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  • 1
    Electronic Resource
    Electronic Resource
    10-Ethyl-3-(4-methoxyphenyl)-1,2,4-triazolo[4′,3′:2,3]-1,2,4-triazino[5,6-b]indole (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. e472-e473 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Oxidative cyclization of 5-ethyl-3-(4-methoxybenzylidene)hydrazino-1,2,4-triazino[5,6-b]indole gave the linearly annelated title compound, C19H16N6O. The skeleton is approximately planar, except for the ethyl group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010827010001194X
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  • 2
    Electronic Resource
    Electronic Resource
    Conformational isomers of neutral trans-dinitrocobalt(III) complexes (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 33-35 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The reaction of Co(acac)3 with N-(2-aminoethyl)-1,3-propanediamine in the presence of NaNO2 results in the preparation of an unexpected dinitrocobalt(III) compound, (11-amino-4-methyl-5,8-diazaundeca-2,4-dien-2-olato-κ4N5,8,11,O)-dinitrocobalt(III), [Co(C10H20N3O)(NO2)2], containing the tetradentate anion of 11-amino-4-methyl-5,8-diazaundeca-2,4-dien-2-ol. Two isomers of the compound were obtained by recrystallization of the crude product. In one isomer, the two trans nitro groups are staggered, and in the other they are eclipsed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100014463
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  • 3
    Electronic Resource
    Electronic Resource
    Triazidocobalt(III) complexes with tridentate amine ligands (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 1326-1329 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compounds, [N-(2-aminoethyl)-1,3-propanediamine-κ3N]triazidocobalt(III), [Co(N3)3(C5H15N3)], [N-(2-aminoethyl)-N-methyl-1,3-propanediamine-κ3N]triazidocobalt(III), [Co(N3)3(C6H17N3)], [N-(2-aminopropyl)-1,3-propanediamine-κ3N]triazidocobalt(III), [Co(N3)3(C6H17N3)], and [N-(2-aminopropyl)-N-methyl-1,3-propanediamine-κ3N]triazidocobalt(III), [Co(N3)3(C7H19N3)], each consist of a CoIII atom, three azide ligands in a meridional configuration and a tridentate amine ligand, namely aepn [N-(2-aminoethyl)-1,3-propanediamine] or dpt [N-(3-aminopropyl)-1,3-propanediamine], or their N-methylated analogs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100011793
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  • 4
    Electronic Resource
    Electronic Resource
    The Interaction between Amminehalocobalt(III) Cations and Polythionate Anions: Hydrogen-Bonding Patterns and S-S Bond Cleavage Reactions (2000)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 2000 (2000), S. 189-193 
    Details
    ISSN: 1434-1948
    Keywords: Cobalt(III) ; Dithionate ; Trithionate ; Sulfato ligand ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Crystal structures of amminehalocobalt(III) compounds with di- or trithionate anions have been determined in order to know whether they interact to adopt specific molecular packing patterns and whether di- and trithionate anions undergo the S-S bond cleavage reactions as has been found for the S4O62- ion. In the structures of p-[Co(tren)(NH3)Cl]S2O6·H2O (1) and t-[Co(tren)(NH3)Cl]S2O6 (2), the configurational differences in the cations dictate the hydrogen-bonding pattern with the dithionate anion to lead to racemic structures. cis-[Co(en)2(NH3)Br]S3O6 (3) also crystallizes in a racemic space group P21/c in which the ions form a macrocyclic hydrogen-bonded network. Aqueous solutions of S3O62- and p-[Co(tren)(NH3)Cl]2+ produce p-[Co(tren)(NH3)(OSO3)]ClO4 (4) which is believed to be derived from the hydrolytic cleavage of S-S bond in the trithionate anion. These results reinforce our previous observation of the S-S cleavage reactions for the tetrathionate anion.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 5
    Electronic Resource
    Electronic Resource
    Crystal Structures of Oxalato and Oxamido Polyaminecobalt(III) Complexes Produced by Hydrolysis of Monooxamide (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 723-728 
    Details
    ISSN: 1434-1948
    Keywords: Monooxamide ; Amide hydrolysis ; Cobalt(III) ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reactions of sodium monooxamide (H2NCOCO2Na) with trans-[Co(en)2Cl2]Cl, trans-[Co(3,2,3-tet)Cl2]Cl (3,2,3-tet = 1,5,8,12-tetraazadodecane), cis-α-[Co(trien)Cl2]Cl and [Co(tren)Cl2]Cl result in the formation of [Co(en)2(ox)]Cl · 4H2O (1), cis-β-[Co(3,2,3-tet)(ox)]Cl· 4 H2O (2), cis-α-[Co(trien)(ox)]Cl · 2 H2O (3), and [Co(tren)(ox)](ClO4) · 0.5 H2O (4) respectively, implying a hydrolytic cleavage of the amide bond. [Co(tren)(O,O′-oxam)]Cl2 · 2 H2O (5) (oxam = H2NCOCO2-) and p-[Co(tren)(NH3)(O-oxam)]Cl2 (6) have also been prepared in order to give mechanistic information for the hydrolysis of monooxamide. Crystal structures of the products are reported and possible pathways for the hydrolysis reactions are discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 6
    Electronic Resource
    Electronic Resource
    Syntheses of K[Co(tren)(NH3)(SO4)](S4O6)·2(H2O) and of [cis-α-Co(trien)(NH3)Cl](S5O6) - Compounds Produced by Hydrolytic Cleavage of Sulfur-Sulfur Bonds of the Tetrathionate Anion (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 717-722 
    Details
    ISSN: 1434-1948
    Keywords: Tetrathionates ; Pentathionates ; Sulfato ligands ; Cobalt(III) complexes ; Thiobacillus ferrooxidans ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: K[Co(tren)(NH3)(SO4)](S4O6)·2(H2O) (1) and [cis-α-Co-(trien)(NH3)Cl](S5O6) (2) have been prepared unexpectedly while attempting to obtain crystals suitable for X-ray diffraction of [Co(tren)(NH3)Cl](S4O6) (3) and of [cis-Co(trien)(NH3)Cl](S4O6) (4), respectively. 1 is derived from 3 by hydrolysis of the tetrathionate anion resulting in a sulfato moiety which displaces the chloro ligand from the coordination sphere of the metal center. 2 is derived from 4 by hydrolysis of the tetrathionate anion followed by reformation into pentathionate anion and H2S, as described in previous chromatographic work by Steudel. Compounds 1 and 2 have been characterized by elemental analyses and by single-crystal X-ray diffraction studies.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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