Four　water-soluble　cage-like　hosts　(1.4NO(3)(-):　{[(bpy)(2)Pd-2](2)L-2(1)}(NO3)(4),　2.4NO(3)(-):　{{[(bpy)(2)Pd-2](2)L-2(2)}(NO3)(4),　3.6NO(3)(-):　{[(bpy)(2)Pd-2](2)L-2(3)}(NO3)(6　)and　4.6NO(3)(-):　{[(bpy)(2)Pd-2](2)L-2(4)}(NO3)(6)　have　been　successfully　self-assembled　by　coordinating　the　flexible　amide　based　polypyrazole　ligands　(H2L1:　N-1,N-4-di(1H-pyrazol-5-yl)terephthalamide,　H2L2:　N-1,N-4-bis(3-methyl-1H-pyrazol-5-yl)-terephthalamide,　H3L3:　N-1,N-3,N-5-tri(1H-pyrazol-5-yl)benzene-1,3,5-tricarboxamide　and　H3L4:　N-1,N-3,N-5-tris(3-methyl-1H-pyrazol-5-yl)benzene-1,3,5-tricarboxamide)　with　dipalladium　corners　([(bpy)(2)Pd-2(NO3)(2)](NO3)(2),　where　bpy　=　2,2＇-bipyridine)　in　aqueous　solution.　Their　structures　were　characterized　by　H-1　NMR,　ESI-MS　and　single-crystal　X-ray　diffraction.　Notably,　all　the　four　supramolecular　assemblies　are　capable　of　adsorbing　iodine　molecules　via　halogen　bonds　and　other　supramolecular　interactions.