title: Supramolecular interactions induced hinge-like motion of a metal-organic framework accompanied by anisotropic thermal expansion.
abstract: A novel three-dimensional metal-organic framework (MOF), Ag4(tpt)4{δ-[Mo8O26]}·1.5H2O (A) (tpt = 2,4,6-tris(4-pyridyl)-1,3,5-triazine), possesses a ths-type topology with the hinge deformation mode. The single-crystal X-ray diffraction study shows that A and the dehydrated phase Ag4(tpt)4{δ-[Mo8O26]} (B) display distinct anisotropic thermal expansion with expansion in the b direction but contraction in the ac plane. This rare area negative thermal expansion (NTE) behavior is attributed to the hinged structure model and the supramolecular interactions (argentophilic interaction, π-π interaction) that act as the microscopic driving forces. In addition, supramolecular interactions also play a key role in thermochromic behavior of compound A.
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China. czlu@fjirsm.ac.cn.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Kuang
authors.forename: Xiaoyuan
authors.initials: X
authors.lastname: Wu
authors.forename: Wenbin
authors.initials: W
authors.lastname: Yang
authors.forename: Canzhong
authors.initials: C
authors.lastname: Lu