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  • 1995-1999  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    X-ray crystallographic and physical investigation of tricyanomethanide and dicyanamide complexes of cobalt(II) with imidazole and its methyl derivatives (1995)
    Springer
    Transition metal chemistry 20 (1995), S. 276-279 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Reaction of CoII with N(CN) inf2 sup− or C(CN) inf3 sup− in the presence of imidazole (iz) or its methyl derivatives (2-meiz and 4-meiz) gave eight compounds of CoII: ligand stoichiometry 1∶2, including two isomeric pairs (α and β) for the complexes [Co{C(CN)3}2(2-meiz)2] and [Co{C(CN)3}2-(4-meiz)2]. The complexes were studied by electronic and i.r. spectroscopies. For α-[Co{C(CN)3}2(2-meiz)2] singlecrystal X-ray analysis was performed; its crystal structure consists of one-dimensional chains, formed by C(CN) inf3 sup− anions bridging between the CoII atoms. The CoII atom is nearly octahedrally coordinated by two tertiary nitrogens of 2-meiz and four nitrogens of C(CN) inf3 sup− . The spectra of these compounds and of the complexes with iz, as well as that of α-[Co{C(CN)3}2(4-meiz)2], indicate all these compounds to have basically the same bridging polymeric octahedral structure. However, the spectra indicate distorted tetrahedral structures for the remaining compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00143492
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nucleophilic addition of methanol to nitrosodicyanomethanide in the coordination sphere of MII ions (M = Ni, Cu, Co and Pd); nitrosodicyanomethanide as an O-coordinating ligand for nickel(II) (1998)
    Springer
    Transition metal chemistry 23 (1998), S. 215-220 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The systems MII-ONC(CN)2 −-L-MeOH-H2O [M = Ni, Cu, Co or Pd; L = pyrazole (pz)] were studied to determine conditions for the nucleophilic addition of MeOH to nitrosodicyanomethanide (ndcm)− in the metal coordination sphere. Compounds containing two or three bidentate anionic chelate ligands derived from methyl-2-cyano-2-(hydroxyimino)ethanimidic acid, H(mcoe), formed by nucleophilic addition of MeOH to ONC(CN)2 −, were isolated: [Cu(mcoe)2(H2O)2] (elongated pseudo-octahedron with two water molecules at long axial distances), [Co(mcoe)3] (approximate octahedron) and [Pd(mcoe)2] (square-planar). In the CoII system, oxidation to CoIII took place. In addition, simple nitrosodicyanomethanide compounds [Ni(ndcm)2(pz)4] (nearly octahedral) and [Pd(ndcm)2(pz)2] (square-planar) were obtained. The crystal structure of trans-[Ni(ndcm)2(pz)4] has been elucidated by X-ray crystallography. The NiII atom is nearly octahedrally coordinated by four nitrogens of pz and two oxygens of (ndcm)−. This compound is the first example of a transition metal oxygen-coordinated nitrosodicyanomethanide complex with a short metal-oxygen bond. The remaining compounds were characterized by i.r. and electronic spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1015763506523
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    Paper (German National Licenses)
    Fulltext
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