Crystal Polymorphism of Curdlan Propionate: 6-Fold versus 5-Fold Helices

Hironori Marubayashi, Kazuyori Yukinaka, Yukiko Enomoto-Rogers, Takaaki Hikima, Masaki Takata, Tadahisa Iwata

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The molecular and crystal structures of curdlan propionate (CDPr) were examined by the X-ray fiber diffraction methods combined with energy calculations. CDPr forms two different crystal structures (CDPr forms I and II) depending on annealing conditions: solvent-annealing yields CDPr form I, whereas thermal-annealing gives CDPr form II. In CDPr form I, the 6/1 helix is packed in the hexagonal unit cell with a = b = 1.154 nm, and c (fiber axis) = 2.287 nm. In the case of CDPr form II, the 5/1 helix is packed in the pseudohexagonal cell with a = b = 1.175 nm, and c (fiber axis) = 1.859 nm. The crystal transition from CDPr forms I to II occurs by thermal-annealing at temperatures ≥ 160 °C.

Original languageEnglish
Pages (from-to)607-611
Number of pages5
JournalACS Macro Letters
Volume5
Issue number5
DOIs
Publication statusPublished - 2016 May 17
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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