title: Flexible porous coordination polymers constructed from 1,2-bis(4-pyridyl)hydrazine via solvothermal in situ reduction of 4,4'-azopyridine.
abstract: Solvothermal reactions of Zn(NO(3))(2), 1,4-benzenedicarboxylic acid (H(2)bdc), and 4,4'-azopyridine (azpy) in different conditions yielded [Zn(bdc)(bphy)]·DMF·H(2)O (1a, bphy = 1,2-bis(4-pyridyl)hydrazine, DMF = N,N-dimethylformamide) and [Zn(bdc)(bphy)]·EtOH·H(2)O (1b) with two-fold interpenetrated dmp topology and [Zn(2)(bdc)(2)(bphy)]·1.5EtOH·H(2)O (2a) and [Zn(2)(bdc)(2)(bphy)]·DMA·1.5H(2)O (2b, DMA = N,N-dimethylacetamide) with two-fold interpenetrated pcu topology. The in situ reduction of azpy to bphy was confirmed by single-crystal structures and LC-MS analyses of the acid-digested crystalline samples, as well as controlled solvothermal experiments. Removal of the guest molecules in 1a/1b and 2a/2b converts the materials to guest-free phases [Zn(bdc)(bphy)] (1) and [Zn(2)(bdc)(2)(bphy)] (2), respectively, which were identified by PXRD. CO(2) sorption experiments performed at 195 and 298 K showed low porosity for 1 and gated sorption behavior for 2. At 298 K, 2 exhibits high selectivity for adsorbing CO(2) over CH(4).
authors.affiliation: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, 510275, PR China.
authors.forename: Xiao-Min
authors.initials: XM
authors.lastname: Liu
authors.forename: Lin-Hua
authors.initials: LH
authors.lastname: Xie
authors.forename: Jian-Bin
authors.initials: JB
authors.lastname: Lin
authors.forename: Rui-Biao
authors.initials: RB
authors.lastname: Lin
authors.forename: Jie-Peng
authors.initials: JP
authors.lastname: Zhang
authors.forename: Xiao-Ming
authors.initials: XM
authors.lastname: Chen