[CH3 NH3 ]4 Ga4 SbS9 S0.28 O0.72 H: A Three-Dimensionally Open-Framework Heterometallic Chalcogenidoantimonate Exhibiting Ni2+ Ion-Exchange Property.

An open-framework chalcogenidoantimonate, namely, [CH3 NH3 ]4 Ga4 SbS9 S0.28 O0.72 H (1), has been solvothermally synthesized and structurally characterized. Interestingly, 1 showed Ni2+ ion-exchange properties and wide pH resistance, with a maximum exchange capacity of 76.9 mg g-1 . To the best of our knowledge, this is the first example of amine-directed three-dimensional (3D) heterometallic chalcogenidometalates for highly selective Ni2+ ion capture with a high distribution coefficient (Kd =1.65×105  mL g-1 ).