Spectrophotometric quantification of the thermodynamic constants of the complexes formed by dopamine and Cu(II) in aqueous media.
The thermodynamic constants of the complex Cu(II)-dopamine in aqueous solution were evaluated from spectrophotometric data using the software SQUAD. It was found that there exist Cu(II):DA complexes with 1:1 and 1:2 stoichiometries and that their predominance depends on both the solution pH and the [Cu(II)]/[DA] ratio. Moreover, it is shown that the solubility of Cu(OH)2(s) increases drastically when these complexes are thermodynamically stable.
Universidad Autónoma Metropolitana-Iztapalapa, Departamento de Química, Área de Química Analítica, San Rafael Atlixco 186, Col. Vicentina, Del. Iztapalapa, C.P. 09340 México DF, Mexico.
B
B
Verastegui-Omaña
Universidad Autónoma Metropolitana-Azcapotzalco, Área Ingeniería de Materiales, Departamento de Materiales, Av. San Pablo 180, Col. Reynosa-Tamaulipas, C.P. 02200 México DF, Mexico.
M
M
Palomar-Pardavé
Universidad Autónoma Metropolitana-Iztapalapa, Departamento de Química, Área de Química Analítica, San Rafael Atlixco 186, Col. Vicentina, Del. Iztapalapa, C.P. 09340 México DF, Mexico.
A
A
Rojas-Hernández
Universidad Autónoma Metropolitana-Azcapotzalco, Área Ingeniería de Materiales, Departamento de Materiales, Av. San Pablo 180, Col. Reynosa-Tamaulipas, C.P. 02200 México DF, Mexico.
S
S
Corona Avendaño
Universidad Autónoma Metropolitana-Azcapotzalco, Área Ingeniería de Materiales, Departamento de Materiales, Av. San Pablo 180, Col. Reynosa-Tamaulipas, C.P. 02200 México DF, Mexico.
M
M
Romero-Romo
Universidad Autónoma Metropolitana-Iztapalapa, Departamento de Química, Área de Química Analítica, San Rafael Atlixco 186, Col. Vicentina, Del. Iztapalapa, C.P. 09340 México DF, Mexico. Electronic address: mtrs218@xanum.uam.mx.
M T
MT
Ramírez-Silva
D056831:Coordination Complexes / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D004298:Dopamine / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D013053:Spectrophotometry; D013816:Thermodynamics; D014867:Water
D056831:Coordination Complexes; D014867:Water; D003300:Copper; D004298:Dopamine
Complexation constants; Copper(II); Dopamine; SQUAD; Spectrophotometry