Influence of water content on the self-assembly of metal-organic frameworks based on pyridine-3,5-dicarboxylate.
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.
Lu
Yi-Long
YL
Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan.
Wu
Jing-Yun
JY
Chan
Ming-Che
MC
Huang
Sheng-Ming
SM
Lin
Chia-Shiang
CS
Chiu
Te-Wei
TW
Liu
Yen-Hsiang
YH
Wen
Yuh-Sheng
YS
Ueng
Chuen-Her
CH
Chin
Tsung-Mei
TM
Hung
Chen-Hsiung
CH
Lu
Kuang-Lieh
KL