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The Complexation Behaviour of Crown Ethers with Some Divalent Transition Metal and Silver Ions in a 40%(v/v) Ethanol + Water Medium
Author(s) -
Ijeri Vijaykumar S.,
Srivastava Ashwini K.
Publication year - 2001
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200104)2001:4<943::aid-ejic943>3.0.co;2-n
Subject(s) - chemistry , potentiometric titration , crown ether , inorganic chemistry , divalent , conductometry , metal , stability constants of complexes , ether , titration , molar conductivity , cryptand , metal ions in aqueous solution , qualitative inorganic analysis , transition metal , ion , organic chemistry , catalysis
The stability constants in 40%(v/v) ethanol + water mixture were evaluated for complexes of Ni II , Co II , Cu II , Zn II , Mn II and Ag I with the macrocyclic polyethers 15‐crown‐5, benzo‐15‐crown‐5, 18‐crown‐6 and dicyclohexano‐18‐crown‐6 by conductometric titrations. In addition, a potentiometric study of the Cu II and Ag I complexes was undertaken to compare the results with those obtained by conductivity measurements. The complexation studies indicate 1:1 complex formation between the metal ion and crown ether and the log K ML n+values are in the range 1.0−3.0. The limiting molar conductivities of the metal ions and their crown ether complexes were also determined.