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TINY WORLD Molecules that can be switched between conducting and nonconducting states--such as the UCLA-synthesized [2]rotaxanes shown here--lie at the heart of some of today's lab demonstration circuits. In one state (right structure and upper right schematic), a cationic cyclophane ring (blue) encircles a tetrathiafulvalene (TTF) unit (green). Oxidizing the TTF unit causes electrostatic forces to drive the cyclophane ring to a dioxynaphthalene unit (red), switching the molecule to the other state (left). |
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Chemical & Engineering News |
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