The crystal structure of poly(7-heptalactone) (PHL) is presented. PHL has been synthesized by a combination of ring-opening polymerization of η-heptalactone and reversible addition−fragmentation chain transfer polymerization using diphenyl phosphate as catalyst. The noncommercial available η- heptalactone monomer has been prepared by oxidation of cycloheptanone. The crystal structure of PHL has been determined by analysis of the X-ray powder diffraction profiles and of the electron diffraction patterns of single crystals and calculations of lattice energy. The structure has been refined with the Rietveld full-profile refinement. Chains in trans planar conformation are packed in an orthorhombic unit cell with axes a = 7.37 Å, b = 5.05 Å, and c = 10.07 Å according to the space group symmetry P21.
Crystal Structure of Poly(7-heptalactone) / Malafronte, Anna; Scoti, Miriam; Rosaria Caputo, Maria; Li, Bo; O’ Reilly, Rachel K.; Dove, Andrew P.; Müller, Alejandro J.; DE ROSA, Claudio. - In: MACROMOLECULES. - ISSN 1520-5835. - 56:11(2023), pp. 4153-4162. [10.1021/acs.macromol.3c00710]
Crystal Structure of Poly(7-heptalactone)
Anna Malafronte
;Miriam Scoti;Claudio De Rosa
2023
Abstract
The crystal structure of poly(7-heptalactone) (PHL) is presented. PHL has been synthesized by a combination of ring-opening polymerization of η-heptalactone and reversible addition−fragmentation chain transfer polymerization using diphenyl phosphate as catalyst. The noncommercial available η- heptalactone monomer has been prepared by oxidation of cycloheptanone. The crystal structure of PHL has been determined by analysis of the X-ray powder diffraction profiles and of the electron diffraction patterns of single crystals and calculations of lattice energy. The structure has been refined with the Rietveld full-profile refinement. Chains in trans planar conformation are packed in an orthorhombic unit cell with axes a = 7.37 Å, b = 5.05 Å, and c = 10.07 Å according to the space group symmetry P21.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
