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We propose that a new and potentially extensive class of solid
polymeric materials with unprecedented and possibly useful
properties may be afforded by linking together centers with either
a tetrahedral or an octahedral array of valencies by rod-like
connecting units. For example, if ways could be devised of linking
together tetrahedral centers and appropriate molecular rods, an
infinite molecule would be generated which might be expected
to adopt a structure based on either the cubic diamond lattice or
the hexagonal Lonsdaleite lattice in which each C-C bond of the
prototype had been replaced by a molecular rod. These frameworks
would generate a regular array of cavities, interconnected
by windows. When models of 3D networks based on tetrahedral
centers are constructed, a very striking feature is the relatively
large size of the cavities and windows produced even by rods of
only modest length.
Lattices of this general type seemed to us to offer a number
of features of sufficient potential interest and utility to warrant
attempting the synthesis of some exploratory examples. For
instance, they may show interesting molecular sieve and ion exchange
properties, they may have unusual mechanical and elec-trical properties, and they may, after appropriate functionalization
of the rods, provide tailor-made materials for the heterogeneous
catalysis of a wide range of transformations.

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