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Spectrophotometric studies on the Copper Complexes of N‐Alkylated Ethanolamines
Author(s) -
Ojima Heijiroê,
Sone K.
Publication year - 1961
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.19613090112
Subject(s) - ethanolamine , ethanolamines , copper , chemistry , alkyl , aqueous solution , alkylation , absorption (acoustics) , ligand (biochemistry) , absorption band , inorganic chemistry , absorption spectroscopy , adsorption , organic chemistry , materials science , receptor , biochemistry , physics , quantum mechanics , optics , composite material , catalysis
The absorption spectra of the copper complexes of ethanolamine, iso‐propanolamine, and N‐methyl‐, N‐ethyl‐, N,N‐dimethyl‐ and N, N‐diethylethanolamines were studied in their aqueous solutions. When a relatively small quantity of ethanolamine or isopropanolamine was added to a solution containing Cu 2+ ions (5 · 10 −3 M), the complex formed in the solution (complex A) showed an absorption band at ca. 600 mμ, which is also characteristic of the copper complexes of common primary amines; however, with the increase of ligand concentration, or with the addition of a strong base (NaOH), a characteristic spectral change was observed, which indicates the formation of a new type of complex (complex B) in such media with an adsorption band at ca. 520 mμ. Together with the results of the electrophoresis studies, these findings indicate that the probable structures of these two complexes arerespectively; the formation of the former complex is hindered by the N‐alkyl groups much more stronglg than that of the latter.