Synthesis and Structural Characterization of Lanthanum(III) Complexes of 4-Nitrosoantipyrine

Meera Gopal and Sreesha Sasi*,

Department of Chemistry, Maharaja’s College, Ernakulam-682011, India

*Corresponding author: E-mail:;


A new series of La(III) complexes of the ligand with the general formula [La(L)2(a)3] and [La2(L)4(aa)3], (a = nitrate (1), thiocyanate (2), acetate (3) and propionate (4) ions, aa = sulphate (5), thiosulphate (6), oxalate (7) and malonate (8) ions with the ligand 4-nitrosoantipyrine (L) were synthesized and characterized using various physico-chemical studies. The primary ligand L acts as a bidentate ligand utilizing the carbonyl group and the nitroso group for bonding. The nitrate, thiocyanate, acetate and propionate ions are monovalent unidentate ligands, whereas sulphate, thiosulphate, oxalate and malonate ions are divalent bidentate ligands in the complexes 1-8. Based on spectral data and magnetic susceptibility measurements, geometry of the lanthanum(III) complexes were also proposed.


4-Nitrosoantipyrine, Lanthanum(III) complexes.

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