Tecto, defined

More recently, mathematically defined, structure controlled, covalent megamers have been reported. They are a major subclass of megamers also referred to as core-shell tecto dendrimers) [126-128], Synthetic methodologies to these new architectures have been reported to produce precise megameric structures that adhere to mathematically defined bonding rules [91, 129], It appears that structure controlled complexity beyond dendrimers is now possible. The demonstrated structure control within the dendrimer modules, and now the ability to mathematically predict and synthesize precise assemblies of these modules, provide a broad concept for the systematic construction of nanostructures with dimensions that could span the entire nanoscale region (Figure 1.24). 

Fig. 31 (a) Symmetry properties of core-shell tecto(dendrimer) structures when ri/r2 < 1.20. (b) Sterically induced stoichiometry (SIS) defined shell capacities (A max). based on the respective core and shell radii, when ri/j-2 < 1.20. (c) Mansfield-Tomalia-Rakesh equatirai for calculating the maximum shell-filling value (capacity) (A/max)> when rjr2 > 1.20 [121, 138, 167]... 

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