A unique microporous cationic metal–organic framework, namely [Cd(tipo)(HCOO)(H2O)]·NO3·DMF (1), has been synthesized and structurally characterized [tipo = tris(4-(1H-imidazol-1-yl)phosphine oxide)]. This compound exhibits rapid and selective separation of methyl orange. Meanwhile, it has also been developed as a potential adsorbent material for the efficient removal of Cr2O72− from aqueous solutions with a high uptake of up to 228 mg g−1.
