Abstract
Smart corrosion-inhibiting coatings generate or release an inhibitor only when demanded by the initiation of corrosion. Supramolecular nanocontainers of the α-cyclodextrin (α-CD) corrosion inhibitor were prepared by inclusion complex (IC) formation between α-CD and 2-mercaptobenzothiazole (MBT) or 2-mercaptobenzimidazole (MBI) under various conditions (at room temperature and under sonic energy). The structure of the supramolecular nanocontainers was characterized by hydrogen nuclear magnetic resonance (1H-NMR), x-ray diffraction (XRD), scanning electron microscopy (SEM) and fourier transform infrared spectroscopy (FTIR). Supramolecular nanocontainer formation between MBT and MBI with α-CD in solid phase was emphasized by the significant differences between the 1H-NMR, FTIR and XRD spectra of the physical mixtures with respect to those of the complexes. The crystalline complexes adopted a head to head channel-type and cage conformation for α-CD/MBT and α-CD/MBI inclusion complexes, respectively.
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