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Overview
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TPPS is a water-soluble porphyrin that is reddish-purple in aqueous solution at pH 6.5 (maximum wavelength: 413 nm, molar absorptivity: 5.1x105) and green at pH 4 (maximum wavelength: 434 nm, molar absorptivity: 5.0x105). Its proton dissociation constants are reported to be pKa1=4.86 and pKa2=4.96. TPPS selectively forms a complex with Cu2+ in acidic conditions, and with Cd, Cu, Fe, Pb, and Pd in alkaline conditions.
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