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1.
Effect Of Solvents On Stability Constants Of Lanthanides Metal
Complexes With Some Substituted Pyrazoles
GOPALKRUSHNA H. MURHEKAR* and ARUN R. RAUT
Organic synthesis Division, PG Department of Chemistry, Government
Vidarbha, Institute of Science And Humanities, Amravati, 444604
(M.S.), India.
* gopalmurhekar@gmail.com
Abstract:
The reaction of Pr (III) and Nd (III) metal ions with L1
: 3 (2’- chlorophenyl) - 4- benzoyl - 5 (2-hydroxy phenyl)
pyrazole, L2: 3 (2’-chlorophenyl) - 4- pyridoyl
-5 (2-hydroxy phenyl) pyrazole , L3: 3 (2’-aminophenyl)-
4-pyridoyl - 5 (2- hydroxyl phenyl) pyrazole and L4:
3 (4’-chlorophenyl) -4-Benzoyl -5(2-hydroxy-phyenyl)
pyrazole, at 0.1M ionic strength at 28 ± 0.10C in
70% ethanol -water mixture and 70% dioxane-water mixture
have been studied pH-metrically. The data obtained were used
to estimate the values of proton-ligand (pK) and metal-ligand
(logK) stability constants in different solvents mixture. It
is observed that the pK and logK values in 70% dioxane-water
mixture are grater than in 70% ethanol -water mixture. Pr
(III) and Nd (III) metal ions formed 1:1 and 1:2 complexes
with all the ligands in both solvent medium.
KEY WORDS:
Substituted pyrazole, solvent effect,
stability constants, chelates.
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