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A New Class of Biomimetically Relevant “Scorpionate” Ligands. 1. The (2-Hydroxyphenyl)bis(pyrazolyl)methanes:  Synthesis and Structural Characterization of Some Cobalt(II) Complexes

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journal contribution
posted on 29.01.1997, 00:00 by Timothy C. Higgs, Carl J. Carrano
The syntheses of a new class of potentially biomimetic, tripodal, mixed functionality ligands, (2-hydroxyphenyl)bis(pyrazolyl)methane (L1), (2-hydroxyphenyl)bis(3,5-dimethylpyrazolyl)methane (L2), and (2-hydroxyphenyl)bis(3-isopropylpyrazolyl)methane (L3), are described. These ligands have been used to prepare the cobalt(II) complexes [Co(L1)2]·2.5MeOH·1.5H2O, 1·2.5MeOH·1.5H2O; [Co(L2)2]·0.5H2O, 2·0.5H2O; [Co(L3)Cl2], 3; and [Co33-OH)2(μ-L3)2(L3)(H2O)]BF4, 4. X-ray structural analysis of 14 gave the following structural parameters:  1, C30H34N8CoO6, triclinic, a = 8.286(2) Å, b = 10.053(3) Å, c = 10.562(2) Å, α = 109.66(2)°, β = 96.57(1)°, γ = 91.11(3)°, space group P1̄, Z = 1; 2, C38H38N8CoO6, triclinic, a = 8.746(5) Å, b = 10.900(5) Å, c = 11.399(8) Å, α = 70.82(4)°, β = 75.13(5)°, γ = 81.46(4)°, space group P1̄, Z = 1; 3, C20H26N4Cl4CoO, monoclinic, a = 10.934(2) Å, b = 12.404(2) Å, c = 19.267(3) Å, β = 98.33(1)°, space group P21/n, Z = 4; 4, C58H70N12BCo3F4O9, monoclinic, a = 14.798(5) Å, b = 23.657(8) Å, c = 20.614(7) Å, β = 97.75(2)°, space group P21/n, Z = 4.

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