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Protonierte Metallkomplexe zweizähniger Liganden
Author(s) -
Schwarzenbach G.,
Szilard I.
Publication year - 1962
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19620450419
Subject(s) - chemistry , protonation , chelation , malonate , metal , ligand (biochemistry) , metal ions in aqueous solution , medicinal chemistry , stability constants of complexes , stereochemistry , inorganic chemistry , ion , receptor , organic chemistry , biochemistry
Quite often some of the ligand atoms of a chelating agent are protonated while others simultaneously are attached to a metal cation. Metal‐hydrogen‐complexes of that kind have usually been neglected in the elucidation of the equilibria between the various metal ions and chelating ligands. A general method is described by which the concentration of these protonated metal complexes can be obtained. The method is applied to the six systems: Cd 2+ and Malonate (= Mal 2− ), Cd 2+ and Succinate (= Succ 2− ), Cd 2+ and Trimethylenediamine (= Triam), Cd 2+ and Tetramethylenediamine (= Tetram), Hg 2+ and Tetramethylenediamine; Hg 2+ and Pentamethylenediamine (= Pentam). The stability constants of the following complexes are given: CdMal, CdHMal + , Cd(Mal) 2 2− , CdH(Mal) 2 − , Cd(HMal) 2 ; CdSucc, CdHSucc 2 + , Cd(Succ) 2 2− ; CdTriam 2+ , CdHTriam 3+ ; CdTetram 2+ , CdHTetram 3+ ; HgTetram 2+ , HgHTetram 3+ , Hg(HTetram) 2 4+ ; CdPentam 2+ , CdHPentam 3+ , Cd(HPentam) 2 4+ .