Synthesis, Crystal Structure and Catalytic Activity of a 1D Chained Ca(II) Coordination Polymer with 3,5-Bis(4-pyridylmethoxy)benzoate Ligand.

A new 1D chained Ca(II) coordination polymer--namely, [CaL₂(H₂O)₂]_n (HL = 3,5-bis(4-pyridylmethoxy)benzoic acid)--was synthesized though the reaction of Ca(ClO₄)₂.4H₂O, 3,5-bis(4-pyridylmethoxy)benzoic acid and NaOH in H₂O/CH₃CH₂OH (v:v = 1:2) solution. Its structure was determined by elemental analysis, infrared spectrum, and single-crystal XRD. Structural analyses show that each Ca(II) ion is eight-coordinated by six oxygen atoms of four 3,5-bis(4-pyridylmethoxy)benzoate ligands and two oxygen atoms of two coordinated H₂O molecules to form a square-antiprismatic CaO₈ polyhedron. The Ca(II) complex displays a 1D chained structure constructed by the bridging effect of the bidentate carboxyl group of 3,5-bis(4-pyridylmethoxy)benzoate ligand. The catalytic activity of the Ca-complex was tested for the preparation of propargylamine in the A³ coupling reaction. [ABSTRACT FROM AUTHOR]