Spectral and Thermal Characterization of Halogen-Bonded Novel Crystalline Oligo(p-bromoacetophenone formaldehyde)

A novel oligomer p-bromoacetophenone-formaldehyde (OPBAF) was prepared by condensation polymerization in the presence of an acid as catalyst: It was characterized by FT-IR, NMR, pyrolysis GC/MS, XRD, GPC, and TG-DTG. The crystallographic parameters and space group for hexagonal OPBAF were a = b = 2.0810 angstrom and c = 9.2340 angstrom and P (3) over bar ml respectively. The degradation activation energy of the oligomer was studied by the Kissinger method. The kinetic parameters were also obtained. Halogen bonding interactions in the crystalline oligomers are identified between halogen center dot center dot center dot carbonyl and halogen center dot center dot center dot halogen. Little Correlation was found in the halogen bonding motifs exhibited as a function of bromine present in this Oligomer, and a unique bifurcated Br center dot center dot center dot Br/Br center dot center dot center dot O=C halogen bonding synthon was identified: This newly developed oligomer may be used as an interesting material for the development of 3D-designed structural products.