Exceptional TcO4 − sorption capacity and highly efficient ReO4 − luminescence sensing by Zr4+ MOFs

The sorption properties of [Zr6O4(OH)(4)(NH3+-BDC)(6)]Cl-6 center dot xH(2)O (MOR-1) and H-16[Zr6O16(H(2)PATP)(4)]Cl-8 center dot xH(2)O (MOR-2) towards ReO4- and TcO4- were studied in detail. Both MOR-1 and MOR-2 are very effective sorbents for ReO4- and TcO4- anions, with MOR-2 showing the highest sorption capacity (up to 4.1 +/- 0.4 mmol g(-1)) among the known metal organic materials. Importantly, the exceptional sorption capacity of MOR-2 is retained even under conditions simulating acidic nuclear waste. In addition, MOR-1 and MOR-2 exhibit selective luminescence ReO4- sensing properties, demonstrated for the first time for MOF materials.