STRUCTURES OF Ni(II), Pd(II) AND Cu(II) COMPLEXES WITH 1,2-BIS(5,5,5-TRIFLUORO-4-OXOPENT-2-EN-2-AMINO)BENZENE
D. L. Chizhov, E. F. Khmara, P. A. Slepukhin, V. I. Filyakova, V. N. Charushin
Keywords: Ni(II), Pd(II), Cu(II) complexes, 1,2-bis(5,5,5-trifluoro-4-oxopent-2-en-2-amino)benzene, synthesis, X-ray crystallography
Pages: 301-308
Abstract
A new fluorine-containing tetradentate ligand 1,2-bis(5,5,5-trifluoro-4-oxopent-2-en-2-amino)benzene and its complexes with Ni(II), Pd(II) and Cu(II) are characterized by single crystal X-ray diffraction. It is found that the enaminoketone fragments of the ligand are identical in bond lengths and angles; they are almost planar, and make the angles of 51.3° to the plane of the benzene ring. The structures of Ni(II), Pd(II), and Cu(II) complexes are similar and have a saddle-shape configuration. The metal ions have square planar coordination and are located almost in the center of the N2O2 square. The average M-N bond lengths are longer than M-О ones by 0.014 Å and 0.034 Å for the Ni(II) and Cu(II) complexes respectively, while in the Pd(II) complex, M-О is longer than M-N by 0.029 Å. The average chelate angles N-M-O in the complexes are: N-Ni-O 95.12°; N-Pd-O 95.68°; N-Cu-O 93.88°.
|
