title: Uniaxial movements of a metal-cyanide framework switched by weak interactions through dehydration and rehydration.
abstract: A metal-cyanide framework undergoes a dehydration-rehydration triggered reversible single-crystal-to-single-crystal transformation. The resulting accordion-like contraction-expansion corresponds to a size change along the c axis as much as 24 %. This anisotropic response arises from the cooperativity among the water molecules, K ions, and CN groups between the unique two-dimensional bimetallic layers through weak interactions of hydrogen bonds and electrostatic (ionic) interactions. The key role of the water molecules in the dehydration-rehydration process is revealed by solid-state (1)H NMR spectroscopy and dielectric measurements.
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Jiangning District, Nanjing 211189 (P. R. China), Fax: (+86) 25-5209-0626.
authors.forename: Bin
authors.initials: B
authors.lastname: Wei
authors.forename: Ran
authors.initials: R
authors.lastname: Shang
authors.forename: Xi
authors.initials: X
authors.lastname: Zhang
authors.forename: Xiu-Dan
authors.initials: XD
authors.lastname: Shao
authors.forename: Ye-Feng
authors.initials: YF
authors.lastname: Yao
authors.forename: Zhe-Ming
authors.initials: ZM
authors.lastname: Wang
authors.forename: Ren-Gen
authors.initials: RG
authors.lastname: Xiong
authors.forename: Wen
authors.initials: W
authors.lastname: Zhang
keywords: crystal engineering; cyanide; dehydration-rehydration; iron; metal-organic frameworks