Abstract
The m.c.d. spectra of alkyl-substituted porphyrin dianions show a positive A term for the Q0–0 band and unresolved A-terms in the Q0–1 band. A major difference with respect to the corresponding dications is the lower intensity of a negative A term for one vibronic component of the Q0–1 band in the dianions. Magnetic moments of 2·3–3·1 Bohr magnetons were obtained by curve fitting for the Q0–0 band. Moment analysis for the entire Q band gave smaller values of 0·6–1·5 Bohr magnetons. This discrepancy is interpreted to be a consequence of the weakly allowed character of the transition. The corresponding porphyrin dications were found to have smaller magnetic moments. Identification of the Q0–0 band in the m.c.d. spectrum of porphin dianion is difficult, because of its low intensity.
Published Version
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