Selection for a Single Self-Assembled Macrocycle from a Hybrid Metal–Ligand Hydrogen-Bonded (MLHB) Ligand Subunit

To
expand the interface between self-assembled metal–ligand and
hydrogen-bonded architectures, here we report the preparation, self-assembly,
and metal–ligand binding of a pyridyl quinolone ligand (5-PYQ).
The 5-PYQ ligand self-associates through quinolone hydrogen bonding,
and it binds to metal centers through the pyridine ligand component.
As a first step toward investigating more-complex hybrid metal–ligand
hydrogen-bonded (MLHB) architectures, we report investigations of
5-PYQ with mono- and bis-platinated
anthracene precursors. These results demonstrate that the 5-PYQ ligand
maintains hydrogen bonding interactions while binding to square-planar
platinum centers, but that generation of coordination compounds with
closed topology erodes the hydrogen bonding fidelity to favor ambidentate
coordination modes of the 5-PYQ ligand.