4. Conclusions
We presented here a new semirigid bridging exobidentate ligands
with terminal thenylsalicylamide groups, which resulted in
the formation of 1D annular lanthanide coordination polymers
with interesting supramolecular structures. It is interesting to note
that the two salicylamide arms of L are somewhat flexible and
rotational around the 1,4-dimethoxybenzene to provide LnIII a
distorted biscapped square antiprismatic coordination geometry.
In addition, the two-dimensional puckered supramolecular architectures
formed by the weak CHO hydrogen bonds as well as
p–p stacking interaction between the chains have a cooperative
effect and participate in the stabilization of the architectures.
Luminescence studies demonstrated that the semirigid bridging
exobidentate ligands exhibits a good antenna effect with respect
to the TbIII ion than that of EuIII. It is worth noting that the change
of backbone groups is also a decisive factor in determining the
coordination environments of the metal centers as well as luminescence
properties. The results demonstrated herein serve to
illustrate the potential of salicylamide ligands both with regard
to constructing interesting supramolecular structures and for purposes
of incorporating predictable physical properties.
A