Encapsulation of any of these cis-conformers into libraries of columnar supramolecular dendrimers eliminates the intramolecular electrocyclization and replaces
the helix–coil transition with an unprecedented helix–helix transition and a reversible transition from cis-transoidal to cis-cisoidal. When the repeat unit of the
dendronized polymer also contains a stereocenter, this reversible process can be
monitored by circular dichroism (CD) and visualized by different methods
[104–111]. This concept was used to elaborate molecular machines that were
interfaced for the first time with the real world to lift heavy objects [111].
Fig. 9 Scanning force microscopy images of individual cylindrical dendronized polymers (a),
globular dendronized polymers (b), and of libraries of cylindrical dendronized polymers before (c)
and after annealing (d), visualizing the formation of 2D ordered arrays. Reprinted with permission
from [90] and [65]. Copyright 1998 and 2000 American Chemical Society
From Synthetic Macromolecules to Biological-Like Complex Systems
187
the helix–coil transition with an unprecedented helix–helix transition and a reversible transition from cis-transoidal to cis-cisoidal. When the repeat unit of the
dendronized polymer also contains a stereocenter, this reversible process can be
monitored by circular dichroism (CD) and visualized by different methods
[104–111]. This concept was used to elaborate molecular machines that were
interfaced for the first time with the real world to lift heavy objects [111].
Fig. 9 Scanning force microscopy images of individual cylindrical dendronized polymers (a),
globular dendronized polymers (b), and of libraries of cylindrical dendronized polymers before (c)
and after annealing (d), visualizing the formation of 2D ordered arrays. Reprinted with permission
from [90] and [65]. Copyright 1998 and 2000 American Chemical Society
From Synthetic Macromolecules to Biological-Like Complex Systems
187