Extending framework based on the linear coordination polymers: Alternative chains containing lanthanum ion and acrylic acid ligand

One-dimensional alternative chains of two lanthanum complexes: [La(L1)3(CH3OH)(H2O)2]·5H2O (L1=anion of α-cyano-4-hydroxycinnamic acid ) 1 and [La(L2)3(H2O)2]·3H2O (L2=anion of trans-3-(4-methyl-benzoyl)-acrylic acid) 2 were synthesized and structurally characterized by single-crystal X-ray diffraction, element analysis, IR and thermogravimetric analysis. The crystal structure data are as follows for 1: C31H36LaN3O17, triclinic, P-1, image, image, image, image, image, image, image, image, image; for 2: C33H37LaO14, triclinic, P-1, image, image, image, image, image, image, image, image, image. 1 is a rare example of the alternative chain constructed by syn–syn and anti–syn coordination mode of carboxylato ligand arranged along the chain alternatively. La(III) ions in 2 are linked by two η3–O bridges and four bridges (two η2–O and two η3–O) alternatively. Both of the linear coordination polymers grow into two- and three-dimensional networks by packing through extending hydrogen-bond network directed by ligands.