Speciation studies of mono- and binuclear Pd(II) complexes involving mixed nitrogen–sulfur donor ligand and 4,4′-bipiperidine as a linker

Abstract

Pd(MME)Cl₂ complex, where MME = methionine methyl ester, was synthesized and characterized by elemental analysis and spectroscopic techniques. [Pd(MME)(H₂O)₂]²⁺ interacts with some DNA constituents giving 1 : 1 and 1 : 2 complexes. The binuclear complexes having 4,4′-bipiperidine as a linker and involving [Pd(MME)(H₂O)₂]²⁺ and DNA constituents were investigated. The results show formation of [(H₂O)(MME)Pd(Bip)Pd(MME)(H₂O)]⁴⁺. Inosine, uracil, and thymine interact with the previously mentioned complex by substitution of the two coordinated water molecules. Formation constants of all possible mono- and binuclear complexes were determined and their speciation diagrams were evaluated.

Electronic spectra of [Pd(MME) (H₂O)₂]²⁺ and its uracil complexes

Speciation of mono- and binuclear Pd(II) complexes involving mixed nitrogen–sulfur donor ligand is investigated; 4,4′-bipiperidine is used as a linker.

Keywords:

• Palladium(II) complexes
• Methionine methyl ester
• 4,4′-bipiperidine
• DNA constituents
• Binuclear complexes
• Equilibrium constants

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes

Dedicated to Prof. Rudi van Eldik on the occasion of his 70th birthday.