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Conclusions
We have presented here two novel structurally-related flexible exo-
bidentate ligands, with different backbone chain lengths, which
result in the formation of lanthanide complexes with diverse
structures. X-ray crystallography revealed that the polymers have
novel 2D herringbone frameworks (1–2) and 2D honeycomb
frameworks (3–6) as well as two different types of 1D ladder-
like structures (7–9, 10–12). The structural diversity is mainly
caused by the variation in the flexibility of ligands and the
lanthanide contraction effect. It is obvious that varying the chain
length of the backbone from triethylene glycol to diethylene
glycol affects the flexibility of ligands, which considerably changes
the overall frameworks from two-dimensional topology nets to
one-dimensional ladder-like structures. The resulting polymers
provide the lanthanide ions with a nona-coordination environ-
ment and prevent solvent and water molecules from entering
the coordination sphere, effectively resulting in an enhanced
sensitization of the lanthanide due to a decrease in the vibronic
quenching effect. The photophysical properties of the lanthanide
complexes also demonstrate that the two salicylamide based
ligands exhibit a good antenna effect for Ln3+ cations and
provide excellent sensitization of the Tb3+ luminescence through
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a
particularly efficient ligand-to-lanthanide energy transfer
process.
Acknowledgements
This work was financially supported by the National Natural Sci-
ence Foundation of China (Grants 20771048, 20931003, 21001059
and J0730425) and the Fundamental Research Funds for the
Central Universities (lzujbky-2009-k06).
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