INTRODUCTION A great deal of work has been reported on the measurement of f ”! f transitions of free and aquo ions of lanthanides in different chemical enviromental 1-4 . In the studies of biological system and as diagnostic agent in clinical medicine, Lanthano ions have been found to be very useful and important 5 . Much work on metal chelates have been carried out with ligands having N and O as donor atoms 6-7 . In the present work Nd (III) ion has been doped in solutions of some organic oximes in the metal to ligand ratio of 1:1 and 1:2. The doped Nd(III) ion in solutions of organic oximes exhibit adsorption spectra characterized by bands in visible region, but these spectra have not been studied extensively 8-10 in terms of various electronic spectral parameters. The values of various electronic spectral parameters like Slater-Condon (F K ), Lande parameter (ς 4f ), Nephelauxetic ratio (β), bonding parameter (b ½ ) Judd-Ofelt parameter (Tλ) and Oriental Journal of Chemistry Vol. 25(4), 999-1004 (2009) Electronic spectral characterization of doped systems of the Nd (III) ion in the solutions of some oximes JAI SHANKER ACHARYA* and R.S. VERMA *Homes Acharya Chowk, Bikaner (India) Department of Chemistry, Government Dunger College, Bikaner - 334 001 (India). (Received: June 12, 2009; Accepted: August 04, 2009) ABSTRACT The Depoed systems of Nd(III) ion in the solution of various organic oximes have been characterized with respect to electronic spectral parameters viz. Slater-Condon (F K ), Lande parameter (ζ 4f ), intensity of hypersensitive band, bonding parameter (B, b ½ del) Judd-Ofelt parameter (T λ ) and Racah parameter (E K ). These various parameters prove the covalent nature of M-L and change in symmetry around Nd(III) ion. The study provides useful information about interelectronic repulsion and spin interaction involved in metal – ligand bond. Key words: Electronic spectral parameters, oximes, Nd(III) ions. Racah parameter (E K ), which gives useful information regarding interelectronic repulsion, spin orbit interaction, Nephelauxetic effect and bonding in the complexes have been computed. EXPERIMENTAL In the present study six organic oximes Acetoxime (L1), Acetophenoneoxime (L2), Benzophenoneoxime (L3), Diacetylmono oxime (L4), Cyclooctanoneoxime (L5) and Camphoreoxime (L6) have been used as ligands. All the chemicals and the solvent used were of analytical grade. The ligands were dissolved to prepare 0.32M and 0.16M solutions in 50% aqueous ethanol (solvent) at room temperature (32 o C). Equal volume (10ml) of each of these 0.32M and 0.16M ligand solution was added in 10ml solution fo 0.16 Nd3+, to get six systems each of having metal to ligand ratio 1:2 and 1:1 respectively. This has been represented by using ‘a’ and ‘b’ along with ligand