A synthetic strategy to construct discrete indium-organic polyhedra has been illustrated based on small three-membered windows from a 2,5-pyridinedicarboxylate (PDC) ligand with an angle of 120 degrees. [Et2NH2](6)[In-6(PDC)(12)] (InOF-10) is a high-symmetry octahedron with eight three-membered windows, and [Et2NH2](18)[In-18(BPDC)(6)(PDC)(30)] (InOF-11) is a complex polyhedron derived from 3-edge-removed octahedra with an auxiliary biphenyl-3,3'-dicarboxylate (BPDC) ligand. Moreover, the sorption behavior of the latter is also well investigated.