Electronic spectra formic acid

Mesohemin IX prepared by this method shows a single band on polyamide tic (benzene/methanol/formic acid, 110 15 1 and methanol/acetic acid 100 2)10 and on silica gel tic14 (benzene/methanol/formic add, 110 30 1). The electronic spectrum of the pyridine hemochrome, prepared by reducing the mesohemin (in pyridine) with an aqueous solution of sodium dithionite, contains the bands (4 N pyridine, 0.2 N KOH) Xmax 407.5, 516, 546.2 nm. e 139.5,20.9,35.8 (mAT1). 

Isoelectronic analogies are very helpful in understanding the geometry and electronic structure of the monovalent alkaline earth derivatives. For example, formamide, HC(0)NH2, differs from formic acid, HC(0)0H, by the substitution of an NH2 group for OH. The use of formamide as an oxidant in a Broida oven gives rise to a spectrum [93] with three electronic transitions A X, B-X, and C-X (Fig. 20) very similar to the corresponding monoformate derivatives. 

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