Among the recent developments in
metal-organic frameworks (MOFs),
porous layered coordination polymers (CPs) have garnered attention
due to their modular nature and tunable structures. These factors
enable a number of properties and applications, including gas and
guest sorption, storage and separation of gases and small molecules,
catalysis, luminescence, sensing, magnetism, and energy storage and
conversion. Among MOFs, two-dimensional (2D) compounds are also known
as 2D CPs or 2D MOFs. Since the discovery of graphene in 2004, 2D
materials have also been widely studied. Several 2D MOFs are suitable
for exfoliation as ultrathin nanosheets similar to graphene and other
2D materials, making these layered structures useful and unique for
various technological applications. Furthermore, these layered structures
have fascinating topological networks and entanglements. This review
provides an overview of different aspects of 2D MOF layered architectures
such as topology, interpenetration, structural transformations, properties,
and applications.