| http://www.w3.org/ns/prov#value | - Metallized porphyrin compounds of TMPP and DME are respectively depicted in FIGS. 14 and 15, wherein M is any suitable metal ion, such as Ni2+, Co2+, or Fe3+, X is a suitable anion to render the compound neutral, such as ClO4 ??? in the case of TMPP and Cl??? in the case of DME, and n is an integer sufficient to render the compound neutral, such as 4 in the case of Ni2+ and Co2+ TMPP, 5 in the cas
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