Journal of the American Chemical Society
Communication
Pau, M. Y. M.; Solomon, E. I.; Karlin, K. D. J. Biol. Inorg. Chem. 2009,
14, 1301.
(17) Cramer, C. J.; Tolman, W. B.; Theopold, K. H.; Rheingold, A. L.
Notes
The authors declare no competing financial interest.
Proc. Natl. Acad. Sci. U.S.A. 2003, 100, 3635.
ACKNOWLEDGMENTS
(18) In terms of the nature of 2′·Cl2 in solution, the ESI-MS data for
the crystals were found to be identical to those for 2 generated in situ
in the reaction of 1 and O2. This result suggests that the chloride anion
instead of the aqua ligand coordinates to the Cr center in solution.
Support for this supposition was provided by an experiment in which
2.2 equiv of Ag(CF3SO3) was added to a solution of 2. ESI-MS
analysis revealed the dominant ion present to be [CrIV(12-TMC)(O2)
(Cl)]+, indicating that one chloride remained bound to the chromium
ion and that Ag+ removed only the Cl− counteranion. The aqua ligand
undoubtedly originates from residual solvent water and coordinates to
the Cr center only in the crystal structure, probably as a result of
preferred crystal packing.
(19) For a recent review of the literature on a variety of chromium−
peroxo complex structures, most also possessing oxo ligands, see:
Sergienko, V. S. Crystallogr. Rep. 2007, 52, 639.
(20) (a) Hempel, J. C.; Morgan, L. O.; Lewis, W. B. Inorg. Chem.
1970, 9, 2064. (b) Ueki, S.; Yamauchi, J. Inorg. Chim. Acta 2002, 338,
13.
■
The authors gratefully acknowledge support of this work by the
NRF of Korea through CRI and GRL (2010-00353 to W.N.),
the Ministry of Education, Culture, Sports, Science and
Technology of Japan through the Global COE Program and
Priority Area (22018026 to T.O.), and the U.S. National
Institutes of Health (to K.D.K.).
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