The Role of Intimate Dipole Carbonyl-Carbonyl and Hydrogen-Carbonyl Interactions in the Stereocomplexation and Crystallization: The Case of Poly(Cyclohexene Carbonate).

ABSTRACT: Enantiopure isotactic poly(cyclohexene carbonate) (PCHC) has been synthesized with chiral Zn-β-diiminate catalyst. PCHC crystallizes both as enantiopure polymer (R)-PCHC and (S)-PCHC and upon stereocomplexation of the two enantiomers. We report the crystal structures of the enantiopure polymer and of the stereocomplex (R/S)-PCHC and explain their crystallization based on the establishment of multiple attractive H---O═C interactions between oxygen atoms of carbonyl groups and the hydrogen atoms of the cyclohexyl rings and C═O---C═O intimate dipole interactions between carbonyl groups of chains of opposite chirality in the stereocomplex. The crystal structure of the enantiopure polymer is characterized by chains in 2/1 helical conformation packed in the orthorhombic unit cell with axes a = 1

SUBMITTER: D'Alterio MC 

PROVIDER: S-EPMC12668303 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature