Ni (II)-Salen ligand metal organic framework crystal material and preparation method and application thereof

The invention discloses a Ni (II)-Salen ligand metal organic framework crystal material and a preparation method and application thereof. The chemical formula of the material is {[Zn4O (L) 6]. DMF.H2O} n, wherein L is a dicarboxylic acid radical divalent anion of (R, R)-N, N '-bis (3-methyl-5-carboxyl salicylidene)-1, 2-diphenylethylenediamine nickel (II), and n is the polymerization degree. The metal organic framework crystal material is synthesized by a solvothermal synthesis method, which is simple to operate, low in cost, high in yield and easy for large-scale industrial production. The prepared metal organic framework crystal material has high thermal stability (400 DEG C), and the BET specific surface area is 228m /g. And the adsorption quantity of CO2 at 273K and 1atm is 18.8 m /g. In the presence of an oxidizing agent, styrene is catalyzed to be selectively oxidized to generate benzaldehyde in a water phase, the yield reaches 99%, the catalyst is recycled for five times, and the activity loss is small