Further characterization of 3D nets

For the second 4-connected net (6, 4), the NbO net, y = 4. The values of x and are not of interest from the chemical standpoint, but it is recommended in MSIC that they be determined, if only to ensure that the models are examined carefully and not merely assembled and dismantled. 

The basic systems of connected points, polyhedra, plane, and 3D nets are summarized in Table 3.7, which shows that the four plane and four 3D nets form series with n = 6, 5, 4, and 3, and with n = 10, 8, 6, and 4 respectively. All systems on the same horizontal line are composed of n-gon circuits, and all those in a 

Relation between polyhedra, plane, and 3-dimensional nets 

The fifth regular solid, the icosahedron, and other 5-connected systems are omitted from Table 3.7 because there are no 5-connected plane or 3D nets composed of polygons of one kind only. For coordination numbers greater than six only 3D nets are possible. Two aspects of 3D nets which are important in structural chemistry should be mentioned here they will be discussed in more detail later. 

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