Interaction of N-acetyl-L-cysteine (NAC) with Pr3+ (Pr(NO3)3·6H2O) and Nd3+ (Nd(NO3)3·6H2O) ions
are studied in presence of Ca2+ (Ca(NO3)3·4H2O) ion in an aqueous and organic solvent by applying
the spectroscopic technique for quantitative probe of 4f-4f transition. The complexation was determined
by the variation in the intensities of 4f-4f absorption spectral bands and by applying the change of
symmetric properties of electronic-dipole known as Judd-Ofelt parameters Tλ (λ = 2,4,6). On the
addition of Ca2+ ion in the binary complexation of praseodymium and neodymium with
N-acetyl-L-cysteine (NAC) there is an intensification of bands which shows the effect of Ca2+ toward
the heterobimetallic complex formation. Other parameters like Slater-Condon (Fk), bonding (b1/2), the
Nephelauxetic ratio (β), percentage covalency (δ) are also used to correlate the complexation of metals
with N-acetyl-L-cysteine (NAC). With the minor change in coordination around Pr3+ and Nd3+ ions,
the sensitivity of 4f-4f bands is detected and further used to explain the coordination of
N-acetyl-L-cysteine (NAC) with Pr3+ and Nd3+ in presence of Ca2+. The variation in oscillator strength
(Pobs), energy (Eobs) and dipole intensity parameter help in supporting the heterobimetallic complexation
of N-acetyl-L-cysteine. In kinetics investigation, the rate of the complexation of both hypersensitive
and pseudo-hypersensitive transition is evaluated at various temperature in DMF solvent. The value of
the thermodynamic parameters such as ΔHo, ΔSo and ΔGo and activation energy (Ea) also evaluated.
Erratum to: Use of spectroscopic technique to develop a reagent for Mo(VI) utilizing micellar effects on complex formation
