Synthesis, structure and photocatalytic degradation of organic dyes of a copper(II) metal-organic framework (Cu-MOF) with a 4-coordinated three-dimensional CdSO4 topology

Metal-organic frameworks (MOFs) have attracted much interest in the fields of gas separation and storage, catalysis synthesis, nonlinear optics, sensors, luminescence, magnetism, photocatalysis gradation and crystal engineering because of their diverse properties and intriguing topologies. A Cu-MOF, namely poly[[(mu(2)-succinato-kappa O-2:O'){mu(2)-tris[4-(1,2,4-triazol-1-yl) phenyl] amine-2 N:N'} copper(II)] dihydrate], {[Cu(C4H4O4)(C24H18N10)]center dot 2H(2)O}(n) or {[Cu-(suc)(ttpa)]center dot 2H(2)O}(n), (I), was synthesized by the hydrothermal method using tris[4-(1,2,4-triazol-1-yl) phenyl] amine (ttpa) and succinate (suc(2-)), and characterized by IR, powder X-ray diffraction (PXRD), luminescence, optical band gap and valence band X-ray photoelectron spectroscopy (VB XPS). Cu-MOF (I) shows a twofold interpenetrating 4-coordinated three-dimensional CdSO4 topology with point symbol {6(5).8}. It presents good photocatalytic degradation of methylene blue (MB) and rhodamine B (RhB) under visible-light irradiation. A photocatalytic mechanism was proposed and confirmed.