Abstract
A cobalt(II) compound, [Co4(L)2(OH)2(phen)2(H2O)4] · 6H2O (1), and a copper(II) compound, [Cu2(L)2(H2O)2][Cu(H2O)6] · 6H2O (2) [where H3L is 2-hydroxy-3-[(2-sulfoethylimino)-methyl]-benzoic acid and phen is O-phenanthroline], were prepared and characterized. The tetranuclear cobalt complex 1, C44H62N6O28S2Co4, crystallizes in the monoclinic space group P21/c, with a = 11.847(10) Å, b = 19.061(15) Å, c = 12.635(10) Å, β = 105.483(9)°, and Z = 2; R 1 for 4821 observed reflections [I > 2σ(I)] was 0.0679. Complex 1 is a centrosymmetric tetranuclear cobalt complex with all cobalts having distorted octahedral geometry. The molecule can be viewed as two planar [Co2(OH)(L)(Phen)H2O] units tied together by two terminal water molecules. The framework of 1 has the appearance of two connected face-sharing cubes, each with one vertex missing. The trinuclear copper complex 2, C20H44Cu3N2O26S2, crystallizes in the triclinic space group P1, with a = 7.524(1) Å, b = 7.902(2) Å, c = 16.885(4) Å, α = 88.993(6)°, β = 80.725(7)°, γ = 66.725(4)° and Z = 1; R 1 for 4298 observed reflections [I > 2σ (I)] was 0.0360. Complex 2 is an ionic compound, in which the three Cu(II) centers have two coordination modes. The molecule has a centrosymmetric dinuclear copper coordinated anion and a hexa-aqua-copper cation. The sulfonic acid group has less coordination ability than carboxylate oxygen.
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