Four novel Z-shaped hexanuclear vanadium oxide clusters as efficient heterogeneous catalysts for cycloaddition of CO2 and oxidative desulfurization reactions

Chemical fixation of CO2 into C1 source,as a general approach,can effectively alleviate the emission of greenhouse gasses.Whereas,the challenge posed by the need for efficient catalysts with high catalytic active sites still exists.In this work,we reported a series of new hexavana-date clusters,[(C6H6ON)2(C2H8N2)2(CH3O)6VⅣ6O8](V6-1),[(C6H6ON)2(C3H10N2)2(CH3O)6VⅣ6O8](V6-2),[(C6H6ON)2(C6H14N2)2(CH3O)6VⅣ6O8](V6-3)and[(C6H6ON)2(C4H-nN2O)2(CH3O)4VⅣ6O8](V6-4),as-sembled by 2-aminophenol and four different kinds of Lewis bases(LB),ethanediamine(en),1,2-diaminopropane,1,2-cyclohexanediamine and N-(2-hydroxyethyl)ethylenediamine(ben)together.Among them,the basic unit{V6}cluster featured Z-shaped configuration represents a brand-new example of hex-anuclear vanadium clusters.Remarkably,the catalytic tests demonstrated that V6-1 as catalyst displays high catalytic activity in the cycloaddition for the CO2 fixation into cyclic carbonates by virtue of open V sites.As expected,for oxidative desulfurization of sulfides,V6-1 also exhibits satisfied catalytic effective-ness.Furthermore,the recycling test confirmed that catalyst V6-1 may be a bifunctional heterogeneous catalyst with great promise for both CO2 cycloaddition and oxidative desulfurization reactions.