Doublet photon structure

Nitrogen-to-iron weight ratios of 0.71 and 0.88 in 6 and 8, respectively, established the 71% and 88% oxidation ratios. The near-IR spectra of 12 and 13 had a broad absorption at 1000-2000 nm with maximum intensity at 1400-1700 nm. This band in BFD" (TCNQ)2 had previously been assigned to a photon-assisted intramolecular intervalence exchange (8, 9) and it confirmed that monooxidation of BFD units to [Fe(II)Fe(III)] occurred (BFD was dioxidized to its [Fe(III)Fe(III)] salts by Mueller-Westerhoff and Eilbracht (19) these salts had no absorption at 1400-1700 nm). Absorption at 600 nm was also pronounced. The Mossbauer spectrum of 12 was dominated by a single symmetrical absorption with a quadrupole splitting of 1.73 mm/sec which further confirms the BFD structure. Neutral BFD s doublet (2.40 mm/sec) was also observed. 

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