Two novel metal–organic frameworks (MOFs), namely [Co2(L1)(L2)]·4.25H2O (1) and [Cd4(L1)2(L2)2]·4H2O·DMF (2) (H4L1 = tetrakis[4-(carboxyphenyl)-oxamethyl]methane acid and L2 = tetrakis(imidazol-1-ylmethyl)methane), have been hydrothermally synthesized. Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by infrared spectra (IR), elemental analyses, powder X-ray diffraction (PXRD), thermogravimetric (TG) analyses, UV-vis absorption spectra, optical energy gap and emission spectra. In 1, tetrahedral L1 and L2 ligands link neighboring Co(II) atoms to generate a unique 3D self-penetrating framework with a tetranodal 4-connected (6·85)2(63·83)(86) topology. However, in 2, Cd(II) atoms are bridged by L1 and L2 ligands to furnish a 3D framework with a highly rare (4,8)-connected (46)(44·62)(410·614·74) topology. In addition, compound 1 exhibits photocatalytic activity for dye degradation under UV light or visible-light and shows good stability toward photocatalysis.
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