Metal-Directed Formation of Molecular Helix, Cage, and Grid Using an Asymmetric Pyridine-Pyrazole Based Bis-Chelating Ligand and Properties

The present work reports the construction
and self-assembly studies
of molecular helix and polyhedral coordination cages using a pyridine-pyrazole
based asymmetric ligand. Employment of different metals has resulted
in different architectures ranging from a one-dimensional helical
polymer, [2 × 2] grid to a pentanuclear cage. For all the structures,
hydrogen bonding and π–π stacking were found to
be instrumental in bringing additional stability to the polymeric
networks. Furthermore, chirality and magnetic properties of cobalt
and copper complexes have also been investigated.