We show that interference-induced flat bands (IFBs) are commonplace in reticular materials. For example, several metal-organic frameworks, including the superconductor Cu-BHT, form kagome lattices with metals at the vertices and ligands along the bonds. Similar bipartite motifs are common in reticular materials. A tight-binding model on this lattice yields partially occupied IFBs at half filling with large gaps between them and all other bands. Long-range hopping induces curvature in the bands but leaves them flatter and more isolated than those in twisted bilayer graphene. The slave boson theory of the $t-J$ model on this lattice shows unconventional superconductivity. Thus, crystal engineering of reticular materials provides a lattice-driven route to flat bands with high electronic densities, which promote exotic, strongly correlated phenomena.

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• Exotic phases of matter
• Flat bands
• Superconductivity
• Strongly correlated systems
• Lattice models in condensed matter
• Tight-binding model