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4.Conclusion
The first examples of lanthanide coordination polymers
with bpdc and phen were self-assembled by hydrothermal
method.The bpdc ligands in these polymers adopt tetrad-
entate coordination modes in two bridging bidentate car-
boxylate groups.Coordination polymers 1¨C4 are
isostructural,and 1-D zigzag chains are composed of
Ln2(bpdc)3(phen)2(H2O)2 building blocks.The bond
lengths of Ln¨CO,Ln¨CN and Ln Ln separations show a
lanthanide contraction over the series.The thermal stabil-
ity of the frameworks can be attributed to the high coordi-
nation number of lanthanide ions,the strong metal¨C
carboxylate bonds and p¨Cp interactions.Photolumines-
cence properties indicate that compound 2 and compound
4 emit characteristic fluorescence,respectively.
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