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  • 1
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 42 (1986), S. 1602-1604 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 537 (1986), S. 79-87 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Electrochemical Investigation of 1,1-Dicyanoethylene-2,2-dithiolate and Structure of the Anion 1,1-Dicyanoethylene-2,2-thiolatodisulfide, (—S(S)CC(CN)2)22-The anion 1,1-dicyanoethylene-2,2-dithiolate (S2C4N2)2- exhibits two anodic maxima in the cv-diagram. The reaction product of the first oxidation step is the dimer [(NC)2C=C(S)S—S(S)C=C(CN)2]2-. An x-ray crystal structure determination shows that the anion consists of two planar (S2C4N2) units which are oriented perpendicular within the anion.
    Notes: Das Anion 1,1-Dicyanoethylen-2,2-dithiolat (S2C4N2)2- zeigt im CV-Diagramm zwei anodische Maxima. Als Folgeprodukt der Primäroxydation entsteht das Dimere [(NC)2C=C(S)S—S(S)C=C(CN)2]2-, dessen Struktur röntgenographisch aufgeklärt wurde. Im Dimeren sind die (S2C4N2)-Einheiten planar und relativ zueinander senkrecht angeordnet.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Protonation and Methylation of 1, 1-Dicyanoethylene-2, 2-dithiolate Dianion. Preparative and Structural InvestigationsProtonation of alkaline metal salts of [S2C = C(CN)2]2- (I) in water yields a product of composition H2S2C4N2 (II). The species has to be formulated as dimere and crystallizes with two moles DMSO from DMSO solution with space group C2/c and a = 20.611(3), b = 4.800(1), c = 20.638(3) Å, β = 103.3(1)°, Z = 4. The X-ray structural analysis shows II to be a centrosymmetric 1, 3-Dithiacyclobutane system.On methylation of I with CH3I in the molar ratio 1:1, the monomethylated anion III can be isolated as AsPh4 salt. The compound crystallizes in the monoclinic space group P21/c, with a = 23.632(2), b = 14.304(1), c = 7.989(1) Å, β = 100.1(8)° and Z = 4. There are nearly planar anions [MeS(S)C=C(CN)2]- with an anti-conformation of the MeS group.
    Notes: Alkalimetallsalze des Dianions [S2C=C(CN)2]2- (I) liefern bei Protonierung in wässriger Lösung ein Produkt der Zusammensetzung H2S2C4N2 (II). II erweist sich als dimeres H4S4C8N4 und kristallisiert mit 2 mol DMSO in der Raumgruppe C2/c mit a = 20,611(3), b = 4,800(1), c = 20,638(3) Å, β = 103,3(1)° und Z = 4. Die Strukturanalyse steht in Einklang mit NMR- und IR-Daten und liefert für II ein zentrosymmetrisches Desaurin.Die Methylierung von I mit CH3I im Verhältnis 1:1 liefert das Mono-S-methylprodukt (III), das in From des Tetraphenylarsoniumsalzes strukturell charakterisiert wurde. Die Verbindung kristallisiert in der Raumgruppe P21/c mit a = 23,632(2), b = 14,304(1), c = 7,989(1) Å, β = 100,1(8)° und Z = 4. Die Anionen III sind nahezu planar und zeichnen sich durch eine anti-Konformation der CH3S-Gruppierung aus.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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