The translational diffusion constant, D, has been measured for O-2 in the even 1-alkenes I-C6H12 to I-C16H32 and biphenyl in n-C6F14 and n-C9F20. Deviations from the Stokes-Einstein relation were found; the use of D/ T = A/eta(p) gave p = 0.560 +/- 0.017 for O-2 in the I-alkenes, the same (within experimental error) as found previously for O-2 in the nalkanes. The charge transfer (CT) transition used to detect O-2 in the I-alkenes is at 220 nm. The D values for biphenyl in the perfluoro-n-alkanes (PFAs) are consistent with those in the n-alkanes, where p = 0.718 +/-0.004. These results suggest that O-2 has similar solute-solvent interactions in both the I-alkenes and n-alkanes as does biphenyl in the n-alkanes and PFAs. (C) 2002 Elsevier Science B.V. All rights reserved.