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Stability Of 2‐Carboxyphenylhydrazoacetoacetanilide, and 2‐Carboxyphenylhydrazobenzoylacetone Complexes of Rare‐Earth Elements in Mixed Solvents
Author(s) -
Taha Atef A.,
ElInany Gaber A.
Publication year - 1982
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198200042
Subject(s) - chemistry , lanthanide , rare earth , potentiometric titration , polar , chelation , stability constants of complexes , ligand (biochemistry) , inorganic chemistry , dehydration , ion , organic chemistry , mineralogy , receptor , biochemistry , physics , electrode , astronomy , aqueous solution
The overall stability constants of the 1:1 and 2:1 2‐Carboxyphenylhydrazoacetoacetanilide (2‐CPHAAA) and 2‐Carboxyphenylhydrazobenzoylacetone (2‐CPHBA) rare‐earth chelates, were determined by a potentiometric method. The variation of the overall stability constants, “log β” with atomic number, of the lanthanide was ascribed to different degrees of dehydration of the cations. The 2‐CPHBA ligand exhibited less affinity for rare earth cations than 2‐CPHAAA. The correlation of “log β” versus the basicity of the ligands showed that 2‐CPHAAA and 2‐CPHBA form the same type of chelate in polar solvents but differ in non polar solvents.