Naslov
Trans-Bis(dimethyl sulfoxide-kappaO)bis(3-oxo-3, 4-dihydroquinoxaline-2-carboxylato-kappa^2N^1, O^2)copper(II)

Autori
Popović, Zora ; Pavlović, Gordana ; Kukovec, Boris-Marko

Izvornik
Acta Crystallographica. Section C, Crystal Structure Communications (0108-2701) C63 (2007), 5; M181-m183

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
crystal structure; copper(II); 3-hydroxyquinoxaline-2-carboxylic acid; DMSO

Sažetak
The title compound, [Cu(C9H5N2O3)2(C2H6OS)2], consists of octahedrally coordinated Cu(II) ions, with the 3-oxo-3, 4-dihydroquinoxaline-2-carboxylate ligands acting in a bidentate manner [Cu-O = 1.9116 (14) Å and Cu-N = 2.1191 (16) Å ] and a dimethyl sulfoxide (DMSO) molecule coordinated axially via the O atom [Cu-O = 2.336 (5) and 2.418 (7) Å for the major and minor disorder components, respectively]. The whole DMSO molecule exhibits positional disorder [0.62 (1):0.38 (1)]. The octahedron around the CuII atom, which lies on an inversion centre, is elongated in the axial direction, exhibiting a Jahn-Teller effect. The ligand exhibits tautomerization by H-atom transfer from the hydroxyl group at position 3 to the N atom at position 4 of the quinoxaline ring of the ligand. The complex molecules are linked through an intermolecular N-H...O hydrogen bond [N...O = 2.838 (2) Å ] formed between the quinoxaline NH group and a carboxylate O atom, and by a weak intermolecular C-H...O hydrogen bond [3.392 (11) Å ] formed between a carboxylate O atom and a methyl C atom of the DMSO ligand. There is a weak intramolecular C-H...O hydrogen bond [3.065 (3) Å ] formed between a benzene CH group and a carboxylate O atom.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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