251. Constructing various metal-organic frameworks by mixed pyridine-acylamide and carboxylate ligands: ring-like or helical building blocks.
- Author
-
Xiao-min Zhang, Yang Ning, Li-na Meng, Jian-qiang Li, Ming-biao Luo, and Feng Luo
- Subjects
PYRIDINE ,CARBOXYLATES ,CHEMICAL synthesis ,LIGANDS (Chemistry) ,CARBOXAMIDES ,ORGANIC synthesis research - Abstract
A new pyridine-acylamide ligand, L-L-N¹,N
4 -di(pyridin-3-yl)naphthalene-1,4-dicarboxamide, has been synthesized. Based on L, four types of carboxylate ligands as co-ligands and two metal ions (Zn(II) and Cd(II)), seven new metal-organic frameworks have been synthesized and structurally characterized. Compounds 1 and 2 are composed of SBU I (a helical {Zn (L)}n chain), while compounds 3-7 are composed of SBU II (a M2 L2 metallocycle). In 1, with Hbtc²- anions connected to the neighboring Zn(II) ions of one SBU I, an infinite 1D chain is formed, while in 2, the neighboring SBUs I are bridged by ip²- anions forming a 2D structure. With SBUs II extended by oba²- ligands, compound 3 shows a 2D network. Compound 4 exhibits a 1D infinite chain with SBUs II bridged by nap²- ligands. Compounds 5 and 6 are isomers in which SBUs II are extended by nap²- ligands to afford a 2D network. In compound 7, SBUs II are linked together by Hbtc²- ligands featuring an infinite 1D chain. All of these compounds have a 3D framework governed by hydrogen bond interactions. Comparing all the compounds, it can be seen that the structural characteristics of the L ligand and organic counteranions simultaneously play an important role in their construction. Moreover, their thermostability and photoluminescence properties were explored. [ABSTRACT FROM AUTHOR]- Published
- 2014
- Full Text
- View/download PDF