3-Cyclodextrin (/3-CD) and y-cyclodextrin (y-CD) form inclusion complexes with polypropylene glycol)s (PPG) of various molecular weights to give stoichiometric compounds in crystalline states. -Cyclodextrin (a-CD) did not form complexes with PPG of any molecular weight, ß-and y-CD did not form complexes with the low molecular weight analogs, such as propylene glycol, di(propylene glycol), and tri(propylene glycol). The yields of the complexes of ß-and y-CD with PPG increased with increasing molecular weight (MW) of the PPG and reached a maximum at about MW 1000; yield decreased with a further increase in the MW. They were isolated and found to be 2:1 (monomer unit:CD). The complexes were characterized by IR, NMR, 13C NMR, 13C CP/MAS NMR, and 13C PST/MAS NMR spectra and X-ray (powder), thermal, and elemental analyses. Complex formation of CDs with PPG derivatives has also been studied. The structures of the complexes are discussed. Complex formation of /3-CD with atactic and isotactic PPG has been compared.

β-Cyclodextrin (β-CD) and γ-cyclodextrin (γ-CD) formed inclusion complexes with polyisobutylene (PIB) of various molecular weights to give stoichiometric compounds in crystalline states. R-Cyclodextrin (R-CD) did not form complexes with PIB of any molecular weight. The yields of the complexes with β-CD decreased with an increase in the molecular weight of PIB. In contrast, the yields of the complexes with γ-CD increased with an increase in the molecular weight and the complexes were obtained almost quantitatively with PIB of molecular weight 1350. The chain-length selectivity is reversed between β-CD and γ-CD. The inclusion complexes were isolated and found to be 3:1 (monomer unit:CD). The complexes were characterized by IR, 1 H NMR, 13 C NMR, 13 C CP/MAS NMR, 13 C PST/MAS NMR spectra, and X-ray (powder), thermal, and elemental analyses. The structures of the complexes are discussed.

Cyclodextrins (CDs) have been found to form inclusion complexes with poly(ε-caprolactone) (PEC) to give crystalline compounds. α- and γ-CD formed complexes with these polyesters in high yields, although β-CD gave complexes in moderate yields. The yields of the complexes decreased with increasing molecular weight of the polymer. α-CD−PEC complexes are stoichiometric one-to-one (cyclodextrin:monomer unit) compounds, and γ-CD−PEC complexes are one-to-two compounds when the molecular weights of PEC are low. The complexes were isolated and characterized by 1H NMR, 13C CP/MAS NMR, and X-ray diffraction studies. The inclusion modes are discussed.

Cyclodextrins (CDs) were found to form inclusion complexes with aliphatic polyesters [-O(CH2)xOCO(CH2)4CO]n (where x ) 2, 3, or 4) to give crystalline compounds. R-and γ-CD formed complexes with these polyesters in high yields, although β-CD gave complexes in moderate yields. Although the yields of the complexes of R-CD with poly(trimethylene adipate) (PTA) (x ) 3) and poly-(1,4-butylene adipate) (PBA) (x ) 4) decreased with increasing molecular weight, R-CD formed complexes with poly(ethylene adipate) (PEA) (x ) 2) in high yields even at higher molecular weights. The yields of the complexes of γ-CD with these polyesters showed a maximum at the molecular weight of 1000. The complexes were isolated and characterized by FTIR, 1 H NMR, 13 C CP/MAS NMR spectra, and X-ray diffraction studies. The inclusion modes are discussed.

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