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Synthesis, Structure, and Evaluation of the Effect of Multiple Stacking on the Electron-Donor Properties of π-Stacked Polyfluorenes

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posted on 28.06.2003, 00:00 by Rajendra Rathore, Sameh H. Abdelwahed, Ilia A. Guzei
A versatile synthesis of π-stacked polyfluorenes is described. These polyfluorenes retain their cofacial conformations both in solution and in the solid state as was judged by NMR spectroscopy and X-ray crystallography. The experimental electron-detachment energies of F1F4 showed linear correlations with the quantity 1/n, where n is the number of fluorene moieties. These correlations allowed the estimation of the vertical ionization potential (IP) of 7.10 eV and the oxidation potential (Eox) of 0.97 V versus SCE for the multiply stacked polyfluorene donor with an infinite number of fluorene moieties. These observations with π-stacked polyfluorenes may prove to be highly relevant to the electron-transport phenomenon observed in DNA through π-stacked bases.