Preparation and Crystal Structures of New Schiff Bases Derived From 3, 3ʹ-Dihydroxy-4, 4ʹ-(Propane-1, 2-Dieloxy)-Dibenzaldehyde

In this research study, two schiff base compounds ap-dhpdb (1) synthesized from the reaction of 2-aminophenol (ap) with 3, 3ʹ-dihydroxy-4, 4ʹ-(propane-1, 2-dieloxy)-dibenzaldehyde (dhpdb) and fa-dhedb (2) synthesized from the reaction of furfuryl amine (fa) with 3, 3ʹ-dihydroxy-4, 4ʹ-(ethane-1, 2-dieloxy)-dibenzaldehyde (dhedb) by reflux in methanol as solvent for 2 h. suitable crystals of 1 and 2 get by slow evaporation of solvent after few days and characterized by elemental analysis. crystal structures of the title compounds 1 and 2 were determined using the single crystal x-ray diffraction analysis. the title compounds 1 and 2 were found to be in monoclinic and orthorhombic with the space group of c2/c and pnca, respectively. the unit cell parameter of 1 were a=29/8994(10), b=4.86618(7), c=21.7214(4) å, β=124.4901(17)˚ and v=2604.85(12) å3, and the unit cell parameter of 2 were a=22/3513(7), b=26.0250(7), c=4.6681(9) å and v=2715(12) å3. the c-n bond distances around the iminic nitrogen of compound 1 are 1.418 and 1.268 å, and in compound 2 are 1.467 and 1.269 å, indicated the single and double bonds, respectively. also, the bond angles around the iminic nitrogen are distorted from 120˚ corresponding to sp2 hybrid (n1-c7-c8 = 122.5˚ and c6-n1-c7 = 119.3˚ for 1 and n7-c8-c9 = 123.9˚ and c6-n7-c8 = 116.12˚ for 2).