Preparation and applications of some complexes derived from lanthanon(III) ions with some ligands derived from pyrazole

Adel S Orabi


The novel complexes derived from some pyrazole derivatives ligands: 2,4-dihydroxybenzylidene-3`-imino-5`-methylpyrazole(L1); salicylidene-3`-imino-5`-methylpyrazole(L2); 2-hydroxynaphthylidene-3`-imino-5`-methylpyrazole(L3) and LaCl3, Ce(NO3)3 and Nd(NO3)3 were prepared and characterized using elemental analysis (C, H,  N, M%), mass, FT-IR spectroscopy, electrical conductivity and thermal gravimetric analysis (DTA/TG). The electrical conductivity of 0.001M in DMSO revealed the electrolytic behavior of the all formed complexes as 1:1 (coordination sphere cation : ionization sphere ions) electrolyte for complexes derived from L1 and L2 ligands meanwhile L3 gave 1:2 electrolyte. The thermal analysis (DTA/TG) of the synthesized complexes revealed the presence of two types of water molecules as water of crystallization and coordinated one which act as a ligand. The complexes formed could be formulated as [M(L)2.nH2O].Z.mH2O for L = L1 and L2, [M(L).nH2O].2Z.mH2O for L = L3 (Z = Cl- for M = La(III) and Z = NO3- for M = Ce(III) and Nd(III)). Nd(III)-L3 complexe exhibit promising catalytic activity towards the aerobic oxidation of p-phenylenediamine (PPD) to the corresponding semi-oxidized form (PPD+). The antimicrobial activity of the complexes under investigations was tested and discussed. The simulated molecular structure and the energy of the formed complexes were performed using chem.-office package program. The relation between the spatial arrangement of the formed complexes and its antimicrobial activity was evaluated.


Lanthanon(III) solid complexes; catalytic activity; antibacterial properties; thermal and conductivity properties; simulated molecular structure

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