For an industrially relevant specialty polymer, poly(2,6-dimethyl-1,4-phenylene) oxide (PPO), for the first time, a crystalline structure is resolved. It is a co-crystalline structure of the polymer with a chiral guest molecule (alpha-pinene), exhibiting a 2/1 monomer-unit-guest molar ratio. The most relevant feature of this co-crystalline structure is its chirality. In fact, the unit cell includes all left- or right-handed polymer helices and (1S)-(-)- or (1R)-(+)-alpha-pinene guest molecules, respectively. The induction of non-racemic macromolecular helicity in the co-crystalline structure, clearly confirmed by VCD measurements, leads to amplification of chirality. Guest extraction procedures from the PPO-alpha-pinene co-crystalline form produce optically inactive nanoporous-crystalline modifications, which present high sorption ability toward organic compounds.
A chiral co-crystalline form of poly(2,6-dimethyl-1,4-phenylene)oxide (PPO) / Tarallo, Oreste; V., Petraccone; C., Daniel; G., Fasano; P., Rizzo; G., Guerra. - In: JOURNAL OF MATERIALS CHEMISTRY. - ISSN 0959-9428. - 22:(2012), pp. 11672-11680. [10.1039/c2jm30907f]
A chiral co-crystalline form of poly(2,6-dimethyl-1,4-phenylene)oxide (PPO)
TARALLO, ORESTE;
2012
Abstract
For an industrially relevant specialty polymer, poly(2,6-dimethyl-1,4-phenylene) oxide (PPO), for the first time, a crystalline structure is resolved. It is a co-crystalline structure of the polymer with a chiral guest molecule (alpha-pinene), exhibiting a 2/1 monomer-unit-guest molar ratio. The most relevant feature of this co-crystalline structure is its chirality. In fact, the unit cell includes all left- or right-handed polymer helices and (1S)-(-)- or (1R)-(+)-alpha-pinene guest molecules, respectively. The induction of non-racemic macromolecular helicity in the co-crystalline structure, clearly confirmed by VCD measurements, leads to amplification of chirality. Guest extraction procedures from the PPO-alpha-pinene co-crystalline form produce optically inactive nanoporous-crystalline modifications, which present high sorption ability toward organic compounds.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.