title: Influence of water content on the self-assembly of metal-organic frameworks based on pyridine-3,5-dicarboxylate.
abstract: A 0D discrete molecule [Co(3,5-pdc)(H2O)5].2H2O (1) was obtained in quantitative yield from the reaction of CoCl2.6H2O and pyridine-3,5-dicarboxylate (3,5-pdc) in pure water solvent at ambient temperature. While a 1D zigzag chain species, [{Co(3,5-pdc)(H2O)4}.H2O]n (2), was produced in a water-rich environment, a 2D layer compound, [Co(3,5-pdc)(H2O)2]n (3), with a 6(3) topology was generated under a water-reduced condition and a 2D sheet structure, [{Cu(3,5-pdc)(py)2}.H2O.EtOH]n (4), was formed under a water-poor condition. Compounds 1, 2, and 4 were characterized by single-crystal X-ray diffraction analysis. The 1D zigzag chain 2 shows a recoverable collapsing property. Compound 4 adopts a 2D sheet structure with a 4.8(2) topology, observed for the first time for the 3,5-pdc-related metal-organic frameworks. Water content was found to be an important factor in determining the topologies of the products in the self-assembly of divalent metal ions (Co2+, Cu2+) and pyridine-3,5-dicarboxylate under mild conditions.
authors.affiliation: Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan.
authors.forename: Yi-Long
authors.initials: YL
authors.lastname: Lu
authors.forename: Jing-Yun
authors.initials: JY
authors.lastname: Wu
authors.forename: Ming-Che
authors.initials: MC
authors.lastname: Chan
authors.forename: Sheng-Ming
authors.initials: SM
authors.lastname: Huang
authors.forename: Chia-Shiang
authors.initials: CS
authors.lastname: Lin
authors.forename: Te-Wei
authors.initials: TW
authors.lastname: Chiu
authors.forename: Yen-Hsiang
authors.initials: YH
authors.lastname: Liu
authors.forename: Yuh-Sheng
authors.initials: YS
authors.lastname: Wen
authors.forename: Chuen-Her
authors.initials: CH
authors.lastname: Ueng
authors.forename: Tsung-Mei
authors.initials: TM
authors.lastname: Chin
authors.forename: Chen-Hsiung
authors.initials: CH
authors.lastname: Hung
authors.forename: Kuang-Lieh
authors.initials: KL
authors.lastname: Lu