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Metal Complexes of Alizarin IV—The Structure of the Potassium and Calcium Salts of Alizarin and of 3‐Nitroalizarin
Author(s) -
Kiel E. G.,
Heertjes P. M.
Publication year - 1963
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1963.tb02555.x
Subject(s) - chemistry , salt (chemistry) , alizarin , potassium , calcium , monobasic acid , metal , inorganic chemistry , aluminium hydroxide , calcium salts , potassium hydroxide , double salt , aluminium , nuclear chemistry , polymer chemistry , organic chemistry
The preparation of the potassium and calcium salts of alizarin and of 3‐nitroalizarin is described. Their structures have been established and compared with those of salts of complex alizarates containing the same metals, which have been described in the preceding parts of this series. It was already known that, prior to complex formation, salt formation must take place. With the knowledge of the structure of these salts, the mechanism of complex formation following salt formation has been established. An intermediate monobasic salt, e.g. potassium 2‐alizarate or the acid calcium 2‐alizarate, is formed, from which the complexes are produced with the chelating metal ion. During dyeing with Turkey Red (calcium‐aluminium lake of alizarin), calcium alizarate is not formed, because the intermediate acid calcium salt reacts more quickly with aluminium hydroxide to form the complex than the calcium atom in the acid salt reacts with the 1‐OH group.