title: Pentagonal helices in a periodic metal-organic framework. Crystals as computers for discovering structures of minimal transitivity.
abstract: The structure of a recently-published metal-organic framework is deconstructed into its underlying net which is found to be of exceptional complexity. It is shown that this is because of local pentagonal symmetry and the structure is in fact the simplest possible (minimal transitivity) given that local symmetry.
authors.affiliation: Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Guangdong 515063, People's Republic of China.
authors.forename: Mian
authors.initials: M
authors.lastname: Li
authors.forename: Dan
authors.initials: D
authors.lastname: Li
authors.forename: Michael
authors.initials: M
authors.lastname: O'Keeffe
authors.forename: Zhong-Min
authors.initials: ZM
authors.lastname: Su