Synthesis, Structure and Catalytic Properties of a Cu(II) Coordination Polymer Constructed from Paddle-Wheel Building Blocks

A novel dinuclear Cu(II) coordination polymer, [Cu(BCPPO)H2O](n) (1) [H2BCPPO = bis -4-carboxyphenyl phenyl phosphine oxide], has been synthesized and structurally characterized by single crystal X-ray diffraction, powder X-ray diffraction, thermogravimetric analysis, elemental analysis and infrared spectroscopy. As revealed by the single crystal X-ray diffraction, in complex 1, two paddle-wheel-type Cu-2 units were connected by two BCPPO ligands to form one-dimensional infinite chain. The A(3) coupling reaction of phenylacetylene, aldehyde and amine (piperidine) in the presence of the dinuclear Cu(II) coordination polymer as an efficient heterogeneous catalyst has also been studied. Complex 1 displayed high activity and afforded the corresponding propargylamines with moderate yields.