Abstract: A new porous cobalt compound ［Co(L)_1.5(BDC)(H₂O)₃]_n(1) (L=N,N′-bis(3-pyridyl)adipamide, H₂BDC=1,2benzenedicarboxylic acid) was prepared by the selfassembly process of hydrothermal synthesis by selecting the mixed ligands of the flexible bis(pyridyl)bis(amide) L and the aromatic dicarboxylate H₂BDC. The crystal structure of the compound was characterized by the element analysis, IR and the single crystal Xray diffraction technique. Experimental results show that the compound belongs to   triclinic system, P1 space group, a=1.097 87(10) nm, b=1.213 82(11) nm,c=1.429 40(13) nm, α=72.788(2)°, β=75.235(2)°, γ=72.127(2)°, V=1.703 3(3) nm³, M_r=575.43, Z=2, Dcal=1122 g/cm³, μ=
0.549 mm^-1, F(000)=598, S=1.064, R₁=0.054 3, ωR₂=0.151 8. The metal cobalt ions are bridged by the bidentate L ligands to form a onedimensional ［Co(L)_1.5］²ⁿ⁺_n chain structrue, and the carboxylate ligand BDC is suspended on both sides of this chain with a monodentated coordination mode.
A threedimensional supramolecular porous network with large pore structure is expanded by the hydrogenbonding interactions among onedimensional chains. This porous cobalt compound shows the remarkable photocatalytic degradation ability to the organic dye molecules methylene blue or congo red under the UV light.

Key words: photocatalytic activity, porous structure, hydrogenbonding interaction, cobalt compound, mixed ligand