摘要:
Six lanthanide two-dimensional network coordination polymers with the general formula of [Ln(pmida)(NO3)(H2O)](n), where Ln = La (1), Nd (2), Sm (3), Gd (4), Dy (5), Er (6) and pmida(2-) = N-(2-pyridylmethyl)iminodiacetate, have been synthesized by hydrothermal process and characterized by elemental analysis, Infrared spectroscopy, thermogravimetric analysis and single-crystal X-ray diffraction. All crystals are isostructural and crystallize in the monoclinic space group P2(1/a). The lanthanide(III) ion is nine-coordinated in a geometry of distorted tricapped trigonal prism by two N atoms and two O atoms from one pmida(2-) ligand, two bridging carboxylate O atoms from other two pmida(2-) ligands, two O atoms of a bidentate chelating nitrate and a O atom of a coordinated water molecule. The luminescent properties of [Sm(pmida)(NO3)(H2O)](n) (3) and [Dy(pmida)(NO3)(H2O)](n) (5) were investigated. (c) 2007 Elsevier B.V. All rights reserved.