Synthesis, crystal structure and characterization a new ionic complex MoO2Cl3(MeOH)·H3tptz·Cl2 (tptz = 2,4,6-tris(2-pyridyl)-1,3,5-triazine) as epoxidation catalyst

Abstract

[MoO2Cl3(MeOH)]·H3tptz·Cl2 (1) (where tptz is 2,4,6-tris(2-pyridyl)-1,3,5-triazine) was prepared via reaction of MoO3 with tptz in a stoichiometric ratio of 1:1 in concentrated HCl at room temperature. It was characterized, by means of elemental analysis, FTIR, UV–Vis, 1H NMR and single-crystal X-ray diffraction. The asymmetric unit of the molybdenum(VI) salt 1 contains a 2,2′,2″-(1,3,5-triazine-2,4,6-triyl)tripyridinium cation, a cis-dioxotrichloridomethanolmolybdenum(VI) monoanion and two chloride anions to achieve electrical neutrality. The oppositely charged components in the structure of 1 are bound together by an intricate system of weak N(O)–H⋯Cl hydrogen bonds. The interactions between hydrogen bond donor and acceptor giving rise to three dimensional networks. It was also found that compound 1 successfully catalyzes the epoxidation of various alkenes such as cycoloctene, cyclohexene, norbornene, styrene, α-methyl styrene and trans-stilbene with 30–100% conversion and 80–100% selectivity using tert-butyl hydroperoxide (TBHP) as oxidant. The catalyst can be easily recovered from the reaction mixture and reused at least for three times without significant loss of activity. The superior antibacterial activity of 1 against Bacillus subtilis is also described in this presentation.