Two Coordination Polymers Containing Linear Co(II)- Trinuclear and Cu(II)-Chain Assembled from 4-Fluorocinnamic Acid and N-Donor Ligand

Two new coordination polymers, named {[Co3(pfca)6(phen)2]·2H2O}n (1) and [Cu(pfca)2(4,4 -bpy)(H2O)]n (2) (Hpfca = 4-fluorocinnamic acid and 4,4 -bpy = 4,4 -bipyridine), were hydrothermally synthesized and characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis (TGA), and single-crystal X-ray diffraction. Complex 1 crystallizes in the triclinic crystal system, space group P1 with a = 10.939(3), b = 12.430(4), c = 13.815(4) A, α = 78.436(3), β = 70.261(3), γ = 80.268(3)°, V = 1721.8(9) A, Dc = 1.508 g/cm, Mr = 1564.06, Z = 1, F(000) = 799, μ = 0.802 mm, the final R = 0.0432 and wR = 0.1015 for 13250 observed reflections with I > 2σ(I). Complex 2 is of monoclinic system, space group P21/c with a = 15.4985(14), b = 15.8424(14), c = 10.9528(10) A, β = 107.1600(10)°, V = 2569.6(4) A, Dc = 1.468 g/cm, Mr = 568.02, Z = 4, F(000) = 1164, μ = 0.906 mm, the final R = 0.0371 and wR = 0.0842 for 18183 observed reflections with I > 2σ(I). Complex 1 features linear Co(II)-trinuclear units, which are assembled into a final 3D supramolecular structure through π···π stacking interactions and F···H weak interactions. Complex 2 consists of 1D polymeric Cu(II)-chains that are further cohered together by extensive H-bonds.