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  1. Article ; Online: The First Year of B. Sc. Chemistry at the University of Freiburg, Germany

    Ingo Krossing

    CHIMIA, Vol 75, Iss 1/2, Pp 9-

    A Report from the Experimental Lecture on General and Inorganic Chemistry

    2021  Volume 13

    Abstract: The organization, content and rationale behind the ' Experimental Lecture General and Inorganic Chemistry ' as well as its theoretical ' Consolidation Lecture ' companion as the first contact of students in the B. Sc. program in Chemistry and Chemical ... ...

    Abstract The organization, content and rationale behind the ' Experimental Lecture General and Inorganic Chemistry ' as well as its theoretical ' Consolidation Lecture ' companion as the first contact of students in the B. Sc. program in Chemistry and Chemical Education as well as several others, i.e. Pharmacy, Geosciences, Molecular Medicine and Physics is described. To cope with the multifaceted demands on this first semester lecture series by several faculties, the experimental lecture is attended also by students from other fields. The companion lecture that addresses the advanced needs of chemists, consolidates the content of the experimental lecture by going more into detail and extends on the theories/concepts/reactions. An integrated interplay between experiment and theory is realized in our specially equipped lecture hall.
    Keywords bsc chemistry ; experimental lecture general and inorganic chemistry ; general chemistry ; Chemistry ; QD1-999
    Subject code 540
    Language German
    Publishing date 2021-02-01T00:00:00Z
    Publisher Swiss Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Metal–CO Bonding in Mononuclear Transition Metal Carbonyl Complexes

    Gernot Frenking / Israel Fernández / Nicole Holzmann / Sudip Pan / Ingo Krossing / Mingfei Zhou

    JACS Au, Vol 1, Iss 5, Pp 623-

    2021  Volume 645

    Keywords Chemistry ; QD1-999
    Language English
    Publishing date 2021-04-01T00:00:00Z
    Publisher American Chemical Society
    Document type Article ; Online
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  3. Article ; Online: Stable salts of the hexacarbonyl chromium(I) cation and its pentacarbonyl-nitrosyl chromium(I) analogue

    Jan Bohnenberger / Wolfram Feuerstein / Daniel Himmel / Michael Daub / Frank Breher / Ingo Krossing

    Nature Communications, Vol 10, Iss 1, Pp 1-

    2019  Volume 8

    Abstract: Carbonyl complexes have been studied extensively thanks to their rich substitution and redox chemistry, but most homoleptic transition metal carbonyl complexes isolated in the condensed phase are neutral or anionic. Here, the authors isolate two ... ...

    Abstract Carbonyl complexes have been studied extensively thanks to their rich substitution and redox chemistry, but most homoleptic transition metal carbonyl complexes isolated in the condensed phase are neutral or anionic. Here, the authors isolate two homoleptic carbonyl radical cations in the condensed phase; both 17-electron [Cr(CO)6]•+ salts.
    Keywords Science ; Q
    Language English
    Publishing date 2019-02-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
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  4. Article ; Online: Stable salts of the hexacarbonyl chromium(I) cation and its pentacarbonyl-nitrosyl chromium(I) analogue

    Jan Bohnenberger / Wolfram Feuerstein / Daniel Himmel / Michael Daub / Frank Breher / Ingo Krossing

    Nature Communications, Vol 10, Iss 1, Pp 1-

    2019  Volume 8

    Abstract: Carbonyl complexes have been studied extensively thanks to their rich substitution and redox chemistry, but most homoleptic transition metal carbonyl complexes isolated in the condensed phase are neutral or anionic. Here, the authors isolate two ... ...

    Abstract Carbonyl complexes have been studied extensively thanks to their rich substitution and redox chemistry, but most homoleptic transition metal carbonyl complexes isolated in the condensed phase are neutral or anionic. Here, the authors isolate two homoleptic carbonyl radical cations in the condensed phase; both 17-electron [Cr(CO)6]•+ salts.
    Keywords Science ; Q
    Language English
    Publishing date 2019-02-01T00:00:00Z
    Publisher Nature Publishing Group
    Document type Article ; Online
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  5. Article: The perfluorinated alcohols c-C6F11OH, c-C6F10-1,1-(OH)2 and c-C6F10-1-(CF3)OH

    Schaab, Jonas / Daniel Kratzert / Hans-Georg Stammler / Ingo Krossing / Jan Schwabedissen / Miriam Schwab / Norbert W. Mitzel

    Chemical communications. 2018 Aug. 16, v. 54, no. 67

    2018  

    Abstract: The thermally unstable α-fluoroalcohol undecafluorocyclohexanol (c-C6F11OH) was prepared by addition of hydrogen fluoride to the corresponding ketone. c-C6F10(CF3)OH was obtained by protonation of its alkoxide [NMe4]+[C7F13O]−. Decafluorocyclohexane-1,1- ... ...

    Abstract The thermally unstable α-fluoroalcohol undecafluorocyclohexanol (c-C6F11OH) was prepared by addition of hydrogen fluoride to the corresponding ketone. c-C6F10(CF3)OH was obtained by protonation of its alkoxide [NMe4]+[C7F13O]−. Decafluorocyclohexane-1,1-diol (c-C6F10(OH)2) was prepared by acidic workup of the corresponding alkoxide [NMe4]+[C6F11O]− with sulfuric acid, which yielded (c-C6F10(OH)2) and fluorosulfonic acid. The structures of c-C6F10(CF3)OH·2H2O and of (c-C6F10(OH)2) were elucidated by single-crystal X-ray and gas-phase electron-diffraction studies.
    Keywords alcohols ; gases ; hydrofluoric acid ; hydroxyl radicals ; protonation ; sulfuric acid ; X-radiation
    Language English
    Dates of publication 2018-0816
    Size p. 9294-9297.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/c8cc05148h
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Ab initio study of CO2 hydrogenation mechanisms on inverse ZnO/Cu catalysts

    Reichenbach, Thomas / Krishnakanta Mondal / Marc Jäger / Thomas Vent-Schmidt / Daniel Himmel / Valentin Dybbert / Albert Bruix / Ingo Krossing / Michael Walter / Michael Moseler

    Journal of catalysis. 2018 Apr., v. 360

    2018  

    Abstract: Methanol formation from CO2 and molecular hydrogen on ZnO/Cu catalysts is studied by gradient corrected density functional theory. The catalytically active region is modeled as a minimum size inverse catalyst represented by ZnXOY(H) clusters of different ...

    Abstract Methanol formation from CO2 and molecular hydrogen on ZnO/Cu catalysts is studied by gradient corrected density functional theory. The catalytically active region is modeled as a minimum size inverse catalyst represented by ZnXOY(H) clusters of different size and a ZnO nano-ribbon on an extended Cu(111) surface. These systems are chosen as a representative of thermodynamically stable catalyst structures under typical reaction conditions. Comparison to a high level wave function method reveals that density functional theory systematically underestimates reaction barriers, but nevertheless conserves their energetic ordering. In contrast to other metal-supported oxides like ceria and zirconia, the reaction proceeds through the formation of formate on ZnOX/Cu, thus avoiding the CO intermediate. The difference between the oxides is attributed to variance in the initial activation of CO2. The energetics of the formate reaction pathway is insensitive to the exact environment of undercoordinated Zn active sites, which points to a general mechanism for Cu-Zn based catalysts.
    Keywords active sites ; carbon dioxide ; catalysts ; copper ; density functional theory ; formates ; hydrogen ; hydrogenation ; methanol ; nanomaterials ; thermodynamics ; zinc ; zinc oxide ; zirconium oxide
    Language English
    Dates of publication 2018-04
    Size p. 168-174.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 1468993-5
    ISSN 0021-9517
    ISSN 0021-9517
    DOI 10.1016/j.jcat.2018.01.035
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  7. Article: Supersilylverbindungen Der Borgruppenelemente, IV [1]. Supersilylelementhalogenide tBu3SIEX2 Und (tBu3Si)2Ex Mit E = Al, Ga, In: Synthesen, Eigenschaften, Strukturen [2] / Supersilylated Compounds of the Thirteenth Group, IV [I]. Supersilylelement Halides tBu3SIEX2 And (tBu3Si)2Ex with E = Al, Ga, In: Syntheses, Properties, Structures [2]

    Wiberg, Nils / Kerstin Amelunxen / Hans-Wolfram Lemer / Heinrich Nöth / Jörg Knizek / Ingo Krossing

    Zeitschrift für Naturforschung. 2014 June 2, v. 53, no. 3

    2014  

    Abstract: Water and oxygen sensitive compounds (tBu₃SiEX₂)2, tBu₃SiEX₂ Do and (tBu₃Si)2EX (E = AI, Ga, In; X = (F), Cl, Br; Do = OR₂, NR₃) have been synthezised by reaction of EX₃ with tBu₃SiNa in the absence or presence of donors. In addition, (tBu₃Si)AlBr₂, (tBu₃ ...

    Abstract Water and oxygen sensitive compounds (tBu₃SiEX₂)2, tBu₃SiEX₂ Do and (tBu₃Si)2EX (E = AI, Ga, In; X = (F), Cl, Br; Do = OR₂, NR₃) have been synthezised by reaction of EX₃ with tBu₃SiNa in the absence or presence of donors. In addition, (tBu₃Si)AlBr₂, (tBu₃Si)₂InF and tBu₃SiInBr₂ were prepared by reaction of AlBr₃ with (tBu₃Sij₂Zn or of (tBu₃Si)₂In- In(Si/Bu₃)₂ with AgF₂ and HBr, respectively. The adduct [tBu₃SiAlBr₂ · AlBr₃ ·1/2MgBr₂]₂ is formed from AlBr₃ and (tBu₃Si)₂Mg(THF)₂. Thermal decomposition of the compounds in solution or in the gas phase leads to the formation of tBu₃SiEX₂ (from the dimers or the donor adducts) and of tBu₃SiX. The Lewis acidity of tBu₃SiEX₂ against donors increases in the direction Do = Et₂O < THF < NEtMe₂. Dehalogenation of (tBu₃Si)₂ECl with tBu₃SiNa(THF)₂ in pentane at room temperature leads to clusters (tBu₃Si)₄Al₂, (tBu₃Si)₃Ga₂•, (tBu₃Si)₄In₂ and (tBu₃Si)₃Ga₂Na(THF)₃, reduction of tBu₃SiGaCl₂ with Na or K in heptane at 100°C to the tetrahedran (tBu₃Si)₄Ga₄. The structures of (tBu₃SiGaCl₂)₂, (tBu₃Si)₂GaCl, and [tBu₃SiAlBr₂ AlBr₃ ·1/2MgBr₂]₂ have been determined by X-ray structure analysis.
    Keywords X-radiation ; acidity ; aluminum ; ambient temperature ; bromine ; dehalogenation ; fluorine ; gases ; halides ; heptane ; hydrobromic acid ; oxygen ; pentane ; potassium ; sodium ; thermal degradation
    Language English
    Dates of publication 2014-0602
    Size p. 333-348.
    Publishing place Verlag der Zeitschrift für Naturforschung
    Document type Article
    ZDB-ID 124635-5
    ISSN 0340-5087 ; 0044-3174 ; 0932-0776 ; 0341-0447 ; 0341-0420
    ISSN 0340-5087 ; 0044-3174 ; 0932-0776 ; 0341-0447 ; 0341-0420
    DOI 10.1515/znb-1998-0312
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: Chasing an Elusive Alkoxide

    Lutz O. Müller / Rosario Scopelliti / Ingo Krossing

    CHIMIA, Vol 60, Iss

    Attempts to Synthesize [OC(tBu)(CF3)2]?

    2006  Volume 4

    Abstract: The synthesis of the alkoxide [OC(tBu)(CF3)2]? by the reaction of tBuM-reagents (M = Li; MgX) with hexafluoroacetone was attempted. This alkoxide was anticipated to be a good building block for novel weakly coordinating anions. However, in all attempted ... ...

    Abstract The synthesis of the alkoxide [OC(tBu)(CF3)2]? by the reaction of tBuM-reagents (M = Li; MgX) with hexafluoroacetone was attempted. This alkoxide was anticipated to be a good building block for novel weakly coordinating anions. However, in all attempted syntheses – also supported by theoretical DFT calculations – it was shown that [H]? addition is favored over [tBu]? addition. Thus compounds like [(Li(OC(H)(CF3)2]4·2Et2O (1) and (CF3)2(H)COMgCl·(OEt2)2 (4) were formed. An unexpected result was the formation of (THF)3LiO(CF3)2OC(H)(CF3)2(2), an addition compound built from [(CF3)2C(H)O]? and hexafluoroacetone. The alkoxy-alkoxide 2 could be useful for further applications.
    Keywords Alkoxide ; Dft ; Weakly coordinating anion (wca) ; Chemistry ; QD1-999
    Language German
    Publishing date 2006-04-01T00:00:00Z
    Publisher Swiss Chemical Society
    Document type Article ; Online
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