Organic Free Radicals as Circularly Polarized Luminescence Emitters
Mayorga Burrezo, P. , Jiménez, V. G., Blasi, D. , Ratera, I. , Campaña, A. G. and Veciana, J. (2019), Angew. Chem. Int. Ed.
In the last years chirality and, more specifically, its influence on the luminescent properties, has attracted great attention. In this context, circularly polarized luminescence (CPL) has emerged as a powerful spectroscopic tool to explore the emissive excited states of chiral structures. Nowadays, despite inorganic CPL emitters are leading this technology, pure organic samples are considered as promising alternatives in several hot applications where toxicity factors are crucial (i.e., bioimaging). Encouraged by the interest that the use of magnetically active compounds has captured in optics and optoelectronics, herein we present the CPL activity of two pure organic triphenylmethyl (trityl) radical-based chlorinated derivatives with propeller chirality. After the resolution of the racemic compounds, the CPL response was analysed and highly efficient chiral emission were obtained. As a results, this work represents a pioneering approach where luminescence from pure organic molecules with intrinsic chirality is combined with magnetic activity, taking advantage of all the benefits that the open-shell character may provide.
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