Syntheses,Structures and Properties of Two New Coordination Polymers with Flexible Ligands as Linkers

Two new coordination polymers,[ZnL1];(1,H;L1 = 5-（4-pyridyl）-methoxyl isophthalic acid) and[Ni（L2）;（H;O）;];(2,HL2 = 4-（pyridin-4-ylmethoxy）benzolic acid),have been synthesized and characterized by elemental analysis,PXRD,IR spectra,and single-crystal X-ray diffraction.Compound 1 has a three-dimensional framework constructed by 6-bridged L1;anions connecting the Zn;（O;C）;paddlewheel-like units.Compound 2 contains a mononuclear molecular unit,and the central nickel atom adopts a slightly distorted octahedral geometry by two nitrogen atoms from different L2;ligands and four oxygen atoms from water molecules.These molecular units link each other via four types of O-H…O hydrogen bonds to form an extended three-dimensional（3D） supramolecular network.The thermal and photoluminescent properties of 1 and 2 have also been investigated.