A novel highly crystalline MOF-74 series consisting of an anthracene-based building block and five different divalent metal ions is presented. The MOFs combine photoluminescence with high surface areas and electrical conductivity.

Co3O4/CoFe2O4 decorated on nickel foam (NF/Co3O4/CoFe2O4) was synthesized from a metal–organic framework by a solvothermal approach using nicotinic acid as an organic linker followed by annealing at 500 °C. The electrochemical activity of NF/Co3O4/CoFe2O4 for the oxygen evolution reaction (OER) was assessed in alkaline medium. Under basic conditions (pH > 10), the composite electrode revealed enhanced electrocatalytic OER activity requiring an overpotential of 215 mV versus RHE to reach 10 mA cm–2 with a Tafel slope of 90 mV dec–1. The enhanced OER activity was ascribed to the presence of Co3+ and Fe3+ in the octahedral sites of Co3O4 and CoFe2O4, respectively, and their synergic effect in Co3O4/CoFe2O4. This anode showed a stable current density of about 160 mA cm–2 for 20 h; the same Co3O4/CoFe2O4/NF anode was applied for several OER experiments without loss of activity.

We report the synthesis of au nique cubic metalorganic framework (MOF), Fe-HHTP-MOF,c omprising hexahydroxytriphenylene (HHTP) supertetrahedral units and Fe III ions,a rranged in ad iamond topology.T he MOF is synthesized under solvothermal conditions,y ielding ah ighly crystalline,deep black powder,with crystallites of 300-500 nm sizea nd tetrahedral morphology.N itrogen sorption analysis indicates ahighly porous material with as urface area exceeding 1400 m 2 g À1 .F urthermore,F e-HHTP-MOF shows broadband absorption from 475 up to 1900 nm with excellent absorption capability of 98.5 %o ft he incoming light over the visible spectral region. Electrical conductivity measurements of pressed pellets reveal ahigh intrinsic electrical conductivity of up to 10 À3 Scm À1 .Q uantum mechanical calculations predict Fe-HHTP-MOF to be an efficient electron conductor,exhibiting continuous charge-carrier pathwayst hroughout the structure.

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