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  • 1
    Publication Date: 2005-11-30
    Description: Theoretical considerations of lightning phenomena and the effects of the magnetic, capacitive, and resistive components of lightning-induced voltages are discussed. A typical tracking station is analyzed from a lightning standpoint. Specific protective methods are discussed, including the implementation of high-surge-current voltage clippers for sensitive electrical and electronic circuits, grounding, counterpoises, and bonding. The safety of operating personnel is also treated as a prime consideration.
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: NASA. Goddard Space Flight Center Radio Freq. Interference Handbook; p 199-253
    Format: text
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  • 2
    ISSN: 0044-2313
    Keywords: Cobalt (nickel) complexes ; bis(2-pyridinamine) adducts of MII bis(acetylacetonate) ; carbonate ; acetylacetonate hydrogencarbonate ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 2-Pyridinamine Adducts of Transition Metal Bis(acetylacetonates) and their Reactions. Hydrogencarbonate as a Chelating Ligand in cis-(Ampy)2Co(acac)(HCO3)The reaction of cobalt(II) salts, acetylacetone (acacH), 2-pyridinamine (Ampy), and the carbon dioxide of the air in methanol affords a mixture of (Ampy)2Co(acac)2(II) and (Ampy)2Co(CO3)(H2O)2. On heating in toluene, appropriately in the presence of carbon dioxide, these complexes are converted into cis-(Ampy)2Co(acac)(HCO3) (III). Characteristic of compound III is a four-membered ring with the hydrogencarbonate as a bidentate ligand. The two Co—O distances are distinctly different (215.9 and 224.4 pm).In the complexes II and III 2-pyridinamine is a bidentate ligand coordinating by the endo-nitrogen. The Co-n-N bond lengths vary between 210.9 and 225.3 pm. Reasons are both the different trans-influence of the hydrogencarbonate or the acetylacetonato donor atoms and the π-interaction between cobalt(II) and the pyridine ring. This interaction is more significant in the cis-complex III. II and III are stabilized by a system of N—H … O- and O—H …O-bridges.With nickel(II) complexes analogous to II and III were obtained, while only the type II was characterized for manganese(II).
    Notes: Die Umsetzung von Cobalt(II)-Salzen mit Acetylaceton (acacH), 2-Pyridinamin (Ampy) und dem Kohlendioxid der Luft in Methanol gibt ein Gemisch von trans-(ampy)2Co(acac)2(II) und (Ampy)2Co(CO3)(H2O)2. Beim Erhitzen in Toluen, zweckmäßigerweise unter Durchleiten von Kohlendioxid, setzen sich diese Komplexe zu cis-(Ampy)2Co(acac)(HCO3)(III) um.Für III ist ein viergliedriger Chelatring mit dem Hydrogencarbonat als zweizähligem Liganden charakteristisch, die beiden Co—O-Abstände sind deutlich verschieden (215,9 und 224,4 pm).In II und III ist Ampy einzählig und koordiniert über den endo-Stickstoff. Die Co—N-Abstände variieren von 210,9 bis 225,3 pm. Differenzierende Faktoren sind der unterschiedliche Transeinfluß von Hydrogencarbonat-bzw. Acetylacetonathaftatomen, aber auch die π-Wechselwirkung zwischen dem Zentralatom und dem Pyridinring, die beim cis-Komplex III stärker als beim trans-Komplex II ausgeprägt ist. Die Verbindungen II und III werden durch ein System von N—H … O-und O—H … O-Brücken stabilisiert.Im Falle des Nickels wurden die zu II und III analogen Komplexe erhalten, bei Mangan(II) konnte dagegen nur der Typ II realisiert werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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