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Schematic of possible mechanisms of crosslink migration in 3•PVP networks in DMSO. (a) Direct displacement of one pyridine side chain by another. (b) Solvent-assisted exchange of pyridine side chains. Experiments support that the solvent-assisted mechanism is operative. Sol represents the DMSO solvent. Positive charges and counter ions are not shown. Reproduced with permission from J. Am. Chem. Soc. 2005, 127, 14488. Copyright 2005 American Chemical Society.
