Design and Synthesis of Enantiomerically Pure Chiral Sandwichlike Lamellar Structure: New Explorations from Molecular Building Blocks to Three-Dimensional Morphology

This article reports a pair of novel chiral sandwichlike
complexes
for the first time. In the two complexes, lanthanide Eu3+ ions and Na+ ions are sandwiched between Schiff base
ligands, resulting in a two-dimensional plane. For both of the complexes,
the intraplane and interplane interactions are utterly different.
The adjacent planes are held together by weak van der Waals forces,
while the single plane is formed by covalently bonded intraplane N–Eu–O,
O–Eu–O, and O–Na–O atoms. On the basis
of this characteristic information derived from their molecular building
blocks, we studied three-dimensional morphology which has good agreement
with expected lamellar morphology. Furthermore, to examine the chiroptical
and stable activities, the CD spectra were investigated in the solution
of methanol and five different solid forms.