Potentiometric Studies on Complexation of Cu(II) Ion with Methyl/Nitro-Substituted 1,10-Phenanthrolines and Selected Amino Acids
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- 作者：Duygu İnci ; Rahmiye Aydın
- 关键词：Copper(II) ; 4 ; Methyl ; 1 ; 10 ; phenanthroline ; 5 ; Methyl ; 1 ; 10 ; phenanthroline ; 4 ; 7 ; Dimethyl ; 1 ; 10 ; phenanthroline ; 3 ; 4 ; 7 ; 8 ; Tetramethyl ; 1 ; 10 ; phenanthroline ; 5 ; Nitro ; 1 ; 10 ; phenanthroline ; l ; tyrosine ; Glycine stability constants ; Potentiometric methods
- 刊名：Journal of Solution Chemistry
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：46
- 期：1
- 页码：124-138
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Physical Chemistry; Industrial Chemistry/Chemical Engineering; Geochemistry; Oceanography; Inorganic Chemistry; Condensed Matter Physics;
- 出版者：Springer US
- ISSN：1572-8927
- 卷排序：46
文摘
Protonation constants of methyl/nitro substituted 1,10-phenanthrolines {(m/n-sphen): 4-methyl-phenanthroline (4-mphen), 5-methyl-1,10-phenanthroline (5-mphen), 4,7-dimethyl-1,10-phenanthroline (dmphen), 3,4,7,8-tetramethyl-1,10-phenanthroline (tmphen) and 5-nitro-1,10-phenanthroline (5-nphen)] and the amino acids (aa) l-tyrosine (tyr) and glycine (gly), and their corresponding binary and ternary stability constants with Cu(II), were determined in aqueous 0.1 mol·L−1 KCl ionic media at 298.15 K. The protonation constants of the ligands and the stability constants of the binary and ternary complexes of Cu(II) with the ligands were calculated from the potentiometric data using the “BEST” software package. The species distribution diagrams were obtained using the “SPE” software package under the experimental conditions described. The order of stability of the ternary complexes in terms of the primary ligands is [Cu(tmphen)(aa)]+ > [Cu(dmphen)(aa)]+ > [Cu(4-mphen)(aa)]+ > [Cu(5-mphen)(aa)]+ > [Cu(5-nphen)(aa)]+. The stability constants of the ternary complexes decrease in the following order: [Cu(m/n-sphen)(gly)]+ > [Cu(m/n-sphen)(tyr)]+, which is identical to the sequence found for the binary complexes of Cu(II) with gly and tyr.