Catalytic oxygen evolution from hydrogen peroxide by -[Co(en)Cl]@InBTB metal-organic framework catalytic system.

The diethylammonium counter-cations of the [EtNH][In(BTB)] metal-organic framework (InBTB MOF, BTB = 1,3,5-benzenetribenzoate) with an anionic framework can be effectively exchanged with cationic -[Co(en)Cl] complex ions through a simple cation-exchange process. The heterogenized -[Co(en)Cl]-encapsulated InBTB MOF (-[Co(en)Cl]@InBTB) catalytic system maintained the activity of the captured -[Co(en)Cl] complex ion for hydrogen peroxide decomposition in aqueous solution under mild reaction conditions. The captured -[Co(en)Cl] complex also exhibited - isomerization to produce either -[Co(en)Cl]@InBTB or -[Co(en)(HO)Cl]@InBTB based on IR spectroscopic investigation. The -[Co(en)Cl]@InBTB catalytic system showed high recyclability for oxygen evolution from hydrogen peroxide. The catalytic ability of -[Co(en)Cl]@InBTB was maintained up to seven times of recycling.