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Inne
Coordination properties of 1-allyl-2-methylimidazole relative to some metal ions in the solid state and aqueous solution.
Autorzy
Rok wydania
2001
Czasopismo
Numer woluminu
20
Strony
3307-3313
DOI
10.1016/S0277-5387(01)00948-2
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Cobalt(II) and copper(II) complexes with 1-allyl-2-methylimidazole (L), of general formula [ML2(NO3)2], have been prepared in the solid state. The compounds were characterised by structural, spectroscopic and magnetic measurements. The metal ions in both six coordinate complexes are surrounded by two nitrogen atoms of the imidazole rings and four oxygen atoms of the chelating nitrato group (the CoN2O4 and CuN2O4 chromophores). The structure of both chromophores is described by a very distorted tetragonal bipyramid. The formation of successive complexes of the azole with Co2+, Ni2+, Cu2+, Zn2+ and Cd2+ in aqueous solution was followed potentiometrically. An irregularity in the Kn constants of successive Co2+ and Zn2+ complexes suggests a change in the coordination sphere of the central ions from octahedral to tetrahedral. With the Co2+–1-allyl-2-methylimidazole system, the change has been proven by inspection of the visible absorption spectra. Cobalt(II) and copper(II) complexes with 1-allyl-2-methylimidazole (L), of general formula [ML2(NO3)2], have been prepared and characterised by structural, spectroscopic and magnetic measurements. The structure of both chromophores (CoN2O4 and CuN2O4) is described by a very distorted tetragonal bipyramid. The formation of successive complexes of the azole with Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) in aqueous solution was followed potentiometrically. An irregularity in the Kn constants of successive Co(II) and Zn(II) complexes suggests a change in the coordination sphere of the central ions from octahedral to tetrahedral. With the Co(II)–1-allyl-2-methylimidazole system, the change has been proven by inspection of the visible absorption spectra. In the case of the other studied metal ion, the complexation proceeded according to Bjerrum's model with retention of the six coordinate geometry of the central ion.
Słowa kluczowe
Imidazole derivatives, Transition metal complexes, Crystal structures, Spectra, Stability constant
Adres publiczny
https://doi.org/10.1016/S0277-5387(01)00948-2
Strona internetowa wydawcy
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