Stability constants of the ternary copper(II) complexes with 2-(benzo(d)oxazol-2-yl)nicotinic acid and some amino acids

被引：0

作者：

Urdaneta, Neudo ^{[1
]}

Grazziani, Nubia ^{[1
]}

Landaeta, Vanessa R. ^{[1
]}

Rodriguez-Lugo, Rafael ^{[1
,2
]}

Araujo, Mary Lorena ^{[3
]}

Del Carpio, Edgar ^{[4
]}

Hernandez, Lino ^{[1
,5
]}

Lubes, Vito ^{[1
,5
]}

机构：

[1] Univ Simon Bolivar, Chem Dept, Caracas, Venezuela

[2] Venezuelan Inst Sci Res, Chem Ctr, Bioinorgan Chem Lab, Caracas, Venezuela

[3] Cent Univ Venezuela, Sci Fac, Ctr Equilibria Solut, Chem Sch, Caracas, Venezuela

[4] Cent Univ Venezuela, Fac Pharm, Sch Dr Jesus Maria Bianco, Med Chem Unit, Caracas, Venezuela

[5] Univ SimonBolivar USB, Dept Quim, Valle Sartenejas, Apartado 89000, Caracas 1080, Venezuela

来源：

JOURNAL OF COORDINATION CHEMISTRY | 2023年

关键词：

Copper(II) complexes; amino acids; potentiometric studies; speciation; ternary complexes;

D O I：

暂无

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

this work, we present the results from a study of the speciation of the ternary systems formed by copper(II),2-(benzo(d)oxazol-2-yl)nicotinic acid (Oxa, HL) as the main ligand, and the amino acids Serine (Ser, A(-)), Threonine (Thr, A(-)), Methionine (Met, A(-)), Phenylalanine (Phe, A(-)), Aspartate (Asp, A(2-)), Glutamate (Glu, A(2-)), and Histidine (His, A(-)) as secondary ones. The potentiometric data was analyzed using the computational program LETAGROP for systems in aqueous solution at 25 degrees C and 1.0M KNO3 as the ionic medium. The ternary complexes [Cu(L)(HA)]thorn, [Cu(L)(A)], [Cu(L)(2)(A)]-, [Cu(L)(A)2]-, [Cu(L)(A)(OH)]- and [Cu(L)(A)(OH)(2)](2-) were detected. The relative stability of the ternary complexes was compared to the binary ones considering the values of Delta logK and log chi (defined in text of results and analysis). Subsequently using the formation constants, the species distribution diagrams were generated and are briefly discussed. The UV-visible spectra of the ternary complexes show a maximum at 610-654nm indicating that the Cu2thorn is penta-coordinated.

引用

页数：13