Synthesis and characterization of 1:2 metal complexes of the biheteroaromatic ligand 2-(2'-pyridyl)quinoxaline (L) and the X-ray structure of [CuL(2)](PF6)

 
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1995 (EN)

Synthesis and characterization of 1:2 metal complexes of the biheteroaromatic ligand 2-(2'-pyridyl)quinoxaline (L) and the X-ray structure of [CuL(2)](PF6) (EN)

Garoufis, A. (EN)

Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας (EL)
Garoufis, A. (EN)

The first 1:2 metal complexes of 2-(2'-pyridyl) quinoxaline (L) have been isolated. The physical and spectroscopic characteristics of the compounds [MCl(2)L(2)] (M=Ni, Cu, Cd) and [Cu(1)L(2)](PF6) are described. The structure of the copper(I) complex has been determined by X-ray diffraction methods. Crystals are orthorhombic, space group P-cnb with a=11.014(2), b=12.886(2), c=17.806(4) Angstrom, V=2527.1(9) Angstrom(3) and Z=4. Refinement of the structure gave a final R factor of 0.046 (R(w)=0.041) for 814 unique reflections having I>2.0 sigma(I). The ligand L acts as a bidentate chelate, the ligated atoms being the pyridine nitrogen and the nearest quinoxaline nitrogen. The structure of [CuL(2)](+) consists of a distorted tetrahedral arrangement around the copper(I) atom with Cu-N bond lengths of 2.023(6) and 2.059(5) Angstrom, and the N-Cu-N angle of the chelating ligand equal to 80.6(2)degrees. A monomeric trans pseudo-octahedral stereochemistry is assigned for the [MCl(2)L(2)] complexes. (EN)

crystal structures (EN)


Inorganica Chimica Acta (EN)

English

1995


Elsevier (EN)




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