Polychlorotriphenylmethyl Radicals: Towards Multifunctional Molecular Materials - Stable Radicals: Fundamentals and Applied Aspects of Odd-Electron Compounds - page 76

has been demonstrated that PTM open shell D-A systems can exist in three stable oxidation states exhibiting
different linear and nonlinear optical responses as well as distinct magnetic properties. The possibility to
use other external stimuli, such as light, has also been considered for switching of their functionalities.
The chemical flexibility of the PTM radicals demonstrates, too, the potential of preparing self-assembled
multifunctional molecular switching devices on surfaces.

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