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Nowadays there is a great interest in using individual molecules as nanometer-scale switches and logic devices, with the aim of reaching higher power and smaller size. Demonstrating that one molecular switch can be turned on and off at room temperature simply by applying a current to a neighboring molecule has interesting implications. Herein, we report the synthesis, characterization, and behavior of three generations of polyphosphorhydrazone dendrimers, fully functionalized with 6, 12, and 24 redox-active perchlorotriphenylmethyl (PTM) radicals in the periphery, capable of undergoing an electrochemical reversible switching by multielectron reduction and oxidation. An electrical input was used to trigger the physical properties of these radical dendrimers in a reversible way, modifying their optical, magnetic, and electronic properties. Our Gn(PTM•)x radical dendrimers are paramagnetic, exhibit an absorbance band at 386 nm, and have a red fluorescence emission, if in the radical state. When they are swit...

Redox-Active PTM Radical Dendrimers as Promising Multifunctional Molecular Switches