A new lanthanum coordination polymer formulated as {[La2（pyda） 2（μ4-SO4） ·5H2O]· 2H2O}n（1,H2pyda = 2,6-pyridine-dicarboxylic acid） has been synthesized from the reaction of H2pyda with lanthanide nitr...A new lanthanum coordination polymer formulated as {[La2（pyda） 2（μ4-SO4） ·5H2O]· 2H2O}n（1,H2pyda = 2,6-pyridine-dicarboxylic acid） has been synthesized from the reaction of H2pyda with lanthanide nitrate in the presence of sulfate as a counter anion. The compound was characterized by elemental analysis,IR spectroscopy and X-ray single-crystal diffraction. It crystallizes in the orthorhombic system,space group Pna21,with a = 18.8558（19） ,b = 6.5831（7） and c = 18.7543（19） . The compound is a 2D hybrid,in which the La（Ⅲ） ions were doubly connected by the carboxylic group of pyda2-ligand to form the La（Ⅲ） dimer followed by being grafted into 1D zig-zag chains which are further connected into a 2D network containing {[La（SO4） ]＋}n helical chains. The interchain hydrogen bonding and π-π stacking interactions extended the 2D networks into a 3D supramolecular edifice.展开更多
基金supported by the National Natural Science Foundation of China (No.20971104)the Ph. D. Programs Foundation of Ministry of Education of China (No.200806970008)+1 种基金the Foundation of Education Committee of Henan Province (No.2010A150016)the Tackle Key Problem of Science and Technology Project of Henan Province (No.102102210450)
文摘A new lanthanum coordination polymer formulated as {[La2（pyda） 2（μ4-SO4） ·5H2O]· 2H2O}n（1,H2pyda = 2,6-pyridine-dicarboxylic acid） has been synthesized from the reaction of H2pyda with lanthanide nitrate in the presence of sulfate as a counter anion. The compound was characterized by elemental analysis,IR spectroscopy and X-ray single-crystal diffraction. It crystallizes in the orthorhombic system,space group Pna21,with a = 18.8558（19） ,b = 6.5831（7） and c = 18.7543（19） . The compound is a 2D hybrid,in which the La（Ⅲ） ions were doubly connected by the carboxylic group of pyda2-ligand to form the La（Ⅲ） dimer followed by being grafted into 1D zig-zag chains which are further connected into a 2D network containing {[La（SO4） ]＋}n helical chains. The interchain hydrogen bonding and π-π stacking interactions extended the 2D networks into a 3D supramolecular edifice.
