Abstract
The 6-OH group of β-cyclodextrin was modified by diethylene triamine and triethylene tetramine, respectively, mono[6-diethylenetriamino]-6-deoxy-β-cyclodextrin (DTCD) and mono[6-triethylenetetraamino]-6-deoxy-β-cyclodextrin (TTCD) were synthesized, which included 1,5-naphthalenediamine and 1,8-naphthalenediamine, respectively, in the presence of rare earth metal yttrium chloride. As a result, four ternary inclusion complexes (host–guest-metal) formed, which were characterized via 1HNMR spectroscopy. The chemical shift variations of host and guest molecules were studied. The stoichiometric proportion of host and guest molecules is 2:1 for all the complexes. Signal degeneration still exists for the guest molecules after the inclusion process, which verifies the symmetrical conformation of guest molecules inside the cavities of two host molecules. All the four complexes exhibit “sandwich”-typed structure.
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