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  • 1
    Electronic Resource
    Electronic Resource
    Zur Existenz zwitterionischer λ5-(Ammonioorganyl)tetrafluorosilicate: Synthese sowie Kristall- und Molekülstruktur von Tetrafluoro(pyrrolidiniomethyl)silicat (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 2015-2018 
    Details
    ISSN: 0009-2940
    Keywords: Fluorosilicates, zwitterionic ; Pentacoordinate silicon ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Existence of Zwitterionic λ5-(Ammonioorganyl)tetrafluorosilicates: Synthesis and Crystal and Molecular Structure of Tetrafluoro(pyrrolidiniomethyl)silicateThe zwitterionic tetrafluoro(pyrrolidiniomethyl)silicate (6) was synthesized by the reaction of trimethoxy(pyrrolidinomethyl)silane (7) with hydrogen fluoride in ethanol/hydro-fluoric acid (yield 83%). 6 crystallizes in the space group P1/c with two crystallographically distinct molecules in the asymmetric unit. In both molecules the pentacoordinate silicon atom is surrounded by four fluorine atoms and one carbon atom, the latter being in an equatorial position. The coordination polyhedron of the silicon atoms can be described as a slightly distorted trigonal bipyramid. The zwitterionic structure was also proved for dissolved 6 (solution in CD3CN, NMR-spectroscopic studies).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250907
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  • 2
    Electronic Resource
    Electronic Resource
    A Zwitterionic Pentacoordinate Silicon Compound with an SiO2N2C Framework (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 415-418 
    Details
    ISSN: 1434-1948
    Keywords: Pentacoordinate silicon ; Zwitterionic λ5Si-silicate ; SiO2N2C framework ; Hypervalent compounds ; Main-group elements ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of (Me2N)3SiCH2CH2NMe2 with 2-amino-4-nitrophenol (molar ratio 1:2) in acetonitrile yields the zwitterionic spirocyclic λ5Si-silicate [2-(dimethylammonio)ethyl]bis[4-nitrobenzene-2-aminato-1-olato(2-)]silicate (7). Compound 7 was characterized by 1H, 13C, and 29Si solution-state and 29Si solid-state NMR spectroscopy, in addition to single-crystal X-ray diffraction. The SiO2N2C framework of 7 is characterized by five „normal” covalent bonds.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Syntheses, Stereochemistry, and Dynamic Behavior of Chiral Zwitterionic (Ammoniomethyl)bis[glycolato(2-)-O1,O2]silicates (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 795-805 
    Details
    ISSN: 1434-1948
    Keywords: Ab initio studies ; Chirality ; Pentacoordinate silicon ; Stereochemistry ; Zwitterionic λ5Si-silicates ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The syntheses of the zwitterionic (molecular) spirocyclic λ5Si-silicates 5-9 are described. These chiral compounds contain a pentacoordinate (formally negatively charged) silicon atom and a tetracoordinate (formally positively charged) nitrogen atom. The stereochemistry and dynamic behavior of 5-9 were investigated. For this purpose, compounds 5-9 were studied by solution-state NMR spectroscopy (1H, 13C, 29Si; including VT 1H-NMR studies of 9) and solid-state NMR spectroscopy (13C CP/MAS, 29Si CP/MAS). In addition, compounds 5·H2O, 7, 8, 9·H2O, and 9·2CH3CN were structurally characterized by single-crystal X-ray diffraction, and ab initio investigations of the zwitterion 8 and the related anionic model species 10 were carried out.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New Chiral Zwitterionic λ5Si-Silicates with an SiO5 or SiO4C Framework: Syntheses, Crystal Structures, and Properties (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 807-816 
    Details
    ISSN: 1434-1948
    Keywords: Ab initio studies ; Chirality ; Pentacoordinate silicon ; Stereochemistry ; Zwitterionic λ5Si-silicates ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The syntheses of the zwitterionic (molecular) spirocyclic λ5Si-silicates 7 and 8 (SiO5 skeletons) and 10-12 (SiO4C skeletons) are described. These chiral compounds contain a pentacoordinate (formally negatively charged) silicon atom and a tetracoordinate (formally positively charged) nitrogen atom. The pairs 7/11 and 8/12 are isoelectronic O/CH2 analogues and 10-12 represent a series of homologous compounds containing different alkylene spacers that connect the ate and onium center of these zwitterions. Compound 7, 8, and 10-12 were studied by single-crystal X-ray diffraction, solution-state (1H, 13C, 29Si) and solid-state (29Si CP/MAS) NMR spectroscopy, and VT 1H-NMR spectroscopy. The experimental investigations were completed by ab initio studies of the related anionic λ5Si-silicate 13.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesen und Kristallstrukturanalysen neuer zwitterionischer spirocyclischer (Ammonioorganyl)bis[vic-arendiolato(2-)]silicate: Untersuchungen zur Struktur der λ5Si-KoordinationspolyederProfessor Gerhard Fritz zum 75. Geburtstag gewidmet (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 779-788 
    Details
    ISSN: 0044-2313
    Keywords: Pentacoordinate silicon ; zwitterionic λ5Si-spirosilicate ; 29Si-CP/MAS NMR ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses and Crystal Structure Analyses of New Zwitterionic Spirocyclic (Ammonioorganyl)bis[vic-arenediolato(2-)]silicates: Studies on the Structure of the λ5Si Coordination PolyhedraA new crystallographic modification (1-II) of the zwitterionic λ5Si-spirosilicate [2-(pyrrolidinio)ethyl]bis[3,4,5,6-tetrabromobenzene-1,2-diolato(2 - )]silicate (1) was synthesized. In addition, two solvent-free crystallographic modifications (2-I, 2-II) and two solvates (2 · Me2CO, 2 λ MeNO2) of the zwitterionic λ5Si-spirosilicate [(morpholinio)methyl]bis[2,3-naphthalenediolato(2 - )]silicate (2) were prepared. All new compounds were studied by 29Si-CP/MAS NMR spectroscopy and compounds 1-II (Pna21), 2 · Me2CO (P21/c), and 2 · MeNO2 (P21/n) were structurally characterized by single-crystal X-ray diffraction.
    Notes: Eine neue kristallographische Modifikation (1-II) des zwitterionischen λ5Si-Spirosilicats [2-(Pyrrolidinio)-ethyl]bis[3,4,5,6-tetrabrombenzol-1,2-diolato(2 - )]silicat (1) wurde synthetisiert. Außerdem wurden zwei lösungsmittelfreie kristallographische Modifikationen (2-I, 2-II) und zwei Solvate (2 · Me2CO, 2 · MeNO2) des zwitterionischen λ5Si-Spirosilicats [(Morpholinio)methyl]bis[2,3-naphthalindiolato(2 - )]silicat (2) dargestellt. Alle neu synthetisierten Verbindungen wurden mittels 29Si-CP/MAS-NMR-Spektroskopie untersucht und die Verbindungen 1-II (Pna21), 2 · Me2CO (P21/c) und 2 · MeNO2 (P21/n) mittels Einkristall-Röntgenstrukturanalyse strukturell charakterisiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210515
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