Chiralization of Diamond Nets: Stretchable Helices and Chiral and Achiral Nets with Nearly Identical Unit Cells

Stretchable diamond nets: Homochiral and achiral diamond nets with nearly identical unit cells have been found in a family of 3D framework materials containing flexible helical substructures (see picture; Cd green, O red, C gray). Such structures raise intriguing prospects for developing general strategies for the direct conversion of achiral four-connected networks into homochiral networks through ligand substitution.