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1Author    HerbertW. Roesky, Pierre Schäfer, Mathias Noltemeyer, GeorgeM. SheldrickRequires cookie*
 Title    Zur Darstellung und Struktur des 1.3-Dichloro-5-N.N-dimethylamino-1.3-dithia-2.4.6-triazins Synthesis and Structure of l,3-Dichloro-5-N,N-dimethylamino-l,3-dithia-2,4,6-triazine  
 Abstract    The six membered ring of composition (CH3)2NCN3S2Cl2 8 a was prepared from N,N-dimethylguanidinhydrochloride and trithiadiazindichloride. 3 a was characterized on the basis of mass, 1 H, 13 C NMR spectra and X-ray structure analysis. Crystals of 3 a are monoclinic, space group P2i/c, with a — 660.3(6), b = 834.5(7), c = 1774.7(15) pm, ß = 112.83(6)° and Z = 4. The C2N unit lies approximately in the plane of the [-CNSNSN-] ring, with both Cl atoms on the same side of the ring. 
  Reference    Z. Naturforsch. 38b, 347—349 (1983); eingegangen am 16. September 1982 
  Published    1983 
  Keywords    Six Membered Ring, Carbon, Sulfur, Nitrogen, X-Ray Structure 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0347.pdf 
 Identifier    ZNB-1983-38b-0347 
 Volume    38 
2Author    Hans-Ulrich Meisch, Wolfgang Reinle, Bernd-Arwed RichterRequires cookie*
 Title    Zur Frage biogener Anreicherungen von Vanadium und Nickel in Pflanzen des Karbonzeitalters The Question of Biogenous Enrichments of Vanadium and Nickel in Plants of the Carbon Age  
 Abstract    O riginal carbonaceous m aterial of fossile carbon plants from the divisions of the Equisetophyta (Calam ariaceae), Lycophyta (Lepidodendraceae, S igillariacea e), Filicophyta (F ilicatae), and Sper-matophyta (Pteridospermatae, Cordaitidae) was analyzed by atomic absorption spectroscopy on its content of the trace metals vanadium and nickel. The average V-content was found to be 1 0 to 100 fold higher than that of the neighbouring coal beds or that of the embedding materials, while the Ni-concentrations were found to be almost in the same range. The highest contents of V and N i were found in the Calamariaceae and in the Pteridospermatae. The V-and Ni-contents of the fossile carbon plants are compared to those of related recent plant genera (clubmosses, horse­ tails, fern s), which were analyzed by 46 representative samples. A possible biogenous enrichment of V and N i in plants of the carbon age is discussed. 
  Reference    Z. Naturforsch. 33c, 616 (1978); eingegangen am 7. Juni/21. Juni 1978 
  Published    1978 
  Keywords    Vanadium, Nickel, Carbon, Carbon Plants, Ferns, Horsetails, Clubmosses 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0616.pdf 
 Identifier    ZNC-1978-33c-0616 
 Volume    33 
3Author    RobinK H Arris, LawrenceH. Merwin, G.Erhard HägeleRequires cookie*
 Title    Salts of Phosphonic Acid Derivatives: Illustrative Examples of Solid State NMR Spectroscopy  
 Abstract    H igh-resolution solid state 1 3 C, 23Na and 31P N M R data have been obtained for the acid form and for several salts o f the phosphonic acids: eth an e-1 ,2 -diphosphonic acid, ethane-l-hydroxy-1.1-diphosphonic acid (H E D P), and 3-am ino-l-hydroxypropan e-l,l-d ip hosp hon ic acid. The data provide evidence by which sample purity and crystallinity may be exam ined and from which the size o f the asymmetric unit may be determ ined. In the case o f the sodium salts o f ethane-1.2-diphosphonic acid, the 3IP and _3Na spectra provide evidence o f possible motion or bond fluctionality for the phosphonic acid group. 
  Reference    Z. Naturforsch. 44b, 1407 (1989); received July 4 1989 
  Published    1989 
  Keywords    NM R Spectra, Solid State Phase Phosphonic A cid, Phosphorus, Carbon 
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 TEI-XML for    default:Reihe_B/44/ZNB-1989-44b-1407.pdf 
 Identifier    ZNB-1989-44b-1407 
 Volume    44