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  • 157-2; 204-1247B; 204-1248C; 204-1249C; 204-1250C; Bush Hill; DEPTH, sediment/rock; Depth comment; DRILL; Drilling/drill rig; Elevation of event; Event label; Grain size, mean; Joides Resolution; Latitude of event; Leg204; Location scan method; Longitude of event; North Pacific Ocean; Ocean Drilling Program; ODP; OTEGA II; Sample code/label; SO174/2; SO174/2_157-2; Sonne; Standard deviation; Television-Grab; TVG  (1)
  • Pentacoordinate silicon
  • Fluorosilicates, zwitterionic
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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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    Paper (German National Licenses)
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  • 2
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    Unknown
    (Table 1) Crystal sizes of measured samples (2007)
    PANGAEA
    In:  Supplement to: Klapp, Stephan A; Klein, Helmut; Kuhs, Werner F (2007): First determination of gas hydrate crystallite size distributions using high-energy synchrotron radiation. Geophysical Research Letters, 34, L13608, https://doi.org/10.1029/2006GL029134
    Details
    Publication Date: 2024-01-09
    Description: Due to experimental difficulties grain size distributions of gas hydrate crystallites are largely unknown in natural samples. For the first time, we were able to determine grain size distributions of six natural gas hydrates for samples retrieved from the Gulf of Mexico and from Hydrate Ridge offshore Oregon from varying depths. High-energy synchrotron radiation provides high photon fluxes as well as high penetration depth and thus allows for investigation of bulk sediment samples. The gas hydrate crystallites appear to be (log-) normally distributed in the natural samples and to be of roughly globular shape. The mean grain sizes are in the range from 300–600 µm with a tendency for bigger grains to occur in greater depth, possibly indicating a difference in the formation age. Laboratory produced methane hydrate, starting from ice and aged for 3 weeks, shows half a log-normal curve with a mean value of ~40 µm. This one order-of-magnitude smaller grain sizes suggests that care must be taken when transposing grain-size sensitive (petro-)physical data from laboratory-made gas hydrates to natural settings.
    Keywords: 157-2; 204-1247B; 204-1248C; 204-1249C; 204-1250C; Bush Hill; DEPTH, sediment/rock; Depth comment; DRILL; Drilling/drill rig; Elevation of event; Event label; Grain size, mean; Joides Resolution; Latitude of event; Leg204; Location scan method; Longitude of event; North Pacific Ocean; Ocean Drilling Program; ODP; OTEGA II; Sample code/label; SO174/2; SO174/2_157-2; Sonne; Standard deviation; Television-Grab; TVG
    Type: Dataset
    Format: text/tab-separated-values, 26 data points
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