Based
on the predesigned single ligands with different
configurations,
two pillared Kagome-layer metal–organic frameworks (MOFs),
Cu(dcpy) and Cu2(pdda)2(H2O), have
been successfully fabricated by the ligand-to-axial approach. The
two MOFs present binodal (3,6)- and (3,5)-connected nets based on
Cu2 paddlewheel nodes, respectively. The different ligand
configurations lead to distinct architectures, in which the structure
of Cu(dcpy) can be described by an A-A-A parallel
fashion between the staggered Kagome layers, while the layers stack
in an A-B-A-B eclipsing fashion for the structure of Cu2(pdda)2(H2O). Such structural differences demonstrate
that the reduced connectivity of Cu2 units caused by the
coordination orientation of ligands can be achieved through the change
from a framework with no functionality to a functionalized framework.
Both MOFs possess high porosity characterized by N2 adsorption
and exhibit preferential binding of C3H8 than
C3H6 in low-pressure regions.
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