SPECTROSCOPIC CHARACTERISTIC OF LA(III) CHLOROPHYLL

Lanthanum(III) chlorophyll-a [La(III)-chl-a] was synthesized from pheo phytin-a (pheo-a) and lanthanum(III) chloride-sevenhydrate (LaCl3.7H(2 )O) in the present wort. Its characteristics have been investigated by ultraviolet-visible (UV-Vis), magnetic circular dichroism (MCD) and F T-IR spectre. The spectra of Cu(II), Zn (II), Mg(II), and free metal c hlorophylls were presented for purpose of comparison. These results de monstrate that porphyrin ring of pheo-a is coordinated to La(III) ion successfully. The composition of La(III)-chl-a, which is formulated as [La(III) (chlorophyll) (CH3COO)(-1)(H2O)], has been confirmed by elem ental analysis, UV-Vis, MCD and FT-IR spectre. In addition, La(III)-ch l-a may have the structure similar to that of monoporphyrin chi-a and Zn( II)chi-a, which was shown from their similar MCD spectra.