The Synthesis and Crystal Structures of Two Cobalt(III) Complexes Containing the Ligand 1,4,8,11-Tetraazacyclotetradecane

Abstract

The new cobalt(III) complex [Co(cyclam)(NO₃)₂]NO₃·HNO₃ (2) has been synthesized. The crystal structure of this complex and the related complex [Co(cyclam)(NH₃)₂]Cl₂BF₄·2H₂O (1) have been determined. Crystal data for (1): M 451.04, monoclinic, space group P2₁/c (No. 14), a 7.3927(10), b 13.3082(7), c 19.524(2) Å, β 97.625(14)°, V 1903.9(3) ų, F(000) 936, Z 4, D_c 1.574 g cm^–3, μ 1.225 cm^–1, Mo Kα (graphite monochromatized) λ 0.71073 Å, T 293(1) K. Crystal data for (2): M 571.33, triclinic, space group P1–(No. 2),a 7.3988(14), b 8.5682(16), c 9.209(3) Å, α 89.02(2), β 76.64(3), γ 82.340(16)°, V 562.9(2) ų, F(000) 296, Z 1, D_c 1.685 g cm^–3, μ 0.854 cm^–1, Mo Kα (graphite monochromatized) λ 0.71073 Å, T 293(1) K. In both complexes the complex crystallizes in the trans-III form with the cobalt in the usual octahedral environment.