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Spectral and Thermal Characterization of Halogen-Bonded Novel Crystalline Oligo(<i>p</i>鈥慴romoacetophenone formaldehyde)
A novel oligomer <i>p</i>-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 <i>a</i> = <i>b</i> = 2.0810 脜 and <i>c</i> = 9.2340 脜 and <i>P</i>3虆<i>m</i>1, 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路路路carbonyl
and halogen路路路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路路路Br/Br路路路O顥籆
halogen bonding synthon was identified. This newly developed oligomer
may be used as an interesting material for the development of 3D-designed
structural products