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5,10,15,20-tetra(carboxyphenyl)porphyrin and its complexes were synthesized and characterized by the element analysis,conductivity,UV-Vis,IR,NMR,ESI-MS.Thermogravimetry(TG) and differential scanning calorimetry(DSC) for all compounds in an atmosphere of N2 were performed.The results showed the complexes have higher thermal stability than ligand.The Ni-TCPP complex has the highest thermal stability,and thermal stability of other complexes can be ranked as Ru-TCPP ≈ Pt-TCPP > Pd-TCPP > VO-TCPP > Zn-TCPP > Cu-TCPP from high to low.