Studies in ferrimetry

Rao, K. Bhaskara; Rao, G. Gopala

doi:10.1007/bf00447853

Cited by 8 publications

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“…Considerable interest has recently been evinced in the study of metal complexes of aminoacids containing catecholic or phenolic side chains mainly due to the potentially multidentate ligational behaviour of aminoacids (Birch and Manhan 1967;Weber and Simon 1971;Gergely etal 1971;Van der Helm and Tatsch 1972;McAuliffe and Murray 1973). This interest has led us to the synthesis and spectral studies on Ln(III) complexes and in continuation of our earlier work on rare earth metal complexes of various N, O-donor ligands, derived from tyrosine and glycine (Rao et al 1986 1987; Rao and Singh t989;Rao and Kumar 1994). We report here the results of our structural investigations on the Ln(III) complexes of 2,4-dihydroxybenzaldehyde (N-benzoyl)glycyl hydrazone, H3dhbbgh (figure 1).…”

Section: Introductionmentioning

confidence: 95%

Studies on some rare earth metal complexes: Ten- and six-coordinated complexes of an unsymmetrical aminoacid derivative

Kumar

Rao

1997

Proc. Indian Acad. Sci. (Chem. Sci.)

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2,4-Dihydroxybenzaldehyde(N-benzoyl)glycyl hydrazone, H3 dhbbgh, has been synthesized and characterized. Rare earth metal complexes of the empirical formulae, [Ln(Hadhbbgh)2C12]Cl.nH20 and [Ln(dhbbgh)(H20)2],where Ln = La(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Tb(III), Dy(III) and Y(III) have been synthesized and characterized by elemental analyses, molar conductances, magnetic susceptibilities, electronic, infrared and NMR spectral studies. Various bonding parameters (fl, b 1/2, % ~ and r/) calculated from the electronic spectra of Pr(III), Nd(III), Sm(III) and Dy(III) complexes suggest a weak covalent bond between the metal and ligand. The theoretical oscillator strengths (Pealed) and a set of three intensity parameters (T~=z,4.6) computed from the Judd-Ofelt equation are found to be in good agreement with experimental values. On the basis of the spectral profiles of the hypersensitive transitions (419/z---~4Gs/2, 2G7/2) in the Nd(llI) complexes, coordination numbers ten and six have been proposed for the Ln(III) ions in the adduct and deprotonated complexes respectively. Keywords. Lanthanide metal complexes; 2,4-dihydroxybenzaldehyde(N-benzoyl) glycyl hydrazone; hypersensitive transitions.

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Section: Introductionmentioning

confidence: 95%

Studies on some rare earth metal complexes: Ten- and six-coordinated complexes of an unsymmetrical aminoacid derivative

Kumar

Rao

1997

Proc. Indian Acad. Sci. (Chem. Sci.)

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“…16,17 Because NH2OH is unstable, and is therefore present only in trace amounts, 9 there are no good quantitative methods applicable to aqueous environmental samples. Spectrophotometry 16,[19][20][21] and titration 22 are typical quantitative methods for NH2OH determination. A procedure based on the oxidation of NH2OH to NO2 with iodine and colorimetry of NO2 has been developed.…”

Section: Introductionmentioning

confidence: 99%