Tumbling correlation times, τ, of tempo or tempone in several solvents as a function of temperature: (◇) tempo in 3-methylpentane, (△) tempone in 1-propanol, (□) tempone in decalin, (•) tempone-d16 in 1:1 water:glycerol, (▲) tempone in glycerol. The solid lines show the tumbling times calculated from the literature values of solvent viscosity using the Stokes-Einstein equation with temperature-independent slip coefficients (see text for details).