A novel cobalt metal-organic framework with an anionic 3D network built up from two interconnected NbO subnets

The solvothermal reaction of cobalt chloride and 4,4′,4″-nitrilotrisbenzoic acid (H3NTB) in N,N′-dimethylformamide (DMF) affords a new three-dimensional Co-NTB compound with an empirical formula of HDMA2[Co5(NTB)4(H2O)3(DMA)]·7DMF (HDMA+, dimethylammonium). Its anionic network is built up from two connected NbO subnets and presents large hexagonal and small triangular channels containing the cations and the solvent molecules.

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► 3D coordination polymer built from two NbO subnetworks.
► Synthesis of new cobalt MOF based on the redox active NTB3− tritopic carboxylate.
► 3D MOF built from two types of metal units.
► Anionic extra large open network with organic cationic guests.
► Large hydrophobic hexagonal channels and small hydrophilic triangular ones.