Synthesis and Characterization of Zinc(II) Tetraaza Macrocyclic Complexes with Aquo and Nitrate Ligands
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The complexes [Zn(L)(H2O)2]⋅2NO2 (1) and [Zn(L)(NO3)2] (2) (L = 3,14-dimethyl-2,6,13,17-tetraazatricyclo [14,4,01.18,07.12]docosane) have been synthesized and structurally characterized. The compound 1 crystallizes in the monoclinic system P21/c with a = 8.74650(10), b = 18.6880(3), c = 7.96680(10) Å, β = 109.1920(10)°, V = 1229.84(3) Å3, Z = 2. The compound 2 crystallizes in the monoclinic system P1 with a = 8.1292(5), b = 8.9244(5), c = 9.1398(5) Å, α = 68.035(2), β = 70.109(2), γ = 75.649(3)°, V = 572.70(6) Å3, Z = 1. The crystal structures of the compounds 1 and 2 show a distorted octahedral coordination geometry around the zinc(II) ion, with four secondary amines and two oxygen atoms of the two water and two nitrate ligands at the axial position. The TGA behaviors of the complexes are significantly affected by the nature of the tetraaza macrocycle and the axial ligands.
Abstract
The complexes [Zn(L)(H2O)2]⋅2NO2 (1) and [Zn(L)(NO3)2] (2) (L = 3,14-dimethyl-2,6,13,17-tetraazatricyclo [14,4,01.18,07.12]docosane) have been synthesized and structurally characterized. The compound 1 crystallizes in the monoclinic system P21/c with a = 8.74650(10), b = 18.6880(3), c = 7.96680(10) Å, β = 109.1920(10)°, V = 1229.84(3) Å3, Z = 2. The compound 2 crystallizes in the monoclinic system P1 with a = 8.1292(5), b = 8.9244(5), c = 9.1398(5) Å, α = 68.035(2), β = 70.109(2), γ = 75.649(3)°, V = 572.70(6) Å3, Z = 1. The crystal structures of the compounds 1 and 2 show a distorted octahedral coordination geometry around the zinc(II) ion, with four secondary amines and two oxygen atoms of the two water and two nitrate ligands at the axial position. The TGA behaviors of the complexes are significantly affected by the nature of the tetraaza macrocycle and the axial ligands.
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