Construction of Bis-pyrazole Based Co(II) Metal–Organic Frameworks and Exploration of Their Chirality and Magnetic Properties

In continuation of our interest in
pyrazole based multifunctional
metal–organic frameworks (MOFs), we report herein the construction
of a series of Co­(II) MOFs using a bis-pyrazole ligand and various
benzene polycarboxylic acids. Employment of different acids has resulted
in different architectures ranging from a two-dimensional grid network,
porous nanochannels with interesting double helical features such
as supramolecular chicken wire, to three-dimensional diamondoid networks.
One of the distinguishing features of the network is their larger
dimensions which can be directly linked to a relatively larger size
of the ligand molecule. Conformational flexibility of the ligand also
plays a decisive role in determining both the dimensionality and topology
of the final structure. Furthermore, chirality associated with helical
networks and magnetic properties of two MOFs have also been investigated.