Influence of sodium dodecyl sulfate on the protolytic properties of N,N-dimethyl-N′-(2-hydroxybenzyl) ethylenediamine and its complexation with copper(II)

被引:0
|
作者
Sal'nikov, YI
Boos, GA
Ryzhkina, IS
Ganieva, ER
机构
[1] Kazan VI Lenin State Univ, Kazan 420008, Russia
[2] Russian Acad Sci, Kazan Res Ctr, AE Arbuzov Organ & Phys Chem Inst, Kazan 420008, Russia
基金
俄罗斯基础研究基金会;
关键词
Absorption - Amines - Catalysis - Complexation - Computer simulation - Copper - Dimerization - Dimers - Hydrogen bonds - Ionic strength - Micelles - Monomers - Refractive index - Sodium compounds - Spectrophotometers - Spectrophotometry;
D O I
10.1023/B:COLL.0000009122.69056.02
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
To investioate the effect of sodium dodecyl sulfate (concentration C-s = 5 and 10 mM) on the acid-base properties of N,N-dimethyl-N'-(2-hydroxybenzy]) ethylenediamine and its complexation with copper(II) (C, = 10 mM) was studied using the methods of potentiometry, spectrophotometry (at 298 K), and mathematical simulation of equilibria in solutions. The sodium dodecyl sulfate contributes to the formation of a monomeric form of N,N-dimethyl-N'-(2-hydroxybenzyl)ethylenediamine, while this compound exists in 40% isopropyl alcohol predominantly in the form of a dimer. The acidic properties of protonated monomeric and dimeric species are weaker than those in an aqueous alcohol solution. Sodium dodecyl sulfate facilitates the coordination of the deprotonated form of ligand. The region of the predominant accumulation of an uncharged complex of 1 : 2 composition is shifted to lower pH values (11.0 and 7.5, respectively), whereas the molar absorption coefficient of the complex increases by approximately 1.7 times. The apparent stability constants of complexes of the same type increase.
引用
收藏
页码:767 / 771
页数:5
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