Citation: WU Xiang-Wen, ZHANG Dong, WU Zhen-Hua, MA Jian-Ping. Two 3-D Neutral Zn(Ⅱ)-MOFs Generated from the Asymmetric Schiff-base Ligand[J]. Chinese Journal of Structural Chemistry, ;2014, 33(9): 1326-1332. shu

Two 3-D Neutral Zn(Ⅱ)-MOFs Generated from the Asymmetric Schiff-base Ligand

1.
College of Chemistry, Chemical Engineering and Materials Science, Key Laboratoryof Molecular and Nano Probes, Engineering Research Center of Pesticide and Medicine Intermediate Clean Production, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, Shandong Normal University, Jinan 250014, China

Corresponding author: MA Jian-Ping,
Received Date: 19 February 2014
Available Online: 23 May 2014
Fund Project: This work was supported by NSFC (No. 21201112) (No. 21201112)

Two new Zn(Ⅱ)-MOFs were synthesized based on an asymmetric Schiff-base ligand LH, which is obtained by the condensation of 5-formyl-8-hydroxyquinoline and 3-pyridinecarboxylic acid hydrazide. In different mixed solvents, we get two new isomorphism compounds,[Zn(L)₂]·C₄H₈O₂·2MeOH (1) and[Zn(L)₂]·CH₂Cl₂·2MeOH (2). Compounds 1 and 2 have been characterized by single-crystal X-ray diffraction, elemental analysis and IR. Compound 1 crystallizes in monoclinic, space group P2₁/c, with a=13.856(4), b=14.156(4), c=9.620(3) Å, β=110.167(5>)°, V=1771.3(9) Å³, Dc=1.500 g/cm³, C₃₈H₃₈N₈O₈Zn, M_r=800.13, F(000)=832, μ(MoKα)=0.761 mm^-1, Z=2, the final R=0.0596 and wR=0.1221 for 2112 observed reflections (I > 2σ(I)). Compound 2 belongs to monoclinic, space group P2₁/c, with a=13.575(3), b=14.130(3), c=9.485(2) Å, β=107.908(3)°, V=1731.2(6) Å³, Dc=1.529 g/cm³, C₃₅H₃₂C₁₂N₈O₆Zn, M_r=796.96, F(000)=820, μ(MoKα)=0.926 mm^-1, Z=2, the final R=0.0527 and wR=0.1395 for 2501 observed reflections (I > 2σ(I)). The Zn(Ⅱ) centers in both 1 and 2 display a distorted octahedral coordination geometry. The octahedral Zn(Ⅱ) nodes and L linkages build up 2-D nets consisting of parallelogram-like grids in the ab plane. The neighboring nets stack through hydrogen bonds to generate 3-D rhombic channels. In 1, the 1,4-dioxane and MeOH guests alternatively arrange in the channels and effectively take up the free space; while in 2, the CH₂Cl₂ guests are arranged in the channels. In addition, the encapsulated MeOH molecules are bonded to the framework by hydrogen bonds.
- Zn(Ⅱ),
- isomorphism,
- asymmetric Schiff-base ligand,
- channels,
- guests
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