Adenine-Metal Complexes<sup>1,2</sup>

Harkins, Thomas R.; Freiser, Henry

doi:10.1021/ja01538a030

Cited by 67 publications

(23 citation statements)

References 6 publications

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“…The values found are in agreement with the literature values [6][7][8]. In order to establish stability constants of the mixed-ligand complexes, the Irwing-Rossotti method was also used [2].…”

Section: The Determination Of Stability Constantssupporting

confidence: 88%

Potentiometric studies of mixed complexes of cobalt(II) and copper(II) with l‐Asparagine and adenine

Demir

Pekin

Cucu

et al. 1999

Toxicological & Environmental Chemistry

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A potentiometric titration technique has been used to determine the stability constants for the various complexes of Co(II) and Cu(II) with L-asparagine and from DNA base, e.g. adenine. Stability constants of ternary systems have been evaluated by the method suggested by IrwingRossotti. In addition, the conditional constants were calculated as a function of pH. The maximum values of the conditional formation constants were found to be in accordance with the mixed-ligand complex formation constants in a determined pH region. Furthermore, the molar fractions of different species from mixed complexes were calculated by means of formation constants. The values of stability constants of mixed-ligand complexes at 25°C are as follows: log K= 5.25 for Co(II)-L-asparagine-adenine; log K= 9.30 for Cu(II)-L-asparagine-adenine. The ionic strength was kept constant at I = 0.20 with NaClO 4 .

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Section: The Determination Of Stability Constantssupporting

confidence: 88%

Potentiometric studies of mixed complexes of cobalt(II) and copper(II) with l‐Asparagine and adenine

Demir

Pekin

Cucu

et al. 1999

Toxicological & Environmental Chemistry

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“…The stability constants were determined from these graphs (Table II). The values found are in agreement with literature values [5,6]. In order to establish stability constants of the mixed ligand complexes, the Irwing-Rossotti method was also used [1].…”

Section: The Determination Of Stability Constantssupporting

confidence: 87%

Formation constants in the ternary systems: Co(II)‐L‐Cysteine ‐ Adenine & Zn(II)‐L‐Cysteine‐Adenine₂

Cucu

Pekin

Demir

et al. 2001

Toxicological & Environmental Chemistry

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A potentiometric titration technique has been used to determine stability constants for the various complexes of Co(II) and Zn(II) with L-cysteine and from DNA bases i.e. Adenine. Stability constants of ternary systems have been evaluated by the method suggested by Irwing-Rossotti. In addition, the conditional constants were calculated as a function of pH.The maximum values of the conditional formation constants were found to be in accordance with the mixed-ligand complex formation constants at a given pH region. Furthermore, the molar fractions of different species from mixed complexes were calculated by means of formation constants. The values of stability constants of mixed-ligand complexes at 25°C are as follows: log K=9.50 for Co(II)-L-cysteine-Adenine; log K 1 = 6.85 and log K 2 = 6.00 for Zn(II)-L-cysteine-Adenine 2 . The ionic strength was kept constant at I = 0.20 with NaClO 4 .

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“…The stability constants of these complexes (Eqs. 1, 2) were calculated with the BEST software at 0.1 molÁL -1 KNO 3 ionic medium at 25.00°C; these are presented in Table 2 and determined to be in line with the values found in the literature [38,44,45]. They show that the larger metal ions (such as Cd(II) (ionic radius = 95 pm) or Hg(II) (102 pm) will coordinate in a chelate fashion between the N(3) and N(9) while the smaller metal ion Zn(II) (74 pm) will fit better in the smaller chelate ring size between N(7) and N(10) for adenine ( Fig.…”

Section: Copper(ii)-adenine Equilibriasupporting

confidence: 66%

Equilibrium Study of the Mixed Complexes of Copper(II) with Adenine and Amino Acids in Aqueous Solution

Türkel

2015

J Solution Chem

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In the present study, the protonation constants of adenine (Ade), a DNA base, and of the amino acids aspartic acid, glutamic acid, asparagine, leucine, phenylalanine and tryptophan, were determined in 0.1 molÁL -1 KNO 3 ionic medium and at 25.00°C by the potentiometric method. The binary and ternary ligand complex systems that Cu(II) establishes with Ade and these amino acids were examined using the same method and in the same ionic medium; stability constants were calculated with the BEST computer software and distribution curves were drawn by means of the SPE software. The relative stability of each ternary complex was compared with that of the corresponding binary complexes in terms of their Dlog 10 K values.

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Adenine-Metal Complexes^1,2

Cited by 67 publications

References 6 publications

Potentiometric studies of mixed complexes of cobalt(II) and copper(II) with l‐Asparagine and adenine

Potentiometric studies of mixed complexes of cobalt(II) and copper(II) with l‐Asparagine and adenine

Formation constants in the ternary systems: Co(II)‐L‐Cysteine ‐ Adenine & Zn(II)‐L‐Cysteine‐Adenine₂

Equilibrium Study of the Mixed Complexes of Copper(II) with Adenine and Amino Acids in Aqueous Solution

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Adenine-Metal Complexes1,2

Cited by 67 publications

References 6 publications

Potentiometric studies of mixed complexes of cobalt(II) and copper(II) with l‐Asparagine and adenine

Potentiometric studies of mixed complexes of cobalt(II) and copper(II) with l‐Asparagine and adenine

Formation constants in the ternary systems: Co(II)‐L‐Cysteine ‐ Adenine & Zn(II)‐L‐Cysteine‐Adenine2

Equilibrium Study of the Mixed Complexes of Copper(II) with Adenine and Amino Acids in Aqueous Solution

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Adenine-Metal Complexes^1,2

Formation constants in the ternary systems: Co(II)‐L‐Cysteine ‐ Adenine & Zn(II)‐L‐Cysteine‐Adenine₂