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Thermodynamical study on the formation of some mixed ligand complexes of non‐transition metal ions in solution I. The formation and the stability of some Pb(II) mixed ligand complexes
Author(s) -
Liu QiTao,
Zhang Feng,
Song XiMing,
Gao EnJun
Publication year - 1991
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19910090506
Subject(s) - chemistry , ligand (biochemistry) , potentiometric titration , malonate , stability constants of complexes , ionic strength , transition metal , metal , inorganic chemistry , titration , ionic bonding , metal ions in aqueous solution , ion , organic chemistry , receptor , biochemistry , aqueous solution , catalysis
The stability constants of the binary complexes of type PbB, PbB 2 , and the mixed ligand complexes of type PbAB have been studied by potentiometric pH titration technique at ionic strength I = 0.10 (KNO 3 ) and at temperature 15, 25, 35 and 45°C respectively, where A = 2,2′‐bipyridyl (bipy) or 1,10‐phenanthroline (phen); B = malonate (mal), succinate (suc), or anthranilate (anth). The equalibrium constants ΔlogK, 1 ΔΔG , ΔΔH , and ΔΔS of the reaction PbA + PbB = PbAB + Pb 2+ have been calculated. The results show that the discriminating effects 2 between the primary ligand (bipy or phen) and the secondary ligand (mal, suc or anth) in those non‐transition metal mixed ligand complexes are also evident, and as a measurement of this effect, ΔΔ H is more appropriate than Δ logK. The possible reasons which lead to these results have been discussed.