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  • 1990-1994  (3)
  • Inorganic Chemistry  (2)
  • Beech forest  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Hexosamines in the organic layer of two beech forest soils: effects of mesofauna exclusion (1993)
    Springer
    Biology and fertility of soils 15 (1993), S. 301-307 
    Details
    ISSN: 1432-0789
    Keywords: Mesofauna ; Amino sugar ; Soil micro-flora ; Beech forest ; Moder ; Lime
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In December 1988, litter bags (mesh size: 45 and 1000 μm) were exposed in the organic layer of unlimed and limed moder soil under beech forest in the Solling area of Germany. Bags were retrieved on three sampling dates (May, September, and November 1989) and amounts (g m-2) of glucosamine and galactosamine were determined. Horizon-specific differences generally explained by far the largest part of the treatment variance. In the substrate sampled in December 1988 from the unlimed area glucosamine increased by a factor of 11.8 from the L 1 layer to the H layer and galactosamine by a factor of 15.9. With the exception of the F2 layer, the hexosamine amounts found in the limed substrate sampled in December 1988 were higher in all horizons than in the corresponding horizons sampled from the unlimed area. Exclusion of mesofauna from the 45-μm litter bags generally reduced the level of amino sugars at both sites. The difference between the two mesh sizes was most pronounced in the lowermost horizons (F2 and H) and quite small in the upper horizons. The exclusion of mesofauna significantly increased the glucosamine: galactosamine ratio in the two L layers of the unlimed soil on all sampling dates. Seasonal fluctuations suggested that the actual amino sugar content of the organic layer was essentially the function of two components, the first reflecting long-term accumulation of microbial metabo-lites, and the second reflecting short term fluctuations in the microbial colonization of various C sources together with spatial and temporal differences in the ability of the microflora to produce and to decompose hexosamines. The results of this study show that the mesofauna in the beech forest soils investigated significantly affected both the amino sugar components measured, and thus stimulated the accumulation of one of the most important N pools in forest soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00337217
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Synthese und dynamisches Verhalten von [Rh2(μ-H)3H2(PiPr3)4]+. Beiträge zur Reaktivität des Tetrahydridodirhodium-Komplexes [Rh2H4(PiPr3)4]Professor Wilhelm Preetz zum 60. Geburtstage gewidmet (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1157-1162 
    Details
    ISSN: 0044-2313
    Keywords: Hydridorhodium complexes ; reactions with CO and methanol ; synthesis of a carbonyl(methyl)rhodium(I) complex ; protonation reactions ; intramolecular rearrangement ; nitrosylrhodium complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Dynamic Behaviour of [Rh2(μ-H)3H2(PiPr3)4]+. Contributions to the Reactivity of the Tetrahydridodirhodium Complex [Rh2H4(PiPr3)4]An improved synthesis of [Rh2H4(PiPr3)4] (2) from [Rh(η3-C3H5)(PiPr3)2] (1) or [Rh(η3-CH2C6H5)(PiPr3)2] (3) and H2 is described. Compound 2 reacts with CO or CH3OH to give trans-[RhH(CO)(PiPr3)2] (4) and with ethene/acetone to yield a mixture of 4 and trans-[RhCH3(CO)(PiPr3)2] (5). The carbonyl(methyl) complex 5 has also been prepared from trans-[RhCl(CO)(PiPr3)2] (6) and CH3MgI. Whereas the reaction of 2 with two parts of CF3CO2H leads to [RhH2(η2-O2CCF3) · (PiPr3)2] (8), treatment of 2 with one equivalent of CF3CO2H in presence of NH4PF6 gives the dinuclear compound [Rh2H5(PiPr3)4]PF6 (9a). The reactions of 2 with HBF4 and [NO]BF4 afford the complexes [Rh2H5(PiPr3)4]BF4 (9b) and trans-[RhF(NO)(PiPr3)2]BF4 (11), respectively. In solution, the cation [Rh2(μ-H)3H2(PiPr3)4]+ of the compounds 9a and 9b undergoes an intramolecular rearrangement in which the bridging hydrido and the phosphane ligands are involved.
    Notes: Es wird über eine verbesserte Synthese von [Rh2H4(PiPr3)4] (2) aus [Rh(η3-C3H5)(PiPr3)2] (1) oder [Rh(η3CH2C6H5)(PiPr3)2] (3) und H2 berichtet. Verbindung 2 reagiert mit CO oder CH3OH zu trans-[RhH(CO)(PiPr3)2] (4) und mit Ethen/Aceton zu einem Gemisch von 4 und trans-[RhCH3(CO) · (PiPr3)2] (5). Der Carbonyl(methyl)-Komplex 5 ist ebenfalls aus trans-[RhCl(CO)(PiPr3)2] (6) und CH3MgI erhältlich. Während die Reaktion von 2 mit zwei Teilen CF3CO2H zu [RhH2(η2O2CCF3)(PiPr3)2] (8) führt, entsteht aus 2 und einem Äquivalent CF3CO2H in Gegenwart von NH4PF6 die zweikernige Verbindung [Rh2H5(PiPr3)4]PF6 (9a). Die Umsetzungen von 2 mit HBF4 und [NO]BF4 liefern die Komplexsalze [Rh2H5(PiPr3)4]BF4 (9b) und trans-[RhF(NO)(PiPr3)2]BF4 (11). Das in den Verbindungen 9a und 9b vorliegende Kation [Rh2(μ-H)3H2(PiPr3)4]+ unterliegt in Lösung einer intramolekularen Umlagerung, in der die verbrückenden Hydridoliganden und die Phosphangruppen einbezogen sind.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200705
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  • 3
    Electronic Resource
    Electronic Resource
    Ionische Kronenetherkomplexe von Zinn(II) und Zinn(IV): [Sn(15-Krone-5)] [SnCl6] und [SnCl3(18-Krone-6)]2[Sn2Cl10]; Synthesen, IR-Spektren und 119Sn-Mößbauer-Spektren (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 615 (1992), S. 127-130 
    Details
    ISSN: 0044-2313
    Keywords: Ionic Crown Ether Complexes of Tin(II) and Tin(IV) ; synthesis ; IR spectra ; 119Sn-Mössbauer spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ionic Crown Ether Complexes of Tin(II) and Tin(IV): [Sn(15-Crown-5)][SnCl6] and [SnCl3(18-Crown-6)]2[Sn2Cl10]; Syntheses, IR Spectra, and 119Sn-Mössbauer Spectra[Sn(15-crown-5)][SnCl6] (1,) has been prepared by the reaction of SnCl2, SnCl4, and 15-crown-5 in the molar ratio of 1 : 1 : 1 in acetonitrile solution, forming a white insoluble crystal powder. [SnCl3(18-crown-6)]2[Sn2Cl10] (2,) as well as [SnCl3(18-crown-6)][BiCl4] · CH3CN (3,) are prepared by the reaction of SnCl4 with 18-crown-6 (molar ratio 2 : 1), and of SnCl4, 18-crown-6, and BiCl3 (molar ratio 1 : 1 : 1), respectively. According to IR-spectroscopy and 119Sn-Mössbauer-spectroscopy 1-3, have ionic structures; the cation of 1, being polymeric via a sandwich-like structure.
    Notes: [Sn(15-Krone-5)] [SnCl6] (1,) entsteht als schwerlösliches weißes Kristallpulver aus SnCl2, SnCl4 und 15-Krone-5 im Molverhältnis 1 : 1 : 1 in Acetonitrillösung, während [SnCl3(18-Krone-6)]2[Sn2Cl10] (2,) aus SnCl4 und 18-Krone-6 im Molverhältnis 2 : 1 und [SnCl3(18-Krone-6)] [BiCl4] · CH3CN (3,) aus SnCl4, 18-Krone-6 und BiCl3 im Molverhältnis 1 : 1 : 1 gebildet werden. Aus den IR- und den 119Sn-Mößbauer-Spektren wird auf ionische Strukturen geschlossen; das Kation von 1, besitzt eine polymere Struktur, in der das Sn2+ -Ion über (15-Krone-5)-Moleküle sandwichartig gestapelt ist.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926150926
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