Construction of Metal鈥揙rganic Frameworks Based on Two Neutral Tetradentate Ligands
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- 作者：Ling Qin ; Jinsong Hu ; Mingdao Zhang ; Yizhi Li ; Hegen Zheng
- 刊名：Crystal Growth & Design
- 出版年：2012
- 出版时间：October 3, 2012
- 年：2012
- 卷：12
- 期：10
- 页码：4911-4918
- 全文大小：475K
- 年卷期：v.12,no.10(October 3, 2012)
- ISSN：1528-7505
文摘
The solvothermal reaction of two new neutral tetradentate ligands with different bivalent metal salts gave seven metal鈥搊rganic frameworks (MOFs): [Co2(L1) (trans-chdc)2]路5H2O (1), [Zn2(L1)(trans-chdc)(NO2)2]路DMF (2), [Cd2(L1)(trans-chdc)2]路4H2O (3), [Zn2(L1)(1,4-bdc)2]路(H2O)3 (4), [Cd2(L1)(1,4-bdc)2]路DMF路(solvent)x (5), [Co(L2) (trans-chdc)(H2O)]路1.5H2O (6), [Co(L2) (1,4-bdc) (H2O)] 路 2H2O (7), (L1 = 1,1鈥?oxybis[3,5-diimidazole]-benzene, L2 = 1,1鈥?oxybis[3,5-dipyridine]-benzene, trans-chdc = trans-1,4-cyclohexanedicarboxylic acid, 1,4-bdc = 1,4-benzenedicarboxylate). These MOFs were prepared to examine the effects of the core metal ion or organic ligand on the topology and interpenetration form. The results show that the imidazole ligand can rotate easily to coordinate to metal ions, while pyridine ligand exhibits the weaker coordinative abilities, which may influence the self-assembly. Compounds 1, 3, and 5 are three-dimensional (3D) frameworks with 2-fold interpenetrated forms, whereas complex 4 shows a 3-fold interpenetrated structure. Interestingly, compound 2 exhibits a 4-fold interpenetration. Compound 6 features a two-dimensional polymeric layer structure which exhibits a rare 2-fold interpenetrating 3D hms array if H-bonds are taken into account. For compound 7, the dinuclear cobalt secondary building unit (SBU) assembles with mixed ligands L2 and 1,4-bdc to construct a 3D 伪-Po structure.