Abstract
Manganese(III) chlorophyll-a [Mn(III)-chl-a] has been synthesized in almost pure form from pheophytin-a and manganese(II) acetate. A good separation of Mn(III)-chl-a has been achieved by reversed-phase high performance liquid chromatography. The chromatographic behavior, absorption spectra and elemental analyses have demonstrated that manganese(II) chlorophyll-a [Mn(II)-chl-a] and Mn(III)-chl-a are formulated as [Mn(II) (chlorophyll-a) ] and [Mn(III) (chlorophyll-a) (CH3COO)- (H2O)] respectivery. A comparison of visible absorption spectra has revealed that Mn(II)-chl-a has Soret and Q bands characteristic of metallochlorophylls of divalent transition metal ions. On the other hand, the absorption spectrum of Mn(III)-chl-a makes a great difference in shape and intensity. This consequence is interpreted on the basis of a strong metal-ligand mixing in Mn(III)-chl-a
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