Catalytic oxygen evolution from hydrogen peroxide by trans-[Co(en)2Cl2]@InBTB metal-organic framework catalytic system

The diethylammonium counter-cations of the [Et2NH2](3)[In-3(BTB)(4)] metal-organic framework (InBTB MOF, BTB = 1,3,5-benzenetribenzoate) with an anionic framework can be effectively exchanged with cationic trans-[Co(en)(2)Cl-2](+) complex ions through a simple cation-exchange process. The heterogenized trans-[Co(en)(2)Cl-2](+)-encapsulated InBTB MOF (trans-[Co(en)(2)Cl-2]@InBTB) catalytic system maintained the activity of the captured trans-[Co(en)(2)Cl-2](+) complex ion for hydrogen peroxide decomposition in aqueous solution under mild reaction conditions. The captured trans-[Co(en)(2)Cl-2](+) complex also exhibited trans-cis isomerization to produce either cis-[Co(en)(2)Cl-2]@InBTB or cis-[Co(en)(2)(H2O)Cl]@InBTB based on IR spectroscopic investigation. The trans-[Co(en)(2)Cl-2]@InBTB catalytic system showed high recyclability for oxygen evolution from hydrogen peroxide. The catalytic ability of trans-[Co(en)(2)Cl-2]@InBTB was maintained up to seven times of recycling.

Automated summary

The diethylammonium counter-cations of InBTB MOF can be effectively exchanged with cationic trans-[Co(en)(2)Cl-2](+) complex ions through a simple cation-exchange process. The heterogenized trans-[Co(en)(2)Cl-2]@InBTB catalytic system showed high recyclability for hydrogen peroxide decomposition and exhibited trans-cis isomerization. The catalytic ability of trans-[Co(en)(2)Cl-2]@InBTB could be maintained up to seven times of recycling.