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Stability Constants of the Ternary Complexes Formed Between Copper(II), 1,10ʹ-Phenanthroline and Selected Amino Acids

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Abstract

The speciation in aqueous solution at 25 °C using 1.0 mol·dm−3 KNO3 as the ionic medium, was studied on the ternary copper(II) complexes formed with 1,10'-Phenanthroline (Phen) and the amino acids: Glycine (HGly, HL), α-Alanine (HαAla, HL), β-Alanine (HβAla, HL), Proline (HPro, HL), Serine (HSer, HL), Threonine (HThr, HL), Methionine (HMet HL) and Phenylalanine (HPhe, HL). The potentiometric data were analyzed with the program LETAGROP. The stability of the ternary complexes compared to the binary ones were evaluated in terms of ∆log K and % R.S. To analyze the potential structures present in the solution, we examined the absorption and circular dichroism (CD) spectra. Our analysis indicated the existence of ternary complexes, most of which exhibited square pyramid geometry for most of the amino acids. Nevertheless, the circular dichroism investigations suggested that these ternary complexes were unstable, potentially due to the presence of inversion bands.

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Authors and Affiliations

  1. Departamento de Química, Universidad Simón Bolívar (USB), Valle de Sartenejas, Apartado 89000, Caracas, 1080 A, Venezuela

    Waleska Madden, Lino Hernández, Lorenzo Echevarria & Vito Lubes

  2. Centro de Equilibrios en Solución. Escuela de Química. Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela

    Edgar del Carpio & Mary Lorena Araujo

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  1. Waleska Madden
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  2. Edgar del Carpio
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  3. Mary Lorena Araujo
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  4. Lino Hernández
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  5. Lorenzo Echevarria
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  6. Vito Lubes
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Contributions

WM: Experimental work and analysis. EC: Analysis and figures editing. MLA, LH, and VL: Analysis and writing the main manuscript. LE: Analysis of espectroscopic data

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Correspondence to Vito Lubes.

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Madden, W., del Carpio, E., Araujo, M.L. et al. Stability Constants of the Ternary Complexes Formed Between Copper(II), 1,10ʹ-Phenanthroline and Selected Amino Acids. Int J Thermophys 45, 4 (2024). https://doi.org/10.1007/s10765-023-03292-1

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