Inclusion compounds formation of poly(azomethine ether)s and β-cyclodextrin

In this study, two poly(azomethine ether)s were synthesized and they can form inclusion compounds (ICs) with -cyclodextrin (-CD). Fourier transform infrared (FTIR) spectroscopy, H-1 nuclear magnetic resonance spectroscopy (H-1-NMR), thermogravimetric analysis (TGA), X-ray diffraction (XRD) have been utilized to observe the formation of polymer-CD-ICs. The differentiation in their FTIR spectra may indicate the formation of the inclusion compounds between poly(azomethine ether)s and beta-CD. Compared the H-1-NMR of polymer-CD-ICs with beta-CD, proton signals belonging to both beta-CD and poly(azomethine ether)s can be found in the spectrum. The chemical shift of the protons H-3, H-5 has changed after the formation of inclusion compounds, which is perhaps due to the interaction of these protons with polymers. TGA scans showed the much higher decomposition temperatures observed for two polymer-CD-ICs may imply that polymer chains included inside the beta-CD's cavity can greatly improve beta-CD's stabilities. The X-ray diffraction patterns were confirmed to be the new crystal structures.