A new porous zirconium metal organic framework (Zr MOF), Zr-6(mu(3)-O)(4)(mu 3OH)(4)(OH)(6)(H2O)(6)(BTB)(2)center dot 6DMF center dot H2O (1; H3BTB = 5'-(4-carboxyphenyl) [1,1':3',1 ''-terphenyI]-4,4 ''-dicarboxylic acid), based on Zr-6 clusters and tricarboxylate ligands has been constructed and characterized. The Zr-6 clusters were linked by BTB ligands to generate a 2D network of kgd topology. The interpenetrations among the 2D networks gave rise to a 3D porous framework, which represents the first Zr MOF constructed from 2D -> 3D interpenetration. The gas uptake and catalytic properties for 1 have also been studied.