A new compound, 2-carboxylbenzaldehyde-2-pyrroleformylhydrazone (C13H11N3O3), was synthesized by condensation of 2-carboxylbenzaldehyde (C8H6O3) with 2-pyrroleformylhydrazine (C5H7N3O). Its structure has been determined on the basis of elemental analysis, FTIR spectrum, UV-vis spectrum,1HNMR,13CNMR, MS and X-ray single-crystal diffraction analysis.

Thirteen novel complexeswere synthesized using this method, by employing the designed ligand o-carboxylbenzaldehyde-2-pyrroleformylhydrazone (H2L). Elemental analysis, molar conductivity,Fourier transform infrared (FTIR) spectracharacterizations show that the composition formula of the complexes is RE(HL)(H2L)•2H2O (where RE=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb and Y). The thermal decomposition of the thirteen complexes was studied by Subscript textTG-DTG analysis and their apparent activation energies (E) were calculated by Kissinger’s and Flynn-Wall-Ozawa’s methods.