| 摘 要： | A new mixed-ligand Mn(II)complex,namely [Mn(bipy)2(Huca)]·5H2O(1,bipy = 2,2'-bipyridine,and H3uca = uracil-5-carboxylic acid)has been prepared and characterized by single-crystal X-ray diffraction,FT-IR spectroscopy and thermogravimetric analysis.It crystallizes in monoclinic,space group C2/c with a = 23.597(8),b = 16.434(5),c = 15.531(6),β = 112.785(6)o,C25H28MnN6O9,Mr = 611.47,V = 5553(3)3,Z = 8,μ = 0.538,Dc = 1.463 g/cm3,F(000)= 2536,R = 0.0441 and wR = 0.1230 for all 5227 observed reflections(I > 2σ(I)).The manganese(II)center is surrounded by three bidentate chelating ligands,and it displays a severely distorted octahedral geometry,with cis angles ranging from 72.14(6)to 109.78(6)o.Extensive intermolecular hydrogen bonds link the [Mn(bipy)2(Huca)] monomers and lattice water molecules to yield a three-dimensional supramolecular framework.TGA shows complete removal of all lattice water molecules above 270 ℃.
|
