1993 Volume 9 Issue 1 Pages 47-51
Fluorine-19 nuclear spin relaxation rates for fluorocarbon solutions involving oxygen have been measured over a wide frequency range (10 to 235MHz) at 25°C. The19F relaxation of the solvents involving paramagnetic oxygen can be explained by Bipolar electron spin-nuclear spin interaction modulated by both translational diffusion (τd of 2.0×10-11 and 2.5×10-11s for C6F6and C6H4(CF3)2, respectively) and the lifetime of the short-lived complex (τh of 7.6×10-13 and 1.3×10-12s for C6F6 and C6H4 (CF3)2, respectively), although the translational contribution is dominant. The translational motions account for 81 and 70% of the relaxation process and are characterized in the present analysis by closest distances of 3.6 and 3.8A for C6F6 and C6H4(CF3)2, respectively.
