title: A porous framework polymer based on a zinc(II) 4,4'-bipyridine-2,6,2',6'-tetracarboxylate: synthesis, structure, and "zeolite-like" behaviors.
abstract: The robust metal-organic framework compound {[Zn(2)(L)] x 4H(2)O}(infinity) I has been synthesized by hydrothermal reaction of ZnCl(2) and 4,4'-bipyridine-2,6,2',6'-tetracarboxylic acid (H(4)L). Compound I crystallizes in a chiral space group, P4(2)2(1)2, with the chirality generated by the helical chains of hydrogen-bonded guest water molecules rather than by the coordination framework. Removal of guest water molecules from the crystal affords the porous material, [Zn(2)(L)](infinity) (II), which has very high thermal stability and is chemically inert. The N(2) isotherm of II at 77 K suggests a uniform porous structure with a BET surface area of 312.7 m(2)/g and a remarkably strong interaction with N(2) molecules (betaE(0) = 29.6 kJ mol(-)(1)). II also exhibits significant gas storage capacities of 1.08 wt % for H(2) at 4 bar and 77 K and 3.14 wt % (44.0 cm(3)/g, 67 v/v) for methane at 9 Bar at 298 K. The adsorption behavior of II toward organic solvent vapors has also been studied, and isotherms reveal that for different solvent vapors adsorption is dominated by two types of processes, absorbate-absorbate or absorbate-absorbent interactions. The adsorption and desorption kinetic processes in II are determined mainly by the molecular size of the guest species and their interaction with the host.
authors.affiliation: School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom.
authors.forename: Xiang
authors.initials: X
authors.lastname: Lin
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Blake
authors.forename: Claire
authors.initials: C
authors.lastname: Wilson
authors.forename: Xue Zhong
authors.initials: XZ
authors.lastname: Sun
authors.forename: Neil R
authors.initials: NR
authors.lastname: Champness
authors.forename: Michael W
authors.initials: MW
authors.lastname: George
authors.forename: Peter
authors.initials: P
authors.lastname: Hubberstey
authors.forename: Robert
authors.initials: R
authors.lastname: Mokaya
authors.forename: Martin
authors.initials: M
authors.lastname: Schröder