out to disclose the reaction mechanisms. Organic molecules with potential up to 1.2 V vs. ferrocenium/ferrocene are efficiently oxidized. Reactions are initiated by electron transfer, followed by slow proton transfer from an electron‐transfer equilibrium.
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Affiliation(s)
- Ute Wild
- Institut für Anorganische Chemie, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Petra Walter
- Institut für Anorganische Chemie, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Olaf Hübner
- Institut für Anorganische Chemie, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Elisabeth Kaifer
- Institut für Anorganische Chemie, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Hans-Jörg Himmel
- Institut für Anorganische Chemie, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
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Wild U, Hübner O, Himmel H. Cover Feature: Redox‐Active Guanidines in Proton‐Coupled Electron‐Transfer Reactions: Real Alternatives to Benzoquinones? (Chem. Eur. J. 70/2019). Chemistry 2019. [DOI: 10.1002/chem.201904858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ute Wild
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Olaf Hübner
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Hans‐Jörg Himmel
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
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Wild U, Hübner O, Himmel H. Redox-Active Guanidines in Proton-Coupled Electron-Transfer Reactions: Real Alternatives to Benzoquinones? Chemistry 2019; 25:15988-15992. [PMID: 31535741 PMCID: PMC7065378 DOI: 10.1002/chem.201903438] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Indexed: 01/24/2023]
Abstract
Guanidino-functionalized aromatics (GFAs) are readily available, stable organic redox-active compounds. In this work we apply one particular GFA compound, 1,2,4,5-tetrakis(tetramethylguanidino)benzene, in its oxidized form in a variety of oxidation/oxidative coupling reactions to demonstrate the scope of its proton-coupled electron transfer (PCET) reactivity. Addition of an excess of acid boosts its oxidation power, enabling the oxidative coupling of substrates with redox potentials of at least +0.77 V vs. Fc+ /Fc. The green recyclability by catalytic re-oxidation with dioxygen is also shown. Finally, a direct comparison indicates that GFAs are real alternatives to toxic halo- or cyano-substituted benzoquinones.
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Affiliation(s)
- Ute Wild
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Olaf Hübner
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Hans‐Jörg Himmel
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
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7
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Wild U, Hübner O, Greb L, Enders M, Kaifer E, Himmel HJ. Cover Feature: Twofold Oxidized and Twofold Protonated Redox-Active Guanidine: An Ultimate Intermediate in Proton-Coupled Electron-Transfer Reactions (Eur. J. Org. Chem. 43/2018). European J Org Chem 2018. [DOI: 10.1002/ejoc.201801632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ute Wild
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Olaf Hübner
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Lutz Greb
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Markus Enders
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Elisabeth Kaifer
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Hans-Jörg Himmel
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
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8
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Wild U, Hübner O, Greb L, Enders M, Kaifer E, Himmel HJ. Twofold Oxidized and Twofold Protonated Redox-Active Guanidine: An Ultimate Intermediate in Proton-Coupled Electron-Transfer Reactions. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801378] [Citation(s) in RCA: 14] [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: 11/07/2022]
Affiliation(s)
- Ute Wild
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Olaf Hübner
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Lutz Greb
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Markus Enders
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Elisabeth Kaifer
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Hans-Jörg Himmel
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
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9
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Affiliation(s)
- Ute Wild
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Deutschland
| | - Florian Schön
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Deutschland
| | - Hans-Jörg Himmel
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Deutschland
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Wild U, Schön F, Himmel HJ. Oxidation of Organic Molecules with a Redox-Active Guanidine Catalyst. Angew Chem Int Ed Engl 2017; 56:16410-16413. [DOI: 10.1002/anie.201709809] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Ute Wild
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Florian Schön
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Hans-Jörg Himmel
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
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Wild U, Federle S, Wagner A, Kaifer E, Himmel HJ. Dehydrogenative Coupling Reactions with Oxidized Guanidino-Functionalized Aromatic Compounds: Novel Options for σ-Bond Activation. Chemistry 2016; 22:11971-6. [DOI: 10.1002/chem.201602236] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Indexed: 12/13/2022]
Affiliation(s)
- Ute Wild
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Stefanie Federle
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Arne Wagner
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Elisabeth Kaifer
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Hans-Jörg Himmel
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
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Wild U, Kaifer E, Wadepohl H, Himmel HJ. Combined Oxidation, Deprotonation, and Metal Coordination of a Redox-Active Guanidine Ligand. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500597] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Chackupurakal R, Wild U, Kamm M, Wappler F, Reske D, Sakka SG. [Neuroleptic malignant syndrome : Rare cause of fever of unknown origin]. Anaesthesist 2015; 64:527-31. [PMID: 26122200 DOI: 10.1007/s00101-015-0046-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Revised: 05/06/2015] [Accepted: 05/12/2015] [Indexed: 10/23/2022]
Abstract
Neuroleptic malignant syndrome (NMS) is a possible cause of fever of unknown origin (FUO) and is a potentially fatal adverse effect of various drugs, especially of neuroleptics. First generation antipsychotics, such as received by the patient described in this article, are more likely to cause NMS than second generation antipsychotics. The key symptoms are the development of severe muscle rigidity and elevated temperature associated with the use of neuroleptic medication. Malignant catatonia (MC) is an important differential diagnosis of NMS. While neuroleptics can trigger NMS and must be immediately discontinued if NMS occurs, neuroleptic therapy represents the first line treatment for MC. This article describes the case of a patient with schizoaffective disorder where initially the diagnosis of NMS was not clear. Eventually, fever and a markedly elevated serum creatine kinase (CK) led to the correct diagnosis and the appropriate therapy with dantrolene, bromocriptine and amantadine. Furthermore, a thorough review of the currently available literature on NMS is provided.
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Affiliation(s)
- R Chackupurakal
- Klinik für Anästhesiologie und operative Intensivmedizin, Klinikum der Universität Witten/Herdecke mit Sitz in Köln, Kliniken der Stadt Köln gGmbH, Krankenhaus Merheim, Ostmerheimerstr. 200, 51109, Köln, Deutschland,
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Trumm C, Hübner O, Walter P, Leingang S, Wild U, Kaifer E, Eberle B, Himmel HJ. One- versus Two-Electron Oxidation of Complexed Guanidino-Functionalized Aromatic Compounds. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402840] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Wild U, Neuhäuser C, Wiesner S, Kaifer E, Wadepohl H, Himmel HJ. Redox-controlled hydrogen bonding: turning a superbase into a strong hydrogen-bond donor. Chemistry 2014; 20:5914-25. [PMID: 24757064 DOI: 10.1002/chem.201304882] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 02/24/2014] [Indexed: 11/10/2022]
Abstract
Herein the synthesis, structures and properties of hydrogen-bonded aggregates involving redox-active guanidine superbases are reported. Reversible hydrogen bonding is switched on by oxidation of the hydrogen-donor unit, and leads to formation of aggregates in which the hydrogen-bond donor unit is sandwiched by two hydrogen-bond acceptor units. Further oxidation (of the acceptor units) leads again to deaggregation. Aggregate formation is associated with a distinct color change, and the electronic situation could be described as a frozen stage on the way to hydrogen transfer. A further increase in the basicity of the hydrogen-bond acceptor leads to deprotonation reactions.
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Affiliation(s)
- Ute Wild
- Anorganisch-Chemisches Institut, Ruprecht-Karls Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg (Germany)
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Herrmann H, Ziesak A, Wild U, Leingang S, Schrempp D, Wagner N, Beck J, Kaifer E, Wadepohl H, Himmel HJ. Tetracyanoquinodimethane Reduction by Complexed Guanidinyl-Functionalized Aromatic Compounds. Chemphyschem 2014; 15:351-65. [DOI: 10.1002/cphc.201300862] [Citation(s) in RCA: 12] [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] [Received: 09/18/2013] [Indexed: 01/17/2023]
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Krämer C, Wild U, Hübner O, Neuhäuser C, Kaifer E, Himmel HJ. Stabilization of Complexes of Redox-Active Guanidino-Functionalized Aromatic Compounds (GFAs) by Hydrogen-Bonding. Aust J Chem 2014. [DOI: 10.1071/ch14175] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The guanidino-functionalized 1,2,4,5-tetrakis(N,N′-diisopropylguanidino)benzene could act as a redox-active switch, and reversibly forms hydrogen-bond aggregates upon two-electron oxidation. Herein the influence of hydrogen bonding on the structure and electronic properties of the first transition metal complexes of the neutral and oxidized compound are studied. Reaction with CuCl2 leads by coupled redox- and coordination processes to a dinuclear CuII complex of the dicationic guanidine, in which CuCl2– counterions are locked through strong hydrogen-bonds in positions above and below the C6 ring plane. The electronic situation in the electronic ground and excited states of this complex were analysed by quantum chemical calculations.
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Wild U, Sakka SG. [78-year-old woman with home oxygen therapy and impaired vigilance]. Dtsch Med Wochenschr 2012; 137:2641-2. [PMID: 23225188 DOI: 10.1055/s-0032-1305116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- U Wild
- Klinik für Anästhesiologie und operative Intensivmedizin, Universität Witten/Herdecke, Kliniken der Stadt Köln gGmbH, Krankenhaus Merheim
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Wild U, Kaifer E, Himmel HJ. Redox Chemistry and Group 10 Metal Complexes of Aromatic Compounds with Bulky Bicyclic Guanidino Groups. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100479] [Citation(s) in RCA: 11] [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: 11/06/2022]
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Reinmuth M, Wild U, Rudolf D, Kaifer E, Enders M, Wadepohl H, Himmel HJ. Stabilization and Activation: New Alkyl Complexes of Zinc, Magnesium and Cationic Aluminium Featuring Chelating Bisguanidine Ligands. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200900591] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [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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Kovnir K, Osswald J, Armbrüster M, Teschner D, Weinberg G, Wild U, Knop-Gericke A, Ressler T, Grin Y, Schlögl R. Etching of the intermetallic compounds PdGa and Pd3Ga7: An effective way to increase catalytic activity? J Catal 2009. [DOI: 10.1016/j.jcat.2009.03.007] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Wild U, Hübner O, Maronna A, Enders M, Kaifer E, Wadepohl H, Himmel HJ. The First Metal Complexes of the Proton Sponge 1,8-Bis(N,N,N′,N′-tetramethylguanidino)naphthalene: Syntheses and Properties. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800677] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [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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Peters A, Wild U, Hübner O, Kaifer E, Himmel HJ. Mono- and Diprotonation of the Superbasic Bisguanidine 1,2-Bis(N,N,N′,N′-tetramethylguanidino)benzene (btmgb) and PtIIand PtIVComplexes of Chelating Bisguanidines and Guanidinates. Chemistry 2008; 14:7813-21. [DOI: 10.1002/chem.200800244] [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: 11/11/2022]
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Wild U, Roquette P, Kaifer E, Mautz J, Hübner O, Wadepohl H, Himmel HJ. Synthesis and Structural Characterisation ofcis- andtrans-[(hppH)2PtCl2], [(hppH)3PtCl]+Cl– and Some New Salts of the [hppH2]+ Cation (hppH = 1,3,4,6,7,8-Hexahydro-2H-pyrimido[1,2-a]pyrimidine): The Importance of Hydrogen Bonding. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200700935] [Citation(s) in RCA: 30] [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: 11/11/2022]
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Eigner U, Holfelder M, Wild U, Bender C, Kirstahler M, Turnwald A, Witte W, Weizenegger M, Fahr A. O21 Evaluation of a rapid molecular dipstick assay for the direct detection of methicillin-resistant Staphylococcus aureus in clinical specimens. Int J Antimicrob Agents 2007. [DOI: 10.1016/s0924-8579(07)70020-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
The microstructure and electronic structure of environmentally relevant carbons such as Euro IV heavy duty diesel engine soot, soot from a black smoking diesel engine, spark discharge soot as model aerosol, commercial furnace soot and lamp black are investigated by transmission electron microscopy, electron energy-loss spectroscopy and X-ray photoelectron spectroscopy. The materials exhibit differences in the predominant bonding, which influences microstructure as well as surface functionalization. These chemical and physical properties depend on the formation history of the investigated carbonaceous materials. In this work, a correlation of the microstructure of the samples to the predominant bonding and incorporation of oxygen into the carbons is obtained. It is shown that a high amount of defects and the deviation of the carbons from a perfect graphitic structure results in a increased incorporation of oxygen and hydrogen. A correlation between the length and curvature of graphene layers with the bonding state of carbon atoms and incorporation of oxygen and hydrogen is established.
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Affiliation(s)
- J-O Müller
- Fritz-Haber-Institut der Max-Planck-Gesellschaft (European Laboratory for Catalysis and Surface Science) Faradayweg 4-6, D-14195, Berlin, Germany
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Herbert R, Wild U, Hess C, Schlögl R. Nanostrukturierte Vanadiumoxid-Modell-Katalysatoren auf Basis von mesoporösem SBA-15. CHEM-ING-TECH 2006. [DOI: 10.1002/cite.200650050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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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Soerijanto H, Rödel C, Wild U, Lerch M, Schomäcker R, Schlögl R, Ressler T. Zirconium oxynitride catalysts for ammonia decomposition. Z Anorg Allg Chem 2006. [DOI: 10.1002/zaac.200670161] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [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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Müller JO, Su DS, Jentoft RE, Wild U, Schlögl R. Diesel engine exhaust emission: oxidative behavior and microstructure of black smoke soot particulate. Environ Sci Technol 2006; 40:1231-6. [PMID: 16572780 DOI: 10.1021/es0512069] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Soot particulate collected from a Euro III heavy duty diesel engine run under black smoke conditions was investigated using thermogravimetry, transmission electron microscopy, electron energy loss spectroscopy, and X-ray photoelectron spectroscopy. The characterization results are compared with those of commercial carbon black. The onset temperature toward oxidation of the diesel engine soot in 5% O2 is 150 degrees C lower than that for carbon black. The burn out temperature for the diesel engine soot is 60 degrees C lower than that of the carbon black. The soot primary particles exhibit a core-shell structure. The shell of the soot particles consists of homogeneously stacked basic structure units. The commercial carbon lamp black is more graphitized than the diesel engine soot, whereas the diesel engine soot contains more carbon in aromatic nature than the carbon black and is highly surface-functionalized. Our findings reveal that technical carbon black is not a suitable model for the chemistry of the diesel engine soot.
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Affiliation(s)
- J O Müller
- Department of Inorganic Chemistry (European Laboratory for Catalysis and Surface Science), Fritz-Haber-Institute of the Max-Planck-Society, Faradayweg 4-6, D-14195 Berlin, Germany
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Abstract
Pd black was exposed to ethylene alone or in its mixture with hydrogen at 300 and 573 K. The samples were investigated by X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). Room temperature introduction of C(2)H(4) (also in the presence of H(2)) induced a binding-energy (BE) shift in the Pd 3d doublet and changed its full width at half-maximum (fwhm). The UPS features indicate shifting of electrons from the Pd d-band to Pd-H, Pd-C, and even Pd-OH species. Vinylidene (BE approximately 284.1 eV) may be the most abundant individual surface species on disperse Pd black, along with carbon in various stages of polymerization: "disordered C" (BE approximately 284 eV), graphite (approximately 284.6 eV), and ethylene polymer (approximately 286 eV), and also some "atomic" C (BE approximately 283.5 eV). Introduction of H(2) followed by ethylene brought about stronger changes in the state of Pd than exposure in the reverse sequence. This may indicate that the presence of some surface C may hinder the decomposition of bulk PdH. Formation of Pd hydride was blocked when ethylene was introduced prior to H(2). The C 1s intensity increased, the low-binding-energy C components disappeared, and graphitic carbon (BE approximately equal to 284.6 eV) prevailed after ethylene treatment at 573 K. The loss of the Pd surface state and "PdH" signal were observed in the corresponding valence band and UPS spectra. Hydrogen treatment at 540 K was not able to decrease the concentration of surface carbon and re-establish the near-surface H-rich state. UPS showed overlayer-type C in these samples. The interaction of Pd with components from the feed gas modified its electronic structure that is consistent with lattice strain induced by dissolution of carbon and hydrogen into Pd, as indicated by the d-band shift and the dilution of the electron density at E(F).
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Affiliation(s)
- D Teschner
- Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
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Eigner U, Schmid A, Wild U, Bertsch D, Fahr AM. Analysis of the comparative workflow and performance characteristics of the VITEK 2 and Phoenix systems. J Clin Microbiol 2005; 43:3829-34. [PMID: 16081919 PMCID: PMC1233988 DOI: 10.1128/jcm.43.8.3829-3834.2005] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [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: 11/20/2022] Open
Abstract
The VITEK 2 (bioMérieux, Marcy L'Etoile, France) and the Phoenix systems (BD Diagnostic Systems, Sparks, Md.) are automated instruments for rapid organism identification and susceptibility testing. We evaluated the workflow, the time to result, and the performance of identification and susceptibility testing of both instruments. A total of 307 fresh clinical isolates were tested: 141 Enterobacteriaceae, 22 nonfermenters, 93 Staphylococcus spp., and 51 Enterococcus spp. Manipulation time was measured in batches, each with seven isolates, for a total of 39 batches. The mean (+/- standard deviation [SD]) manipulation time per batch was 20.9 +/- 1.8 min for Phoenix and 10.6 +/- 1.0 min for VITEK 2 (P < 0.001). Mean (+/-SD) time to result for all bacterial groups was 727 +/- 162 min for Phoenix and 506 +/- 120 min for VITEK 2 (P < 0.001). Concerning identification, Phoenix and VITEK 2 yielded the same results for nonfermenters (100%), staphylococci (97%), and enterococci (100%). For 140 Enterobacteriaceae strains evaluated, 135 (96%) were correctly identified by Phoenix and 137 (98%) by VITEK 2 (P = 0.72). The overall category agreement for all isolates was 97.0% for both instruments. The minor error rate, major error rate, and very major error rate for all bacterial isolates tested were 3.0, 0.3, and 0.6 and 2.8, 0.2, and 1.7 for Phoenix and VITEK 2, respectively (P values of 0.76, 0.75, and 0.09). The VITEK 2 system required less manual manipulation time and less time than the Phoenix system to yield results.
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Affiliation(s)
- U. Eigner
- Department of Microbiology, Laboratory Group Heidelberg, D-69126 Heidelberg, Germany
| | - A. Schmid
- Department of Microbiology, Laboratory Group Heidelberg, D-69126 Heidelberg, Germany
| | - U. Wild
- Department of Microbiology, Laboratory Group Heidelberg, D-69126 Heidelberg, Germany
| | - D. Bertsch
- Department of Microbiology, Laboratory Group Heidelberg, D-69126 Heidelberg, Germany
| | - A.-M. Fahr
- Department of Microbiology, Laboratory Group Heidelberg, D-69126 Heidelberg, Germany
- Corresponding author. Mailing address: Im Breitspiel 15, D-69126 Heidelberg, Germany. Phone: 0049-6221-3432-192. Fax: 0049-6221-3432-263. E-mail:
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Veisz B, Tóth L, Teschner D, Paál Z, Győrffy N, Wild U, Schlögl R. Palladium-platinum powder catalysts manufactured by colloid synthesis. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.molcata.2005.04.064] [Citation(s) in RCA: 26] [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: 10/25/2022]
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Polleux J, Pinna N, Antonietti M, Hess C, Wild U, Schlögl R, Niederberger M. Cover Picture: Ligand Functionality as a Versatile Tool to Control the Assembly Behavior of Preformed Titania Nanocrystals (Chem. Eur. J. 12/2005). Chemistry 2005. [DOI: 10.1002/chem.200590036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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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Polleux J, Pinna N, Antonietti M, Hess C, Wild U, Schlögl R, Niederberger M. Ligand Functionality as a Versatile Tool to Control the Assembly Behavior of Preformed Titania Nanocrystals. Chemistry 2005; 11:3541-51. [PMID: 15736277 DOI: 10.1002/chem.200401050] [Citation(s) in RCA: 119] [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: 11/05/2022]
Abstract
Nanoparticle powders composed of surface-functionalized anatase crystals with diameters of about 3 nm self-organize into different structures upon redispersion in water. The assembly is directed by a small amount of a low-molecular-weight functional ligand (the "assembler") adsorbed on the surface of the nanoparticles. The ligand functionality determines the anisotropy of the resulting structures. Multidentate ligands, such as trizma ((HOCH(2))(3)CNH(2)) and serinol ((HOCH(2))(2)CNH(2)), with a chargeable terminal group preferentially induce the formation of anisotropic nanostructures several hundreds of nanometers in total length, whereas all the other investigated ligands (ethanolamine H(2)N(CH(2))(2)OH, glycine hydroxamate H(2)NCH(2)CONHOH, dopamine (OH)(2)C(6)H(3)(CH(2))(2)NH(3)Cl, tris (HOCH(2))(3)CCH(3)) mainly lead to uncontrolled agglomeration. Experimental data suggests that the anisotropic assembly is a consequence of the water-promoted desorption of the organic ligands from the {001} faces of the crystalline building blocks together with the dissociative adsorption of water on these crystal faces. Both processes induce the preferred attachment of the titania nanoparticles along the [001] direction. The use of polydentate and charged ligands to functionalize the surface of nanoparticles thus provides a versatile tool to control their arrangement on the nanoscale.
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Affiliation(s)
- Julien Polleux
- Max-Planck-Institute of Colloids and Interfaces, Colloid Chemistry, Research Campus Golm, Germany
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Wild U, Günthard HH. Untersuchung reversibler Photoprozesse durch Blitzlichtphotolyse I. Eine Blitzlichtapparatur mit Zündfunkenstrecke. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19650480512] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [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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38
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Huber JR, Wild U, Günthard HH. Untersuchung reversibler Photoprozesse durch Blitzlichtphotolyse IV. Triplettzustände des 1, 3, 6′, 8′- tetramethyl-dehydrodianthrons. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19670500311] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [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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Huber JR, Wild U, Günthard HH. Untersuchung reversibler Photoprozesse durch Blitzlichtphotolyse III. Photochromie des 1, 3, 6′,8′-Tetramethyl-dehydrodianthrons. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19670500224] [Citation(s) in RCA: 10] [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: 11/12/2022]
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40
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Wootsch A, Wild U, Schlögl R, Paál Z. Effect of K on the deactivation of model Pt black catalysts: electron spectroscopy and hexane test reaction. CATAL COMMUN 2004. [DOI: 10.1016/j.catcom.2004.05.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Baker RTK, Rodriguez N, Mastalir Á, Wild U, Schlögl R, Wootsch A, Paál Z. Platinum/Graphite Nanofiber Catalysts of Various Structure: Characterization and Catalytic Properties. J Phys Chem B 2004. [DOI: 10.1021/jp0400519] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [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)
- R. Terry K. Baker
- Catalytic Materials LLC, 1750 Washington Street, Holliston, Massachusetts 01746, Institute of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Hungary, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany, and Institute of Isotopes, Chemical Research Center, Hungarian Academy of Sciences, Post Office Box 77, Budapest, H-1525 Hungary
| | - Nelly Rodriguez
- Catalytic Materials LLC, 1750 Washington Street, Holliston, Massachusetts 01746, Institute of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Hungary, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany, and Institute of Isotopes, Chemical Research Center, Hungarian Academy of Sciences, Post Office Box 77, Budapest, H-1525 Hungary
| | - Ágnes Mastalir
- Catalytic Materials LLC, 1750 Washington Street, Holliston, Massachusetts 01746, Institute of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Hungary, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany, and Institute of Isotopes, Chemical Research Center, Hungarian Academy of Sciences, Post Office Box 77, Budapest, H-1525 Hungary
| | - Ute Wild
- Catalytic Materials LLC, 1750 Washington Street, Holliston, Massachusetts 01746, Institute of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Hungary, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany, and Institute of Isotopes, Chemical Research Center, Hungarian Academy of Sciences, Post Office Box 77, Budapest, H-1525 Hungary
| | - Robert Schlögl
- Catalytic Materials LLC, 1750 Washington Street, Holliston, Massachusetts 01746, Institute of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Hungary, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany, and Institute of Isotopes, Chemical Research Center, Hungarian Academy of Sciences, Post Office Box 77, Budapest, H-1525 Hungary
| | - Attila Wootsch
- Catalytic Materials LLC, 1750 Washington Street, Holliston, Massachusetts 01746, Institute of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Hungary, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany, and Institute of Isotopes, Chemical Research Center, Hungarian Academy of Sciences, Post Office Box 77, Budapest, H-1525 Hungary
| | - Zoltán Paál
- Catalytic Materials LLC, 1750 Washington Street, Holliston, Massachusetts 01746, Institute of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Hungary, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany, and Institute of Isotopes, Chemical Research Center, Hungarian Academy of Sciences, Post Office Box 77, Budapest, H-1525 Hungary
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Jentoft FC, Hahn A, Kröhnert J, Lorenz G, Jentoft RE, Ressler T, Wild U, Schlögl R, Häßner C, Köhler K. Incorporation of manganese and iron into the zirconia lattice in promoted sulfated zirconia catalysts. J Catal 2004. [DOI: 10.1016/j.jcat.2004.02.012] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.1] [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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Joseph Y, Krasteva N, Besnard I, Guse B, Rosenberger M, Wild U, Knop-Gericke A, Schlögl R, Krustev R, Yasuda A, Vossmeyer T. Gold-nanoparticle/organic linker films: self-assembly, electronic and structural characterisation, composition and vapour sensitivity. Faraday Discuss 2004; 125:77-97; discussion 99-116. [PMID: 14750666 DOI: 10.1039/b302678g] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.4] [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
Gold-nanoparticle/organic films were prepared via layer-by-layer self-assembly using dodecylamine-stabilised Au-nanoparticles and poly(propyleneimine) (PPI) dendrimers of generation one to five (G1-G5) or hexadecanedithiol (HDT) as linker compounds. TEM and FE-SEM images revealed that the bulk of the films consisted of nanoparticles with diameters of about 4 nm. XPS was used to study the chemical composition of the films. The C 1s and N 1s signals of an AuPPI-G4 film were interpreted qualitatively according to the dendrimer structure. The absence of the nitrogen signal in case of an AuHDT film indicated that the dodecylamine ligands were quantitatively exchanged during film assembly. About 76% of the sulfur atoms were bound to the nanoparticles. the remainder being present as free thiol (S H) groups. All films displayed linear current voltage characteristics and Arrhenius-type activation of charge transport. The conductivities of the AuPPI films decreased exponentially over approximately two orders of magnitude (6.8 x 10(-2) to 1.0 x 10(-3) ohms(-1) cm(-1)) with a five-fold increase of the dendrimer generation number. Dosing the films with solvent vapours caused their resistances to increase. Using different solvent vapours demonstrated that the sensitivity of this response was determined by the solubility properties of the linker compounds. Microgravimetric measurements showed that absorption of analyte was consistent with a Langmuir adsorption model. These measurements also revealed a linear correlation between the electrical response (deltaR/Rini) and the concentration of absorbed analyte. The absorption of d4-methanol from a saturated vapour atmosphere was studied by neutron reflectometry with an AuPPI-G4 film. This measurement indicated condensation of methanol on top of the film and a uniform distribution of the analyte across the film thickness.
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Affiliation(s)
- Yvonne Joseph
- Materials Science Laboratories, Sony International (Europe) GmbH, Hedelfinger Str. 61, D-70327 Stuttgart, Germany
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Joseph Y, Besnard I, Rosenberger M, Guse B, Nothofer HG, Wessels JM, Wild U, Knop-Gericke A, Su D, Schlögl R, Yasuda A, Vossmeyer T. Self-Assembled Gold Nanoparticle/Alkanedithiol Films: Preparation, Electron Microscopy, XPS-Analysis, Charge Transport, and Vapor-Sensing Properties. J Phys Chem B 2003. [DOI: 10.1021/jp030439o] [Citation(s) in RCA: 252] [Impact Index Per Article: 12.0] [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)
- Yvonne Joseph
- Materials Science Laboratories, Sony International (Europe) GmbH, Hedelfinger Strasse 61, D-70327 Stuttgart, Germany, and Department of Inorganic Chemistry, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Isabelle Besnard
- Materials Science Laboratories, Sony International (Europe) GmbH, Hedelfinger Strasse 61, D-70327 Stuttgart, Germany, and Department of Inorganic Chemistry, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Miriam Rosenberger
- Materials Science Laboratories, Sony International (Europe) GmbH, Hedelfinger Strasse 61, D-70327 Stuttgart, Germany, and Department of Inorganic Chemistry, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Berit Guse
- Materials Science Laboratories, Sony International (Europe) GmbH, Hedelfinger Strasse 61, D-70327 Stuttgart, Germany, and Department of Inorganic Chemistry, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Heinz-Georg Nothofer
- Materials Science Laboratories, Sony International (Europe) GmbH, Hedelfinger Strasse 61, D-70327 Stuttgart, Germany, and Department of Inorganic Chemistry, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Jurina M. Wessels
- Materials Science Laboratories, Sony International (Europe) GmbH, Hedelfinger Strasse 61, D-70327 Stuttgart, Germany, and Department of Inorganic Chemistry, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Ute Wild
- Materials Science Laboratories, Sony International (Europe) GmbH, Hedelfinger Strasse 61, D-70327 Stuttgart, Germany, and Department of Inorganic Chemistry, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Axel Knop-Gericke
- Materials Science Laboratories, Sony International (Europe) GmbH, Hedelfinger Strasse 61, D-70327 Stuttgart, Germany, and Department of Inorganic Chemistry, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Dangsheng Su
- Materials Science Laboratories, Sony International (Europe) GmbH, Hedelfinger Strasse 61, D-70327 Stuttgart, Germany, and Department of Inorganic Chemistry, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Robert Schlögl
- Materials Science Laboratories, Sony International (Europe) GmbH, Hedelfinger Strasse 61, D-70327 Stuttgart, Germany, and Department of Inorganic Chemistry, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Akio Yasuda
- Materials Science Laboratories, Sony International (Europe) GmbH, Hedelfinger Strasse 61, D-70327 Stuttgart, Germany, and Department of Inorganic Chemistry, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Tobias Vossmeyer
- Materials Science Laboratories, Sony International (Europe) GmbH, Hedelfinger Strasse 61, D-70327 Stuttgart, Germany, and Department of Inorganic Chemistry, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
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Hayashi M, Chiang CH, Liang KK, Shiu YJ, Chang CH, Wu DY, Li FY, Chang TC, Wild U, Latychevskaia TY, Lin SH. Theory of the Stark Effect on Single Molecular Spectroscopy. J CHIN CHEM SOC-TAIP 2002. [DOI: 10.1002/jccs.200200114] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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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46
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Savinova ER, Scheybal A, Danckwerts M, Wild U, Pettinger B, Doblhofer K, Schlögl R, Ertl G. Structure and dynamics of the interface between a Ag single crystal electrode and an aqueous electrolyte. Faraday Discuss 2002:181-98; discussion 229-51. [PMID: 12227569 DOI: 10.1039/b110843n] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [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 aim of this work is to elucidate the initial steps of the electrochemical oxidation of Ag(111) in alkaline electrolytes. We use electrochemical as well as ex situ (XPS) and in situ (SHG) spectroscopic techniques to reconstruct the Ag(111)/electrolyte interface as a complex dynamic entity. Moving in the direction from negative to positive potentials we first observe specific adsorption of hydroxide ions, which starts at ca. -1.1 V vs. Ag/Ag2O in 0.1 M NaOH. SHG data prove that hydroxide retains its negative charge. At -0.3 V oxidation of the surface sets in with the formation of negatively charged adsorbed oxygen species and Ag+ ions, which give rise to peaks at 528.2 +/- 0.2 eV and at 367.7 eV in the O 1s and the Ag 3d(5/2) XP spectra, respectively. Around -0.1 V the adlayer is transformed into an ordered surface oxide phase which grows via a nucleation and growth mechanism. Above the reversible Ag/Ag2O potential the 2D Ag(I) oxide transforms into a 3D Ag(I) oxide. The electrochemical oxidation is compared with the previously studied gas-phase process, demonstrating both remarkable similarities as well as some differences.
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Affiliation(s)
- Elena R Savinova
- Boreskov Institute of Catalysis, Russian Academy of Sciences, Novosibirsk.
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Wölk HJ, Wild U, Weinberg G, Pfänder N, Gomez-Romero P, Mestl G. Investigations on the Catalytic Activity of the First Silver Copper Oxide: Ag2Cu2O3. CHEM-ING-TECH 2001. [DOI: 10.1002/1522-2640(200106)73:6<667::aid-cite6671111>3.0.co;2-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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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Lenz A, Wild U. Nitrogen and phosphorus budget in rewetted fens. Water Sci Technol 2001; 44:143-148. [PMID: 11804086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A former dewatered fen was flooded for a multi-purpose landuse system including cattail production, fen protection, and water purification. These research plants with an area of 6 ha consist of three constructed surface-flow wetlands. The inflowing water is polluted by non-point sources due to intensive agriculture. The focus of this paper is the estimation of the potential of rewetted fens to reduce phosphorus and nitrogen. The dominating forms of nitrogen in the inflow are organic nitrogen and nitrate. The reduction rate is higher for nitrate than for organic nitrogen, although the nitrate reductions occur only during the summer season. If no nitrate is available for denitrification, there is a release of ammonia from the peat into the water. The main form of phosphorus in the in- and outflow is ortho-phosphate. In contrast to the values of nitrate, the concentrations of phosphorus are very regular with no significant seasonal pattern. When nitrate isn't available in the water any more, the release of phosphorus begins and the rewetted fens change from a sink for phosphorus to a source of it. Rewetted fens can be a sink for phosphorus and nitrogen with nitrate as the limiting factor. Only if denitrification can occur, can the release of ammonia and phosphorus from the peat layer be prevented.
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Affiliation(s)
- A Lenz
- Ingenieurbüro Lenz, Ringelai, Germany.
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Paál Z, Wild U, Wootsch A, Find J, Schlögl R. Surface and bulk structural response of Pt black upon its hydrogen treatment and catalytic reaction with n-hexane. Phys Chem Chem Phys 2001. [DOI: 10.1039/b007837i] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [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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50
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Paál Z, Koltai T, late) Károly Matusek (, Manoli JM, Potvin C, Muhler M, Wild U, Te´te´nyi P. Sulfur uptake and exchange, HDS activity and structure of sulfided, Al2O3 supported MoOx, PdMoOx and PtMoOx catalysts. Phys Chem Chem Phys 2001. [DOI: 10.1039/b009047f] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [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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