Binodal three-connected nets

This example (and also the following nod net) also illustrates the problem of controlling the synthesised network. While hexamethylenetetramine could be expected to be a four-connected node, and silver([) to act simply as a connector to give diamond like nets, the actual outcome may be different and controlled by more subtle intennolecular forces. Thus, using only slightly difierenl conditions the same group also obtained an srs net with the same reagents and solvents [33]. 

Some trinodal nets have also been observed. As was briefly noted in Chapter 4 it is very difficult to search for nets in the literature for a variety of reasons, thus, no doubt, there are other nets of this type to be uncovered even though the two systematic studies published so far seem to be fairly comprehensive [24,36J. 

Seven member rings are uncommon but we encounter them in the noc net. This net has vertex symbols 7 7g 7g, and 7-12rl23 with genus 5. 

Net Other names Vertex Symb. Short symb. Genus Node  

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Figure 3.15 Three dimensional representation of the two nets formed by the nodes in Figure 3.13. To the left we have a diamond net dia, slightly squashed in one dimension, representing the connectivity of the molecular building blocks. To the right we get a binodal three- and four-connected net called jph (see chapter 8) that corresponds better to the arrangement of atoms in the structure (see also Figure 3.14).

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