Mononuclear Eight-Coordinate (NH4)3[Y~(III)(Nta)2] and One-Dimensional Unlimited Zigzag Type Nine-Coordinate {K[Y~(III)(Egta) - 4H2O}_n Complexes:Syntheses and Structural Determination

摘要

The title complexes (NH4)3[Y~(III)(Nta)2] (I) (H3Nta = nitrilotriacetic acid) and {K[Y~(III)(Egta)]·4H2O}_n (II) (H4Egta = ethyleneglycol-bis-(2-aminoethylether)-N,N,N',N'-tetraacetic acid) were prepared, and their molecular and crystal structures were determined by single-crystal X-ray diffraction techniques. Complex I crystallizes in the rhombohedral crystal system with R3c space group. The central Y~(3+) ion is eight-coordinated by two nitrogen and six oxygen atoms, which come from two tetradentate Nta ligands. The crystal data are as follows: a = 7.9340(14) A, c = 54.611(15) A, V= 2977.1(11) A~3, Z= 6, p_(calce) = 1.738 mg/cm~3, μ = 3.011 mm~(-1), F(000) = 1596, R = 0.0234 and wR = 0.0641 for 686 observed reflections with I≥ 2σ(I). The {K[Y~(III)(Egta)]·4H2O}_n is nine-coordinated by two nitrogen and seven oxygen atoms and produces a 1D unlimited zigzag-type chain through a bridging carboxylic group. {K[Y~(III)Egta)]·4H2O}_n crystallizes in the monoclinic crystal system with C2/c space group. The crystal data are as follows: a = 37.588(5) A, b = 13.7101(19) A, c = 8.6070(12) A,β = 99.929(2)°, V= 4369.0(11) A~3, Z= 8, p_(calcd) = 1.753 mg/cm~3, μ = 2.934 mm~(-1), F(000) = 2368, R = 0.0385 and wR = 0.0800 for 4082 observed reflections with I≥ 2σ(I).