Thermodynamic, kinetic and structural studies on the mixed ligand complexes of palladium(II) with tridentate and monodentate ligands

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Abstract

Stability constants of the complexes formed in the reaction of [Pd(bpma)]2+ [bpma=bis(pyridin-2-ylmethyl)amine] with monodentate nitrogen and thioether ligands including uridine, MeUH, cytidine, MeC, EtGH, AcHis, AcHm, AcLys and AcMet were determined by potentiometric method. The coordination chemistry of [Pd(bpma)]2+ shows a significant similarity to that of [Pd(terpy)]2+, but it is different from [Pd(dien)]2+. The formation of hydroxo and dinuclear complexes is especially enhanced in the case of [Pd(bpma)]2+ and [Pd(terpy)]2+, but the affinity of palladium(II) ions for the coordination of thioether residues is reduced in the presence of pyridine nitrogen atoms. Stopped-flow kinetic measurements reveal that the substitution reactions of the thioether ligand AcMet are much faster than those of the N-donor cytidine. The presence of the two pyridyl residues significantly enhances the kinetic reactivity of [Pd(bpma)]2+ as compared to that of [Pd(dien)]2+. The Pd-S(thioether) bonded species can be important intermediates in multicomponent systems, but the equilibrium state is characterised by the formation of Pd-N bonded species. The complex [Pd(bpma)NO3]NO3 has been prepared in solid state and its structure was elucidated by single crystal X-ray diffraction method.

Original languageEnglish
Pages (from-to)291-299
Number of pages9
JournalJournal of Inorganic Biochemistry
Volume94
Issue number3
DOIs
Publication statusPublished - Mar 1 2003

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Palladium
Sulfides
Thermodynamics
Ligands
Cytidine
Kinetics
Nitrogen
Uridine
X-Ray Diffraction
Substitution reactions
Single crystals
Ions
X ray diffraction
Atoms

Keywords

  • Bis(pyridin-2-ylmethyl)amine
  • Palladium(II)
  • Potentiometry
  • Stopped-flow
  • Thioether donors
  • X-ray diffraction

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry

Cite this

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title = "Thermodynamic, kinetic and structural studies on the mixed ligand complexes of palladium(II) with tridentate and monodentate ligands",
abstract = "Stability constants of the complexes formed in the reaction of [Pd(bpma)]2+ [bpma=bis(pyridin-2-ylmethyl)amine] with monodentate nitrogen and thioether ligands including uridine, MeUH, cytidine, MeC, EtGH, AcHis, AcHm, AcLys and AcMet were determined by potentiometric method. The coordination chemistry of [Pd(bpma)]2+ shows a significant similarity to that of [Pd(terpy)]2+, but it is different from [Pd(dien)]2+. The formation of hydroxo and dinuclear complexes is especially enhanced in the case of [Pd(bpma)]2+ and [Pd(terpy)]2+, but the affinity of palladium(II) ions for the coordination of thioether residues is reduced in the presence of pyridine nitrogen atoms. Stopped-flow kinetic measurements reveal that the substitution reactions of the thioether ligand AcMet are much faster than those of the N-donor cytidine. The presence of the two pyridyl residues significantly enhances the kinetic reactivity of [Pd(bpma)]2+ as compared to that of [Pd(dien)]2+. The Pd-S(thioether) bonded species can be important intermediates in multicomponent systems, but the equilibrium state is characterised by the formation of Pd-N bonded species. The complex [Pd(bpma)NO3]NO3 has been prepared in solid state and its structure was elucidated by single crystal X-ray diffraction method.",
keywords = "Bis(pyridin-2-ylmethyl)amine, Palladium(II), Potentiometry, Stopped-flow, Thioether donors, X-ray diffraction",
author = "Zolt{\'a}n Nagy and I. F{\'a}bi{\'a}n and A. B{\'e}nyei and I. S{\'o}v{\'a}g{\'o}",
year = "2003",
month = "3",
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language = "English",
volume = "94",
pages = "291--299",
journal = "Journal of Inorganic Biochemistry",
issn = "0162-0134",
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TY - JOUR

T1 - Thermodynamic, kinetic and structural studies on the mixed ligand complexes of palladium(II) with tridentate and monodentate ligands

AU - Nagy, Zoltán

AU - Fábián, I.

AU - Bényei, A.

AU - Sóvágó, I.

PY - 2003/3/1

Y1 - 2003/3/1

N2 - Stability constants of the complexes formed in the reaction of [Pd(bpma)]2+ [bpma=bis(pyridin-2-ylmethyl)amine] with monodentate nitrogen and thioether ligands including uridine, MeUH, cytidine, MeC, EtGH, AcHis, AcHm, AcLys and AcMet were determined by potentiometric method. The coordination chemistry of [Pd(bpma)]2+ shows a significant similarity to that of [Pd(terpy)]2+, but it is different from [Pd(dien)]2+. The formation of hydroxo and dinuclear complexes is especially enhanced in the case of [Pd(bpma)]2+ and [Pd(terpy)]2+, but the affinity of palladium(II) ions for the coordination of thioether residues is reduced in the presence of pyridine nitrogen atoms. Stopped-flow kinetic measurements reveal that the substitution reactions of the thioether ligand AcMet are much faster than those of the N-donor cytidine. The presence of the two pyridyl residues significantly enhances the kinetic reactivity of [Pd(bpma)]2+ as compared to that of [Pd(dien)]2+. The Pd-S(thioether) bonded species can be important intermediates in multicomponent systems, but the equilibrium state is characterised by the formation of Pd-N bonded species. The complex [Pd(bpma)NO3]NO3 has been prepared in solid state and its structure was elucidated by single crystal X-ray diffraction method.

AB - Stability constants of the complexes formed in the reaction of [Pd(bpma)]2+ [bpma=bis(pyridin-2-ylmethyl)amine] with monodentate nitrogen and thioether ligands including uridine, MeUH, cytidine, MeC, EtGH, AcHis, AcHm, AcLys and AcMet were determined by potentiometric method. The coordination chemistry of [Pd(bpma)]2+ shows a significant similarity to that of [Pd(terpy)]2+, but it is different from [Pd(dien)]2+. The formation of hydroxo and dinuclear complexes is especially enhanced in the case of [Pd(bpma)]2+ and [Pd(terpy)]2+, but the affinity of palladium(II) ions for the coordination of thioether residues is reduced in the presence of pyridine nitrogen atoms. Stopped-flow kinetic measurements reveal that the substitution reactions of the thioether ligand AcMet are much faster than those of the N-donor cytidine. The presence of the two pyridyl residues significantly enhances the kinetic reactivity of [Pd(bpma)]2+ as compared to that of [Pd(dien)]2+. The Pd-S(thioether) bonded species can be important intermediates in multicomponent systems, but the equilibrium state is characterised by the formation of Pd-N bonded species. The complex [Pd(bpma)NO3]NO3 has been prepared in solid state and its structure was elucidated by single crystal X-ray diffraction method.

KW - Bis(pyridin-2-ylmethyl)amine

KW - Palladium(II)

KW - Potentiometry

KW - Stopped-flow

KW - Thioether donors

KW - X-ray diffraction

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U2 - 10.1016/S0162-0134(03)00009-6

DO - 10.1016/S0162-0134(03)00009-6

M3 - Article

VL - 94

SP - 291

EP - 299

JO - Journal of Inorganic Biochemistry

JF - Journal of Inorganic Biochemistry

SN - 0162-0134

IS - 3

ER -