Journal
CRYSTENGCOMM
Volume 11, Issue 11, Pages 2516-2522Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b904671b
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Funding
- NSF of China [20701025]
- NSF of Shandong Province [Y2008B01]
- Shandong University
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Three flexible dicarboxylate ligands 2,2'-(1,2-phenylenebis(methylene))bis(sulfanediyl)dibenzoic acid (H2L6), 2,2'-(2,4,6-trimethyl-1,3-phenylene)bis(methylene)bis(oxy)dibenzoic acid (H2L7) and 2,2'-(1,4-phenylenebis(methylene))bis-(sulfanediyl)dinicotinic acid (H2L8), have been designed and synthesized. All ligands can adopt syn or anti conformations and the positions of the functional substituents in the central benzene ring change gradually from 1,2-, 1,3- to 1,4-position. By applying these flexible ligands to assemble with copper ions, four metal-organic complexes based on paddlewheel SBU have been isolated. Complexes 1 and 2 are discrete molecular chairs. Complex 3 is a 1D molecular-chair-based coordination polymer. The molecular chairs, similar to that found in 1 and 2, are infinitely connected by the bridging 4,4'-bipy ligands to result in the formation of the 1D chain structure. Complex 4 is a two-dimensional wavelike layer structure containing a 68-member ring. Both L-6 and L-7 in 1 and 2 adopt syn conformation, while L-8 adopts anti conformation, which results in the formation of the 2D layer structure of complex 4.
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