Copper(II) chelation kinetics.  III.  Steric effects

Brubaker, J. W.; Pearlmutter, A. Frances; Stuehr, J. E.; Vu, T. V.

doi:10.1021/ic50133a012

Cited by 23 publications

(8 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The complexation rate constant of 1-4 3 10 9 M 21 s 21 for step 1 is relatively faster than the constant of 2 3 10 8 M 21 s 21 for step 2. [38][39][40][41] The specific increase in the C1 redox peak in the presence of amino acids provides first evidence for the formation of the Cu II O-amino acid complexes in the present system (Fig. 2A).…”

Section: Electrochemical Behavior Of Amino Acids At the Cu N -Spe 100-nmsupporting

confidence: 52%

See 1 more Smart Citation

Amino acid analysis using disposable copper nanoparticle plated electrodes

Zen

Hsu

Kumar

et al. 2004

Analyst

View full text Add to dashboard Cite

A disposable copper nanoparticle-plated screen-printed carbon electrode (designated as Cun-SPE(100-nm)) provides a new material for the determination of native amino acids. All 20 underivatized amino acids can be sensitively determined at 0.0 V vs. Ag/AgCl in pH 8 phosphate buffer solution. The precisely controlled copper nanoparticles can boost up the CuIIO/CuI2O redox signal on the working surface without any prior pretreatment procedure. The formation of a reversible 1:1 CuIIO-amino acid complex on the Cun-SPE(100-nm) was proposed to play a key role in the reaction mechanism. Stable detection responses were obtained for all amino acids by flow injection analysis with detection limits (S/N = 3) that lie in the range of 24 nM-2.7 microM. Selected amino acids from six representative chemical natures were separated by HPLC and detected at the Cun-SPE(100-nm) with promising results.

show abstract

Section: Electrochemical Behavior Of Amino Acids At the Cu N -Spe 100-nmsupporting

confidence: 52%

“…Normally, amino acids possess a bidentate ligand, where the -COO 2 and -N terminals function as the chelating site. [38][39][40][41] Classical solution phase study indicates a twostep process for the Cu II (metal ion)-amino acid complexation as follows:…”

Section: Electrochemical Behavior Of Amino Acids At the Cu N -Spe 100-nmmentioning

confidence: 99%

Amino acid analysis using disposable copper nanoparticle plated electrodes

Zen

Hsu

Kumar

et al. 2004

Analyst

View full text Add to dashboard Cite

show abstract

“…Many experimental results can be interpreted by assuming that (15)(16)(17)(18)(19)(20)(21) the rate of dissociation of a complex is sterically controlled by the formation step ks, Eq. [5].…”

Section: Discussionmentioning

confidence: 99%

Ligand Effects in Electroless Copper Deposition

Paunović¹

1977

J. Electrochem. Soc.

View full text Add to dashboard Cite

The induction period and cathodic processes in electroless deposition of copper have been studied by galvanostatic, chronopotentiometric, and potential sweep methods. It is shown that the factors which determine the duration of the induction period are the type and concentration of the ligand that is complexing the copper ions. The rate-determining factor is the rate of establishment of the potential of the partial anodic process. Dissociation of a copper complex preceding the charge transfer in the electrochemical and electroless deposition of copper has been studied by chronopotentiometry and potential sweep method. Chronopotentiometric i~ 1j2 --](i) and potentialfunctions have been used to estimate the relative rates of dissociation. The properties of the complexes of Cu(II) with ethytenediaminetetraacetic acid (EDTA), N,N,N',N'-tetrakis-2 (2-hydroxypropyl)ethylenediamine (Quadrol), cyclohexane-1, 2-diamine-N,N,N',N'-tetraacetic acid (CDTA), and tartaric acid have been studied. The galvanostatic transient technique has been usea for kinetic studies of coPper deposition. A definite correlation has been established between the rate of dissociation of the complex and the rate of metal deposition. The rate of deposition of copper and the rate of dissociation of complex as a function of a ligand increase in the order: tartrate, EDTA, Quadrol, CDTA complex.

show abstract

“…A considerable number of studies have been conducted on copper(II) complexes with amino acids and peptides for various properties such as geometries, rate constants, and electronic structures. [6][7][8][9][10][11][12][13][14] Especially, copper(II)-glycine complexes have been investigated both experimentally [15][16][17][18][19][20][21][22][23] and theoretically 24,25 because of their simplicity and intrinsic relevance in biological reactions. Copper(II) complexes represent the so-called Jahn-Teller distortion due to the d 9 electronic configuration of the metal cation.…”

Section: Introductionmentioning

confidence: 99%

Chemical Exchange Reaction of Glycinatocopper(II) Complex in Water: A Theoretical Study

et al. 2005

View full text Add to dashboard Cite

The axial water exchange on glycinatocopper(II) complexes was theoretically investigated by using density functional theory (DFT) calculations. Glycinatocopper(II) complexes are well-known by the diffusion controlled exchange of axial ligands. Calculations using explicitly coordinating water molecules and solvent models showed that bis-glycinatocopper(II) complexes have a four-coordinate planar structure, in which waters are excluded from the axial positions of Cu(II) due to the Jahn-Teller effect. This may be because coordinating axial waters induce the discrepancy in the most stable ligand field splittings of inner 3d and outer 4d orbitals of the Cu(II) cation. To estimate the reactivity of the axial water exchange, we calculated the rate constant by calculating Gibbs free energies for the activation. As a result, we obtained the rate constant as k = 3.61 x 10(10) s(-1) in aqueous solution at T = 298.15 K. This rate constant is slightly larger than that of the diffusion controlled exchange of axial waters, which is experimentally observed in the order of 10(9) s(-1). Finally, we determined the structures of tris-glycinatocopper(II) complexes. It was consequently found that the third glycine is coordinated to Cu with the amino groups as experimentally observed.

show abstract

Copper(II) chelation kinetics. III. Steric effects

Cited by 23 publications

References 11 publications

Amino acid analysis using disposable copper nanoparticle plated electrodes

Amino acid analysis using disposable copper nanoparticle plated electrodes

Ligand Effects in Electroless Copper Deposition

Chemical Exchange Reaction of Glycinatocopper(II) Complex in Water: A Theoretical Study

Contact Info

Product

Resources

About