Synthesis, thermoanalytical, spectroscopic study and pyrolysis of solid rare earth complexes (Eu, Gd, Tb and Dy) with p-aminobenzoic acid

摘要: Abstract Synthesis, thermoanalytical, spectroscopic study and pyrolysis of some solid-state rare earth complexes with p-aminobenzoic acid (Eu, Gd, Tb Dy) were performed. All the synthesized obtained as monohydrated state thermal decomposition in dynamic dry air atmosphere occurs two, three or four steps formation respective oxides, Tb4O7 Ln2O3 (Ln = Eu, Gd Dy). In nitrogen atmosphere, consecutive and/or overlapping mass loss are still being observed up to 1000 °C. The DSC curves show that all presented a reversible phase transition. EGA results permitted identify gaseous products released during oxidation complexes. provided information about vibrational electronic transitions Middle near infrared region modes ligand’s denticity these Moreover, spectra together ultraviolet visible (diffuse reflectance) regarding 4f-4f ions. arithmetic difference between diffuse reflectance solid europium(III) gadolinium(III) reveals presence ligand-to-metal (O2− → Eu3+) charge transfer (LMCT) 305–470 nm range.