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A study of the complex compounds of N‐benzenesulphonyl glycine with some metal ions. VIII. Studies on some Metal Chelates of N‐Benzenesulphonyl I‐Glutamic Acid
Author(s) -
Ghosh N. N.,
Dasgupta M.
Publication year - 1970
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19703750315
Subject(s) - chelation , chemistry , dibasic acid , metal ions in aqueous solution , isostructural , titration , metal , glycine , inorganic chemistry , stability constants of complexes , equilibrium constant , precipitation , nuclear chemistry , ion , medicinal chemistry , polymer chemistry , crystallography , amino acid , crystal structure , organic chemistry , biochemistry , physics , meteorology
Abstract Using N‐benzenesulphonyl l‐glutamic acid (RH 3 ) as chelating agent, the preparation of K 4 CuR 2 , 4H 2 O; K 4 HgR 2 , 3H 2 O and Pb(RH 2 )(OH)(H 2 O) has been described. X‐ray powder photographs show that Pb(RH 2 )(OH)(H 2 O) and Cd(RH 2 )(OH)(H 2 O) are isostructural. RH 3 is a weak dibasic acid; pK 2 * and pK 1 * are found to be 3.14 and 4.62 respectively. A study on the formation of Zn and Cd complexes shows that the stability order is Zn ≤ Cd. Acid association constants of the ions HgR 2 4− and CuR 2 4− have been determined only up to two steps because precipitation took place on further titration. These constants are considered to be related to the stability of the complexes and the order is Hg(II) > Cu(II).