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http://nopr.niscpr.res.in/handle/123456789/15837| Title: | Studies on lanthanide(III) complexes of nuclear substituted diphenylcarbazones |
| Authors: | Siddalingaiah, A H M Veerabhadra, H M Swamy, M |
| Issue Date: | Aug-1999 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | La(III), Ce(III), Pr(III), Nd(III), Sm(III), Dy(III) and Ho(III)
complexes of 1,5-di(2,5-dimethylphenyl)carbazone and 1 ,5-di(5-chloro- 2-methylphenyl)carbazone
have been synthesised and characterized on the basis of elemental analysis,
molar conductances, magnetic moments and spectral studies (electronic absorption,
infrared and 1H-NMR spectra). The complexes conform to the
composition Ln[(DPC)2(NO3) 2]NO32H2O.
The substituted diphenylcarbazones act as neutral bidentate ligands and the
complexes appear to be six-coordinated. The IR data suggest coordination of the
ligand to the metal ions in the
bidentate fashion through the oxygen of the carbonyl (>C=O) group
and nitrogen of azo(-N=N-) group. Presence of two water molecules is indicated
which are outside the coordination sphere. The antimicrobial screening of the
ligands and their complexes
has been carried out. Proton-ligand and metal-ligand formation constants
of the above complexes have also been determined pH-metrically in 50% (v/v) aqueous dioxane medium at 25°, 35° and 45°C
and ionic strength μ=0.1M (NaClO4).
The thermodynamic parameters of complex formation have been evaluated.
Stabilities (logK1 values)
of the chelates are found to increase with decrease in ionic radii of the
metals, i.e., La(III) |
| Page(s): | 833-838 |
| Appears in Collections: | IJC-A Vol.38A(08) [August 1999] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCA 38A(8) 833-838.pdf | 2.08 MB | Adobe PDF | View/Open |
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