(part of Steps Toward Molecular Manufacturing)
- almost no skeleton:
If neither compact cages nor larger cages
are very convenient solutions, what is one supposed to do ? At the
moment, it looks like link-chemistries using Diels-Alder type addition
reactions might provide a solution if the adduct structure, which does
provide additional functionalization sites beyond what is necessary
for link-formation, is used in part for structural stabilization of
the lattice. This then starts blurring considerably the convenient
separation of the design issues into the sub-problems of
link-chemistries and skeletons. It leads to custom-tailoring of the
skeleton structure to incorporate the Diels-Alder components, which
are of comparable size.
An interesting and helpful structural unit in the
design of such "integrated" MBBs can be found in using
spiro-connections, i. e. two rings sharing exactly one carbon-atom. By
using these, one is able to obtain a rigid 90 degree orientation of
two planar structures in the smallest possible volume.
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last updated Oct. 5 1996
e-mail: kr@n-a-n-o.com
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