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topology; it is hard to imagine a crystal any more jam-packed with mechanical
bonds. The cartoon of the MOF in Fig.
15d
testifies to the importance of the
transition to cartoons.
3.4 The Transition to Cartoons
It will be recalled from Sect.
3.1
that first-generation MIMs were primarily
represented by primitive line drawings and condensed structural formulas.
Although Sauvage took a refreshing step forward into structural diagrams, there
was still a need to find a compromise between the simple line drawings that convey
only topology and the detailed structural diagrams that detail every atom and bond.
Again Sauvage was among the first to pioneer the next evolutionary step: graphical
representations, or cartoons. His 1985 report of a [3]catenand [
101
] included a
graphically simplified reaction scheme with attractive shading (Fig.
16a
). Few, if
Fig. 16 Early examples of MIM cartoons. (a) Sauvage's cartoon of a [3]catenand [
101
].
(b) Synthetic scheme of a donor-acceptor [2]catenane that uses illustration to emphasize topology,
noncovalent bonding, and electronic properties [
102
]. Reproduced with permission from [
101
]
(copyright 1985 American Chemical Society), [
102
] (copyright 1991 Wiley-VCH)
