Energy Transfer between Triplet States in a Viscous Medium

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Abstract
The mechanism of energy transfer between triplet states of aromatic molecules has been studied using deuterated phenanthrene as donor and deuterated naphthalene as acceptor. The investigation reveals that at high viscosities the transfer rate constant kt can be accounted for in terms of an electron exchange interaction and becomes diffusion controlled as the viscosity η is decreased and molecular motion becomes appreciable. The results covering viscosities above 104 P are in good agreement with a Debye diffusion‐controlled collision reaction, ktη=const. The interaction is probably electron exchange in nature with range Rc≈20 Å. The relative magnitudes of Rc and r̄ = 〈r2〉½ determine the characteristics of the energy‐transfer phenomenon.

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