CRYSTAL STRUCTURES OF SEVEN-COORDINATE (NH4)2[MnII(edta)(H2O)]в‹…3H2O, (NH4)2[MnII(cydta)(H2O)]в‹…4H2O and K2[MnII(Hdtpa)]в‹…3.5H2O COMPLEXES
X.F. Wang, J. Gao, J. Wang, ZH.H. Zhang, Y.F. Wang, L.J. Chen, W. Sun, X.D. Zhang
Keywords: manganese(II) chelate, ethylenediamine-N, N, N?, N?-tetraacetic acid (H4edta), trans-1, 2-cyclohexanediamine-N, N, N?, N?-tetraacetic acid (H4cydta), diethylenetriamine-N, N, N?, N?, N?-pentaacetic acid (H5dtpa)
Pages: 753-759
Abstract
The title compounds, (NH4)2[MnII(edta)(H2O)]⋅3H2O (H4edta = ethylenediamine-N,N,N′,N′-tetraacetic acid), (NH4)2[MnII(cydta)(H2O)]⋅4H2O (H4cydta = trans-1,2-cyclohexanediamine-N,N,N′,N′-tetraacetic acid) and K2[MnII(Hdtpa)]⋅3.5H2O (H5dtpa = diethylenetriamine-N,N,N′,N″,N″-pentaacetic acid), were prepared; their compositions and structures were determined by elemental analysis and single-crystal X-ray diffraction technique. In these three complexes, the Mn2+ ions are all seven-coordinated and have a pseudo-monocapped trigonal prismatic configuration. All the three complexes crystallize in triclinic system in P-1 space group. Crystal data: (NH4)2[MnII(edta)(H2O)]⋅3H2O complex, a = 8.774(3) Å, b = 9.007(3) Å, c = 13.483(4) Å, α = 80.095(4)°, β = 80.708(4)°, γ = 68.770(4)°, V = 972.6(5) Å3, Z = 2, Dc
= 1.541 g/cm3, μ = 0.745 mm-1, R = 0.033 and wR = 0.099 for 3406 observed reflections with I ≥ 2σ(I); (NH4)2[MnII(cydta)(H2O)]⋅4H2O complex, a = 8.9720(18) Å, b = 9.4380(19) Å, c = 14.931(3) Å, α = 76.99(3)°, β = 83.27(3)°, γ = 75.62(3)°, V = 1190.8(4) Å3, Z = 2, Dc = 1.426 g/cm3, μ = 0.625 mm-1, R = 0.061 and wR = 0.197 for 3240 observed reflections with I ≥ 2σ(I); K2[MnII(Hdtpa)]⋅3.5H2O complex, a = 8.672(3) Å, b = 9.059(3) Å, c = 15.074(6) Å, α = 95.813(6)°, β = 96.665(6)°, γ = 99.212(6)°, V = 1152.4(7) Å3, Z = 2, Dc = 1.687 g/cm3, μ = 1.006 mm-1, R = 0.037 and wR = 0.090 for 4654 observed reflections with I ≥ 2σ(I).
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