In Situ Carboxylate-Functionalized {MoO}-Based Three-Dimensional Supramolecular Framework as a Copper-Triggered Heterogeneous Catalyst for Alkene Oxidation.

It is of great research value to develop an efficient and stable catalyst that can achieve the oxidation of alkenes to obtain epoxides, which can serve as a multifunctional intermediate with important commercial value. Based on this, a three-dimensional (3D) supramolecular framework H[Cu(Hbdcbpy)(MoO)(HO)] (, Hbdcbpy·2Cl = ,'-bis(3,5-dicarboxybenzyl-4,4'-bipyridine·dichloride) was obtained from carboxylate-functionalized 1D coordination polymers, which were derived from an unusual in situ [MoO] cluster and Cu-electron-deficient carboxylate complex units. The catalytic performance of in the epoxidation of alkenes using TBHP was examined, revealing its remarkable efficiency in the conversion of -cyclooctene, with a high conversion rate of 99% and an outstanding selectivity of 100%. Complex exhibited higher catalytic activity than the unmodified Hbdcbpy·2Cl, CuCl·2HO, and NaMoO·2HO, as well as the most previously reported polyoxometalate (POM)-based metal-organic complexes (POMOCs). Moreover, the reaction kinetics and mechanism of the catalytic reaction were explored using free radical trapping experiments and control experiments. The stability of catalyst was also investigated.