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Crystal and molecular structures of eight-coordinate (CuN4O4) and six-coordinate (CuN4O2)Cu(II) complexes with 4-methyl-5-imidazole-carboxaldehyde or 1-benzyl-2-hydroxymethylimidazole, respectively spectroscopic and potentiometric studies.
Autorzy
Rok wydania
1999
Czasopismo
Numer woluminu
18
Strony
3713-3721
DOI
10.1016/S0277-5387(99)00311-3
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The synthesis and characterisation of two novel Cu(II) eight and six coordinate compounds with the bidentate ligands 4-methyl-5-imidazolecarboxaldehyde (4-Me-5-CHOIm) and 1-benzyl-2-hydroxymethylimidazole (1-Bz-2-CH2OHIm) are described. Single crystals of [Cu(4-Me-5-CHOIm)4](H2O)2(NO3)2 (1) and [Cu(1-Bz-2-CH2OHIm)4](NO3)2 (2) were used in structure determinations. The two compounds both crystallise in the monoclinic space group P1̄ with Z=2 for (1) and Z=1 for (2). The structural data for (1) indicated that Cu(II) ion is involved in a flattened tetrahedron of N(1), N(2), N(3) and N(4) atoms of imidazoles ring as well as in a more distant elongated tetrahedron of four of the z-axis oxygen atoms O(1), O(2), O(3), O(4) of aldehyde groups. The coordination scheme of the six-coordinate Cu(II) complex (2) is a slightly distorted tetragonal bipyramid and the ligands act as a monodentate and bidentate. Additionally, the coordination processes with Cu(II) were detected and characterised in solution using spectroscopic (EPR and UV–VIS) as wall as potentiometric methods.
Słowa kluczowe
Eight-coordinate copper complex, Bidentate ligands, Crystal structure, EPR spectra, Stability constants
Adres publiczny
https://doi.org/10.1016/S0277-5387(99)00311-3
Strona internetowa wydawcy
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