Synthesis and characterization of inclusion complexes of aliphatic-aromatic poly(Schiff base)s with β-cyclodextrin (highlight)

This paper describes the formation of polymer inclusion complexes(polymer-CD-ICs) between beta-cyclodextrin(beta-CD) and aliphatic-aromatic poly(Schiff base)s. Fourier transform infrared(FTIR) spectroscopy, H-1 nuclear magnetic resonance spectroscopy(H-1-NMR), thermogravimetric analysis(TGA) and X-ray diffraction(XRD) have been used to observe the formation of polymer-CD-ICs. In FTIR spectra, the characteristic peaks of beta-CD at 3391 cm(-1) shifted to 3418 cm(-1) and the intense peak at 1602 cm(-1) due to the -C = N- stretching vibration diminished after formation of inclusion complexes. Compared the H-1-NMR of polymer-CD-ICs with beta-CD, the chemical shift of the protons H-3, H-5 have shifted to higher field after the formation of inclusion complexes, which is perhaps due to the interaction of these protons with polymers. The TGA analysis revealed that the polymer-CD-ICs had better thermal stability than beta-CD, suggesting that the polymer increased the stability of beta-CD. The X-ray diffraction patterns displayed that the strong peak for both polymer-CD-ICs at approximately 20.0 degrees (2 theta) may confirm their IC formation.