Two Co(II) coordination polymers, [Co(ca)(bib)] n (I) and {[Co(ca)(bibp) 1.5 ]Á 1.5H 2 O} n (II) (H 2 ca = citraconic acid, bib = 1,4-bis(1-imidazoly)benzene, bibp = 1,4-bis-[4-(imidazol-1-yl)benzyl]piperazine), were prepared by hydrothermal method and measured structurally by single-crystal X-ray diffraction, infrared spectroscopy, and elemental analysis. Complex I shows a 2D layer structure containing Cocarboxylate chains. Complex II displays a 3D metal-organic framework composed of the binuclear [Co 2 (CO 2 ) 2 ] 2+ cluster nodes through ca 2− and bibp as linkers with (4 12 Á6 3 ) topology. Complexes I and II have high thermal stabilities because their frameworks maintain good integrity before 340 C and 265 C, respectively. Both complexes show well photocatalytic activities for methylene blue degradation under UV irradiation in the presence of H 2 O 2 , which may be used as potential materials for photocatalytic dyes degradation. K E Y W O R D Scitraconic acid, coordination polymer, photocatalytic degradation, thermal stability

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C22H14CuNO9, triclinic, P1̅ (no. 2), a = 7.9208(4) Å, b = 10.2954(4) Å, c = 13.1361(7) Å, α = 72.719(4)°, β = 79.598(5)°, γ = 85.190(4)°, V = 1005.53(9) Å3, Z = 2, Rgt(F) = 0.0423, wRref(F2) = 0.1051, T = 264(1) K.

CCDC no.: 1468976The symmetric unit of the title structure is shown in the gure. Tables 1-3 contain details of the methods used and a list of the atoms including atomic coordinates and displacement parameters.