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J. Am. Chem. Soc. 1987, 109, 7873-7875 7873 -Mnrrl-I -Mnrrr-
 

Summary: J. Am. Chem. Soc. 1987, 109, 7873-7875 7873
Chart 111
0-OH 0-OH
I -Mnrrr-I
-Mn"'-I
HO-OH
-Mnrrl-I -Mnrrr-
IOH
IHOH
IOH
Ia (krate= 87.6) I b II (k,,t,= 5.38x 10")
0-OH
I(OH )2
111 (krate= 6.94 lo5)
idizes ABTS in preference to H202. The manganese(II1) of
structure Ia should be of high spin, and HOO- need only compete
with water for ligation. At the intermediate pH of 10.2, HOO-
is oxidized only two times faster than is ABTS. At this pH, HOO-
need only compete with water for ligation; however, comparison
of structures Ia and I1 suggests that the manganese moiety of the

  

Source: Apeloig, Yitzhak - Department of Chemistry, Technion, Israel Institute of Technology

 

Collections: Chemistry