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  • 1995-1999  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 719-724 
    ISSN: 0044-2313
    Keywords: Undecahydroaza-nido-undecaborate(2-) ; azametalla-closo-dodecaboranes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Azametalla-closo-dodecaboraneAus nido-NB10H13 erhält man mit der doppelten Menge an K[BHEt3] das Azaborat K2[nido-NB10H11]. Das Anion [NB10H112-] ist isoelektronisch mit [C2B9H11]2-. Es reagiert mit [{η6-(C6R6)RuCl2}2] (R = H, Me), [{η5-(C5Me5)RhCl2}2] oder [Ni(PPh3)2Cl2] zu den Azametalla-closo-dodecaboranen MNB10H11 mit M = (C6Me6)Ru (2), (C6H6)Ru (3), (C5Me5)Rh (4) bzw. (Ph3P)2Ni (5). Aus K2[NB10H11] und CoCl2 läßt sich das Azametallaboran K[Co(NB10H11)2] (6) gewinnen, in welchem das Co-Atom sandwichartig von zwei [NB10H11]2--Ionen koordiniert wird. Vom Produkt 2 · CH2Cl2 liegt eine Röntgenstrukturanalyse vor. Die Produkte 2-6 lassen sich vom ikosaedrisch gebauten Anion [B12H12]2- dadurch ableiten, daß eine BH2--Einheit durch das isoelektronische Nitren NH und eine BH-Einheit durch das isolobale Metallkomplex-Fragment M ersetzt werden. Das N-Atom ist in den Clustergerüsten 2-6 jeweils sechsfach koordiniert.
    Notes: The azaborate K2[nido-NB10H11] is gained from nido-NB10H13 and K[BHEt3] in a 1:2 ratio. The anion [NB10H11]2-, which is isoelectronic with [C2B9H11]2-, reacts with [{η6-(C6R6) · RuCl2}2] (R = H, Me), [{η5-(C5Me5)RhCl2}2], or [Ni(PPh3)2Cl2] to give the azametalla-closo-dodecaboranes MNB10H11 with M = (C6Me6)Ru (2), (C6H6)Ru (3), (C5Me5)Rh (4), and (Ph3P)2Ni (5), respectively. The azametallaborane K[Co(NB10H11)2] (6), which contains a sandwich-type coordinated Co atom, is formed from K2[NB10H11] and CoCl2. The structure of 2 · CH2Cl2 was determined by X-ray diffraction. The products 2-6 can be derived from the icosahedral anion [B12H12]2- on replacing a BH2- moiety by the isoelectronic nitrene NH and a BH moiety by the isolobal metal-complex fragment M. The N atom is six-coordinated in the cluster skeletons 2-6.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
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    Wiley-VCH
    In:  In: Methods of Seawater Analysis. , ed. by Grasshoff, K., Kremling, K. and Ehrhardt, M. Wiley-VCH, Weinheim, Germany, pp. 399-405. 3. edition ISBN 3-527-29589-5
    Publication Date: 2020-04-01
    Type: Book chapter , NonPeerReviewed
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  • 3
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    Wiley-VCH
    In:  In: Methods of Seawater Analysis. , ed. by Grasshoff, K., Kremling, K. and Ehrhardt, M. Wiley-VCH, Weinheim, Germany, pp. 159-228. 3 ISBN 3-527-29589-5
    Publication Date: 2020-04-02
    Type: Book chapter , PeerReviewed
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  • 4
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    Wiley-VCH
    In:  In: Methods of Seawater Analysis. , ed. by Grasshoff, K., Kremling, K. and Ehrhardt, M. Wiley-VCH, Weinheim, pp. 75-89. 3. edition ISBN 3-527-29589-5
    Publication Date: 2020-04-01
    Type: Book chapter , NonPeerReviewed
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  • 5
    Publication Date: 2017-10-05
    Description: Water samples from surface and bottom waters of two bights of the Baltic Sea were analysed for dissolved and/or particulate concentrations of Al, Cd, Co, Cu, Fe, Hg, Mn, Ni, Pb and Zn, in addition to the main oceanographic variables, at 27 stations during six cruises between February 1990 and July 1992. The metal values show distinct regional differences, with maximum concentrations at the near-shore stations, The levels of total Hg exhibit a significant negative relationship with salinity. In surface layers, seasonal differences due to biogenic uptake of elements could not be detected for any of the dissolved metals. In bottom waters, however, summer-time concentrations of a number of metals are in clear excess of winter levels either due to diffusion of metals (Go, Fe, Mn) from the sediments under low-oxygen or anaerobic conditions, or due to mineralization processes (Cd, Zn) of recently sedimented biogenic particulates. With the exception of Fe and Pb, the particulate fractions are of minor importance, with slight variabilities between the seasons only. The K-D values (ratio between metal concentrations in the particulate and dissolved fractions) decrease by more than two orders of magnitude in the order Fe-Pb-Mn-Co-Zn-Cd-Cu-Ni. Finally, the results are discussed with regard to a trace metal monitoring programme in the area.
    Type: Article , PeerReviewed
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  • 6
    Publication Date: 2019-09-23
    Description: The seasonal development of oxygen concentrations in the deep water of a nearly permanently stratified station in Kiel Eight, which originates from inflows through the Great Belt and the Kattegat, was investigated. The bottom-water oxygen situation of an individual year was characterized by the apparent oxygen consumption rate from day 80 to day 260. The estimated consumption is poorly correlated with pelagic variables measured during the same year (winter-nutrient concentrations, DON, primary productivity, etc.). For the period 1979-1996, a significant correlation was found between oxygen consumption and average precipitation during the preceding 8 months (June-January). It is suggested that a considerable part of the production is transferred into the next year as particulate organic pool accumulated in, or on top of, the sediment rather than being immediately recycled.
    Type: Article , PeerReviewed
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