Study of the stability of 5,10,15,20-tetraphenylporphine (TPP) and metalloporphyrins NiTPP, CoTPP, CuTPP, and ZnTPP by differential scanning calorimetry and thermogravimetry Gamboa, M.; Campos, M.; Torres, L.A.; The Journal of Chemical Thermodynamics 2010, 42, 666-674