Complexes of Cysteine and Cysteinemethylester with Pd(II) and Pt(II)

Pneumatikakis, G.; Hadjiliadis, Nick

doi:10.1016/0022-1902(79)80166-9

Cited by 49 publications

(27 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The IR spectrum of the product in the KBr disk showed strong bands in the region 3,237-2,957 cm -1 together with medium bands at 1,625, 532 and 420 cm -1 . The asymmetric COOstretching frequency of the amino acids occurs at 1,580-1,660 cm -1 when the group is coordinated to metals, whereas a non-coordinated COO -group has the m asym (COO -) stretch at lower frequency [25]. The band at 1,625 cm -1 is therefore assigned to the m asym (COO -) of the metal-bounded carboxyl group.…”

Section: Resultsmentioning

confidence: 98%

Mechanistic aspects of ligand substitution on cis-diaqua(cis-1,2-diaminocyclohexane)platinum(II) by Glycine-l-Leucine

Karmakar

Mallick

Bera

et al. 2010

Transition Met Chem

View full text Add to dashboard Cite

The kinetics of the interaction of glycine-Lleucine (Glyleu) with cis-[Pt(cis-dach)(OH 2 ) 2 ] 2? (dach = 1, 2-diaminocyclohexane) has been studied spectrophotometrically as a function of [cis-[Pt(cis-dach)(OH 2 ) 2 ] 2? ], [Glyleu] and temperature at pH 4.0, where the complex exists predominantly as the diaqua species and Glyleu as a zwitterion. The substitution reaction shows two consecutive steps: the first is the ligand-assisted anation and the second is the chelation step. The activation parameters for both the steps were evaluated using Eyring's equation. The low DH 1 = (51.9 ± 2.8 kJmol -1 ) and large negative value of DS 1 = (-152 ± 8 JK -1 mol -1 ) as well as DH 2 = (54.4 ± 1.7 kJmol -1 ) and DS 2 = (-162 ± 5 JK -1 mol -1 ) indicate an associative mode of activation for both the aqua ligand substitution processes.

show abstract

Section: Resultsmentioning

confidence: 98%

Mechanistic aspects of ligand substitution on cis-diaqua(cis-1,2-diaminocyclohexane)platinum(II) by Glycine-l-Leucine

Karmakar

Mallick

Bera

et al. 2010

Transition Met Chem

View full text Add to dashboard Cite

show abstract

“…The IR spectrum of the product as a KBr disk shows strong bands at 3,368-3,207, 1,655, 1,629, and 536 cm -1 and medium bands at 1,735, 1,718, and 409 cm -1 . The asymmetric COO -stretching frequency (m asym ) of the amino acid occurs at 1,580-1,660 cm -1 when the group is coordinated to metals [21], whereas the noncoordinated COO -group has m asym (COO -) at lower frequency [21]. The band at 1,629 cm -1 is therefore assigned to the m asym (COO -) of the metal-bound carboxylate group.…”

Section: Methodsmentioning

confidence: 98%

Kinetics and mechanism of the reaction of hydroxopentaaquarhodium(III) ion with l-Arginine in aqueous solution

Bera

Mallick

Mandal

et al. 2010

Transition Met Chem

View full text Add to dashboard Cite

The kinetics of the aqua ligand substitution from hydroxopentaaquarhodium(III) ion, [Rh(H 2 O) 5 (OH)] 2? , by L-Arginine has been studied spectrophotometrically as a function of Arginine concentration, and temperature, at pH 4.3. The reaction proceeds via a rapid outer sphere association complex formation step followed by two consecutive steps. The first of these involves ligand-assisted anation, while the second involves chelation as the second aqua ligand is displaced. The association equilibrium constant for the outer sphere complex formation has been evaluated together with the rate constants for the two subsequent steps. The activation parameters for both steps have been evaluated using Eyring's equation. Thermodynamic parameters calculated from the temperature dependence of the outer sphere association equilibrium constants are also consistent with an associative mode of activation. The product of the reaction has been characterized by conductivity measurement and IR spectroscopic analysis.

show abstract

“…The IR spectra of all the product complexes, in KBr discs, show strong bands in the region ∼3512-3074 cm −1 together with medium bands at 1600, 539 and 404 cm −1 . The asymmetric COO − stretching frequency (ν asym ) of the amino acids occurs at 1580-1660 cm −1 when the group is coordinated to metals, whereas a non-coordinated COO − group has ν asym (COO − ) stretching at lower frequency [18]. The band at 1600 cm −1 is therefore due to the ν asym (COO − ) of the metal-bound carboxyl group.…”

Section: Product Analysismentioning

confidence: 97%

Kinetic Study of the Interaction of Three Glycine-Containing Dipeptides with Hydroxopentaaquarhodium(III) Ion in Aqueous Medium

et al. 2012

View full text Add to dashboard Cite

The kinetics of the interaction of three glycine-containing dipeptides, namely, glycyl-L-valine (L 1 -L H), glycyl-glycine (L 2 -L H) and glycyl-L-glutamine (L 3 -L H), with [Rh(H 2 O) 5 OH] 2+ has been studied spectrophotometrically in aqueous medium as a function of the Rh(H 2 O) 5 OH 2+ and dipeptide concentrations, pH and temperature, at constant ionic strength. At pH = 4.3, the substrate complex exists predominantly as the hydroxopentaaqua species and dipeptides as zwitterions. The reaction has been found to proceed via two parallel paths: both processes are ligand dependent. The rate constants for the processes are of the order: k 1 ∼ 10 −3 s −1 and k 2 ∼ 10 −5 s −1 . The activation parameters for both steps were evaluated from Eyring plots. Based on the kinetic and activation parameters an associative interchange mechanism is proposed for both of the interaction processes. The low H = 1 and H = 2 values and large negative values of S = 1 and S = 2 support the associative mode of activation for both processes. The product of the reaction has been characterized using IR and ESI-mass spectroscopic analysis.

show abstract

Complexes of Cysteine and Cysteinemethylester with Pd(II) and Pt(II)

Cited by 49 publications

References 15 publications

Mechanistic aspects of ligand substitution on cis-diaqua(cis-1,2-diaminocyclohexane)platinum(II) by Glycine-l-Leucine

Mechanistic aspects of ligand substitution on cis-diaqua(cis-1,2-diaminocyclohexane)platinum(II) by Glycine-l-Leucine

Kinetics and mechanism of the reaction of hydroxopentaaquarhodium(III) ion with l-Arginine in aqueous solution

Kinetic Study of the Interaction of Three Glycine-Containing Dipeptides with Hydroxopentaaquarhodium(III) Ion in Aqueous Medium

Contact Info

Product

Resources

About