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In this paper, an experimental review of the isotherms of the metallotetraphenylporphyrin (M-TPP) molecules has been carried out in the air-water interface. The isotherms are a function of the M-TPP concentration in the organic solvent used (chloroform) before spreading on the aqueous subphase. For very low M-TPP concentrations (10 -5 M ) in this solvent, isotherms whose extrapolated areas...