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Radical Difussion in Glass Forming and Crystallizing Liquids

Diffusion is a random translational motion of molecules and its rate is described by the diffusion coefficient – diffusivity, which is studied by EPR spectroscopy. The diffusion of radicals in a liquid changes the strength of the magnetic interactions between the spins of their unpaired electrons and thus affects the shape of the EPR spectrum of the radicals [1]. By cooling liquids, two different phenomena can occur: crystallization, which is transition from a liquid to a solid state of a high degree of organization [3], and glass transition, which occurs by rapid cooling, formation of a solid amorphous state [2]. We examined the relationship between Tempone diffusivity and self-diffusion coefficients for PC and DMF. These relationships differ (Figure 1) which is possibly due to different cooling behavior and solid structure formation. [1] D. Merunka, M. Perić, J. Mol. Liq. 277 (2019) 886-894 [2] N. V. Surovtsev, Chem. Phys. Lett, 477 (2009) 57-59 [3] A. Baudot, P. Boutron, Cryobiology, 37 (1998) 187-199

electron paramagnetic resonance ; glass-forming liquids ; diffusion

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