1. Scorpion-shaped carboxylate ligand tailored molecular square, bilayer, selfthreading and (3,6)-connected nets.
- Author
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Xin-Yi Cao, Jian Zhang, Zhao-Ji Li, Jian-Kai Chenga, and Yuan-Gen Yao
- Subjects
CARBOXYLATES ,LIGANDS (Chemistry) ,PHTHALIC acid ,METAL-organic frameworks ,PHOTOLUMINESCENCE - Abstract
A novel designed scorpion-shaped 5-oxyacetateisophthalic acid (H
3 OABDC) was used to construct a series of luminescent metal--organic frameworks, namely [Zn2 (HOABDC)2 (phen)2 (H2 O)2 ]n ·nH2 O (1), [Zn2 (OABDC)(4,4′ -bipy)(µ2 -OH)(H2 O)]n ·4/3nH2 O (2), [Cd3 (OABDC)2 (4,4′ -bipy)4 (H2 O)4 ]n ·2nH2 O (3), [Cd2 (OABDC)(phen)2 (µ3 -OH)]n ·1/3nH2 O (4), and [Zn8 (OABDC)4 (2,2'-bipy)4 (µ2 -OH)4 ]n ·2nH2 O (5) (bipy = bipyridine, phen = 1,10- phenanthroline). Complex 1 features a discrete molecular square and π--π and C--H···π interactions between molecular squares give rise to a 2D sheet. Complex 2 shows an unusual 2D bilayer architecture with (3,5)-connected topology. A prominent structural feature in 3 is the selfthreading 2D layered structure. Both 4 and 5 exhibit (3,6)-connected topology. In 4, an extraordinary folded four-step-ladder Cd4 (OH)2 unit acts as 6-connected node and the framework is 2D (3,6)-connected net. While in 5, the Zn2 (OH) unit adopts octahedral geometry and the whole framework features a 3D (3,6)-connected rutile (rtl) topology. Photoluminescence studies revealed that these complexes are interesting blue, green and orange luminescent materials. The thermal stabilities of these complexes are also discussed. [ABSTRACT FROM AUTHOR]- Published
- 2007
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