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  • 2000-2004  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Crystal structure of [Cu2(II)(dmpa)2(p-Cl-C6H5COO)2] (Hdmpa = N,N-dimethyl-3-amino-1-propanol) (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 35-38 
    Details
    ISSN: 1572-8854
    Keywords: copper(II) ; aminoalcoholato ; hydrogen bonding ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The copper complex, [Cu2(II)(dmpa)2(p-Cl-C6H5COO)2], has been prepared and its structure determined using X-ray crystallography. The dimer is a di-μ2-alkoxo complex which is a five-coordinate copper dimer with unsupported alkoxo bridges. The complex crystallizes in the triclinic space group P-1 with a = 11.384(2), b = 14.636(5), c = 9.609(2) Å, α = 100.07(2), β = 104.33(3), γ = 72.79(2)°, V = 1471.8(7) Å3, and Z = 2. The structure is comprised of discrete binuclear clusters in which the metal atoms are bridged by two alkoxo oxygens of the dmpa− ligands. The Cu-O and Cu-N distances are in good agreement with those found for other copper(II) aminoalcoholato complexes. The Cu···Cu distance is 2.9765(6) Å. In the crystal, every two dimeric coordination molecules are combined together by the recognition through intermolecular hydrogen-bonding interactions between the apical water molecule and the non-coordinated O atom from the p-chlorobenzoato ligand, forminga tetramer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009542031602
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis, crystal structure and properties of a novel di-μ2-aqua bridged binuclear manganese(III) Schiff base complex [Mn(vanen)(H2O)2]2(ClO4)2 · 2H2O (2000)
    Springer
    Transition metal chemistry 25 (2000), S. 270-273 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The preparation and isolation of the binuclear manganese(III) complex, [Mn(vanen)(H2O)2]2(ClO4)2 · 2H2O was accomplished by air oxidation of a solution containing H2vanen**, Et3N, and Mn(ClO4)2 · 6H2O in absolute EtOH. The crystal structure of complex was determined by X-ray crystallography, and consists of two molecules bridged by two water molecules through hydrogen bonding. The manganese atom is six-coordinate and presents a distorted octahedral coordination sphere, which consists of the two imine N atoms and two phenolic O atoms of vanen2− ligand in the equatorial plane, with Mn–N bond distances of 1.975 and 1.987 Å, and Mn–O distances of 1.867 and 1.876 Å, respectively. The non-bonding interatomic Mn⋯Mn distance is 4.79 Å. In the axial direction, the elongated Mn–O(H2O) bond distances of 2.255 and 2.381 Å, respectively, are due to Jahn–Teller distortion at the d4 metal center. The presence of lattice and coordinate water molecules were also confirmed by the t.g. study and the i.r. spectra. Upon irradiation using visible light in water in the presence of p-benzoquinone, the complex demonstrates its ability to split water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007088305341
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis, crystal structure and properties of di-μ2-alkoxo bridged binuclear manganese(III) Schiff base complexes (2000)
    Springer
    Transition metal chemistry 25 (2000), S. 377-381 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Preparation and isolation of the dimeric manganese(III) complex, [Mn2(Salpa)2(H2O)2Cl2] · 2DMF, (1), was accomplished by air oxidation of a solution containing MnCl2 · 4H2O, Et3N and H2Salpa** in DMF. Complex (2), [Mn2(Salpa)2(H2O)2(N3)2] · 2EtOH was obtained by reacting (1) or [Mn2(Salpa)2(AcO)2], (3), with NaN3 in EtOH. The crystal structure of (1) was determined by X-ray crystallography. It consists of discrete six-coordinate dimeric manganese molecules with unsupported alkoxido bridges, a rare example of a chloride- and water-containing manganese model complex for the oxygen-evolution center of photosystem II. The Mn–O and Mn–N distances are in good agreement with those found for other manganese(III) Schiff base complexes. The Mn–Cl and Mn–O(water) distances of 2.5577(11) and 2.323(3) Å, respectively are due to Jahn-Teller distortion at the d4 metal center. The Mn ⋯ Mn distance is 3.0077(12) Å. In the crystal, the distance between the H2O molecule and the O atom of DMF of 2.692(5) Å suggests hydrogen binding interactions. A t.g. study of (1) confirmed that the complex contains DMF molecules. Magnetic measurements on (1) and (2) reveal the presence of antiferromagnetic spin-exchange interactions between the manganese(III) ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007097429960
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