Band magnesium compounds

Pertinent to this discussion are recent studies on porphyrin- r-oation radicals derived from magnesium and cobaltic octaethyl porphyrins (171, 172), and zinc and magnesium tetraphenyl porphyrins (J71). In all cases, the optical spectra of such radicals share features also found in Compound I (Fig. 7). These are (a) a decrease of w-w transitions associated with the Soret band and (b) the appearance of bands between 600 and 700 nm. The chief objection to the proposal implicating a free radical moiety stems from the absence of a distinct EPR signature for Compound... 

Chlorophyll a with a Q -band at Amax = 665nm (95) is the magnesium complex of the dihydroporphyrin derivative 3 already shown in Fig. 3. The chemically quite different structures of compounds 7 and 8 are given in Fig. 9. 

The compounds a-4-dimethylbenzyl camphorate diethanolamine, magnesium bis (4-methoxy-y-oxo-l-naphthalenebutyrate), and 5-(p-methoxyphenyl)-l,2-dithiol-3(3H)-thione, which were supposed to be cholaneretics, did not increase the secretion of natural bile. The infrared spectra indicated that the constituion of the bile components was different after administration of each of these choleretics. The common feature of each was the near disappearance of bands of sodium taurocholate (mentioned earlier). No change in the absorption of lecithin (1738 cm ) was caused by a-4-dimethylbenzyl camphorate diethanolamine, but this band disappeared in the bile after administration of the magnesium and thione compounds above. Some bands not observed in natural bile appeared instead, notably near 1420 and 800cm, ... 

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