Two uranyl-containing organic coordination polymers, (UO 2 ) 2 (μ 2 -OH)(pdc) 2 Zn(bpy)(Ac) 2 (H 2 O) 9 (1) (H 2 pdc=pyridine-2,6-dicarboxylic acid, bpy=4,4′-bipyridine, HAc=acetic acid) and UO 2 (pdc)(H 2 O) (2) have been prepared through a hydrothermal route and characterized by single-crystal X-ray diffraction, thermogravimetric analyses (TGA) and adsorption measurement 1 possesses infinite water cluster chains, which play an important role in the stabilization of the crystal structure. Whereas compound 2 is thermally stable up to at least 350°C, this material exhibits considerable adsorption capacity for water and methanol upon removal of the guest species in the microporous channels.