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An Unusual (3,11)-Connected Network Constructed by Tri-nuclear Lanthanide Building Units and Mixed Ligands
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DOI：10.14102/j.cnki.0254-5861.2011-2381.png)
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Abstract
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Under hydrothermal conditions, a new lanthanide coordination polymer, [Er-3(oba)(4)(na)](n) (1, oba = 4,4'-oxybis(benzoate), na = nicotinic acid) has been synthesized. Compound 1 shows a 3D framework by incorporating tri-nuclear [Er-3(COO)(6)] unit and the mixed ligands of oba(2-) and na. It is interesting that decarboxylation occurred in the ortho position and 2,3-pyridinedicarboxylic acid was partially transformed into na under hydrothermal conditions. Compound 1 can be reduced into a (3,11)-connected net and displays weak second-harmonic generation response. Furthermore, the PXRD, TGA and IR spectra were also studied.
Keywords:
lanthanide
coordination polymer
mixed ligands
second-harmonic generation
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