Copper(II) and Vanadium(IV) Complexes of New Modified Poly(vinyl chloride) Schiff Base for Catalytic Studies in Knoevenagel Condensation

At first, new pendant Schiff base PVC-en-۳MSSB was prepared by modification of PVC at the presence of ethylene diamine and ۳-methoxy salicylaldehde (۳MS). Then, from the reaction of PVC-en-۳MSSB and Cu(OAC)۲ or VO(acac)۲, PVC pendant complexes PVC-en-۳MSSB-Cu (۱) and PVC-en-۳MSSB-VO (۲) were prepared. All compounds were characterized by FT-IR, XRD, TGA, DTA and TEM. FT-IR and XRD results confirmed the preparation of all compounds. TGA results show that the stability of complex ۱ is higher than ۲ and PVC-en-۳MSSB. In addition, the catalytic properties of the complexes in Knoevenagel condensation for synthesis of ۴-hydroxysalicydenebarbituric acid are investigated and the results show that the vanadium(IV) complex has a better catalytic properties.

Keywords:

Poly(Vinyl Chloride) , Pendant Schiff base , Modification , Knoevenagel condensation