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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on either the cubic diamond lattice or the hexagonal Lonsdaleite lattice in which each C-C bond of the prototype had been replaced by a molecular rod.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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