Chapter 8 - Nets with both three- and four-connected nodes

Abstract

The stoichiometry between the three- and four-connected nodes is the most important factor of these nets. It is possible to control the formation of these types of nets by choice of node ratios. A number of additional compounds with three- and four-connected nets have been found and a number of interpenetrating structures have also been listed. The deliberate “self assembly of triangles, squares, and tetrahedral” are also reported. The RCSR database currently includes some 30 different three- and four-connected nets. The four-connected nets can make a distinction between tetrahedral four-connected nodes and square planar nodes. One can divide these nets into those that have all three-connected nodes binding to three four-connected nodes and all four-connected nodes binding to four three-connected nodes and all other combinations. In the alternating nets, every three-connected node binds to three four-connected nodes that it shares with three other three-connected nodes, giving the stoichiometric ratio. The nets with three- and four-connected nodes with their name, vertex and short symbol, genus, and stoichiometery are summarized in this chapter.