Rod Packings and Metal−Organic Frameworks Constructed\nfrom Rod-Shaped Secondary Building Units

The principal structure possibilities for packing infinite rod-shaped building blocks are described.\nSome basic nets derived from linking simple rods (helices and ladders) are then enumerated. We\ndemonstrate the usefulness of the concept of rod secondary building units in the design and synthesis of\nmetal−organic frameworks (MOFs). Accordingly, we present the preparation, characterization, and crystal\nstructures of 14 new MOFs (named MOF-69A−C and MOF-70−80) of 12 different structure types, belonging\nto rod packing motifs, and show how their structures are related to basic nets. The MOFs reported herein\nare of polytopic carboxylates and contain one of Zn, Pb, Co, Cd, Mn, or Tb. The inclusion properties of the\nmost open members are presented as evidence that MOF structures with rod building blocks can indeed\nbe designed to have permanent porosity and rigid architectures.