IMMOBILIZATION OF RUTHENIUM SCHIFF BASE COMPLEX IN THE METAL ORGANIC FRAMEWORK UiO-67

Zirconium-based metal-organic framework. UiO-67, was synthesized and used as support for the immobilization of the [RuCl2(ENAPY)] (ENAPY = N,N'-bis(7-metal-2-pyridylmethylene)-1,2-diiminoethane)). The immobilized system exhibited violet blue color. The {UiO-67/[RuCl2(ENAPY)]} was characterized by cyclic voltammetry, X-ray diffraction, LTV-Vis, FTIR and X-ray photoelectron spectroscopy. The electrochemistry of the inunobilized system is characterized by a reversible pair of waves at +0.40 V (vs NIIE), ascribed to the Ru3+/2+ redox process. The electronic spectrum of the immobilized system is characterized by bands at 520 and 380 nm ascribed to a ligand-to-metal charge-transfer transitions {Ru2+(d(pi)) -> ENAPY(p(pi)*)}. The IR hands of immobilized complex {1630 cm(-1) (nu(asC=C)), 1590 cm(-1) (nu(asC=N)), 1450 cm(-1) (nu(sC=C)), 1340 cm(-1) (nu(sC=C))} are weak in comparison with the neat complex due to their low concentration in MOP cases. X-ray diffractogram of the immobilized system indicated that the crystallinity and morphology of UiO-67 was preserved during inclusion of ruthenium complex. The XPS spectra of UiO-67 and UiO-67/ruthenium complex shows a signal at 462 eV that can be ascribed to Ru 3p(3/2). and at 400 eV ascribed to N Is core level of the ruthenium Schiff base complex immobilized into MOF.