Hydrogen tunneling in the activation of dioxygen by a tris(pyrazolyl

Jul 1, 1994 - Hao Lei , Bobby D. Ellis , Chengbao Ni , Fernande Grandjean , Gary J. ... Jeffrey C. Yoder, Justine P. Roth, Emily M. Gussenhoven, Anna ...
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/. Am. Chem. Soc. 1994, 116, 6979-Í980

Hydrogen Tunneling in the Activation of Dioxygen by Tris(pyrazolyI)borate Cobalt Complex

Scheme

a

6979

1

o,

Mg, N2 T|>“CoI 1

-

Tp-Co-N2-CoTp"

-

2

Tp"Co 1.3 kcal/mol), (4) difference in the preexponential factors (/4-factors) resulting from an Arrhenius analysis (An/Ad < 0.6; in the Eyring analysis this appears as a difference in AS*). Figure 1 shows a comparative Eyring plot for the decompositions of 7 and 7-