6533b822fe1ef96bd127d5a3

RESEARCH PRODUCT

Stabilities and coordination modes of histidine in copper(II) mixed-ligand complexes with ethylenediamine, diethylenetriamine or N,N,N′,N″,N″-pentamethyldiethylenetriamine in aqueous solution

Katarzyna BoguszBarbara KurzakAnna KameckaJulia Jezierska

subject

Aqueous solutionChemistryInorganic chemistrychemistry.chemical_elementEthylenediamineCopperSquare pyramidal molecular geometrylaw.inventionInorganic ChemistryTrigonal bipyramidal molecular geometrychemistry.chemical_compoundCrystallographylawDiethylenetriamineMaterials ChemistryPhysical and Theoretical ChemistryElectron paramagnetic resonanceTernary operation

description

Abstract Solution equilibrium studies on the Cu(II)–polyamine–methionine ternary systems (polyamine: ethylenediamine (en), diethylenetriamine (dien), N,N,N′,N′′,N′′-pentamethyldiethylenetriamine (Me5dien)) have been performed by pH-potentiometry, UV–Vis spectrophotometry and EPR methods. The obtained results suggest the formation of the mixed-ligand complexes with [Cu(A)(Met)]+ stoichiometry in all studied systems. Our spectroscopic results indicate the tetragonal geometry for [Cu(en)(Met)]+, the geometry slightly deviated from square pyramidal for [Cu(dien)(Met)]+ and strongly deviated from square pyramidal towards trigonal bipyramidal for the [Cu(Me5dien)(Met)]+ species. The coordination modes in these mixed-ligand complexes are discussed.

yearjournalcountryeditionlanguage
2008-09-01Polyhedron
https://doi.org/10.1016/j.poly.2008.05.029