Liquid-liquid extraction investigations of Pd(II), V(V), Co(III), Cu(II), Ni(II) and Fe(II)-PAR[4-(2-pyridyl azo)-resorcinol]\complexes by using dicyclohexano-18-crown-6- have been carried out. Anioic complexes of Pd(II), V(V), Co(III), Cu(II), Ni(II) and Fe(III)-PAR extracted into organic phase as increase in order Pd> V> Co> Cu> Ni> Fe. During thermodynamic studies, it was observed that the entropy effect is one of the important factors responsible for the selective extraction. However, the shape of the complexes may be one of the causes for the selective change in entropy during the extraction of chelate. In effect, planar palladium-PAR-SCN- chelate was extracted selectively in comparison with other chelates.