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. Author manuscript; available in PMC: 2015 Jul 10.
Published in final edited form as: Dalton Trans. 2013 Jul 19;42(36):13014–13025. doi: 10.1039/c3dt51277k

Figure 2.

Figure 2

Left: Electronic absorption spectra of a 7.5 mM acetonitrile solution of 1 (solid black line) treated with 1 equiv. KO2 at −40 °C in MeCN. The black dashed traces shows the conversion of 2 (green dashed trace) to 3 (solid green trace). Right: A) Perpendicular-mode X-band EPR spectrum of a 5 mM butyronitrile solution of 1 six hours after treatment with 1 equiv. KO2 at −40 °C (complex 3). Recording conditions: 5 K, 9.6374 GHz microwave frequency, 5.02 mW microwave power, 0.4 mT modulation amplitude, 100 kHz modulation frequency, 81.92 ms time constant, and 15 000 point resolution. B) Perpendicular-mode X-band EPR spectrum of a 0.54 mM frozen solution of recrystallized 3 in butyronitrile. Recording conditions: 20 K, 9.6386 GHz microwave frequency, 5.02 mW microwave power, 0.4 mT modulation amplitude, 100 kHz modulation frequency, 81.92 ms time constant, and 15 000 point resolution.