New Complexes of Pr(III), Sm(III), Gd(lll), Gd(III), La(III) 1-(2-Benzthyazolyl)-3-methyl-4-azo-(4-nitrophenyl)-Pyrazolyn-5-one

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1-(2-Benzthyazolyl)-3-methyl-4-azo-(4-nitrophenyl)-Pyrazolyn-5-one (HL) possesses a chelating behavior. Its chelates with a number of trivalent lanthanide ions Pr(III), Sm(III),Gd(III), Ho(III), La(III) of the type Na3[Ln(L)2(OH)4] have been isolated and characterized on the basis of their elemental analyses, IR and visible spectra, magnetic and molar conductance studies, thermal and X-ray analysis and molecular weight determinations. All chelates have a monomeric octa-coordinated stn1cture and square antiprismatic (C2) symmetry.