prov:value
| - When a metal or metal composition such as Fe, Co, Ni, Mn, Fe/Co, Fe/Ni, Ni/Co, Fe/Pt, Fe/Cd, Fe/Pb, or Fe/Co/Ni is employed as the center metal represented by M for the tetraazaporphyrin derivative or alkali-metal-doped porphyrin derivative, and potassium is employed as the alkali metal for the doping, the obtained alkali-metal-doped tetraazaporphyrin derivative and alkali-metal-doped porphyrin de
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