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The Stability Constants of Copper(II) Complexes with Some α-Amino Acids in Dioxan–Water Mixtures

✍ Scribed by Alev Doğan; Fitnat Köseoğlu; Esma Kılıç

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
49 KB
Volume
295
Category
Article
ISSN
0003-2697

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✦ Synopsis

In this study, the overall stability constants of copper(II) complexes with some ␣-amino acids (glycine, DL-alanine, DL-valine, L-leucine, L-asparagine, L-glutamine) were determined by potentiometric titration in water, 25% dioxan-75% water, 35% dioxan-65% water, 50% dioxan-50% water, and 60% dioxan-40% water. The titrations were performed at 25°C, under nitrogen atmosphere, and the ionic strength of the medium was maintained at 0.10 M by using sodium perchlorate. The formation curves of their complexes (n -p[L]) were obtained by means of the titration data. Then the stability constants were determined in relation to these curves. The mol ratio of copper(II) to ␣-amino acid was also determined and it was found that the complexes were CuL 2 type. Another important result obtained was that the tendency of amino acids to form complexes with copper(II) was greater in dioxan-water mixtures compared to water.

📜 SIMILAR VOLUMES

Studies on the Protonation Constants and
Studies on the Protonation Constants and Solvation of α-Amino Acids in Dioxan–Water Mixtures
✍ Fitnat Köseoglu; Esma Kiliç; Alev Dogan 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 53 KB

To gain more information about the effect of solvent on ␣-amino acids, the stoichiometric protonation constants of 10 ␣-amino acids (glycine, DL-alanine, DL-valine, L-leucine, L-isoleucine, DL-phenylalanine, Lserine, L-threonine, L-asparagine, and L-glutamine) in different dioxan-water mixtures have