Synthesis and spectroscopic studies on ternary bis-Schiff-base complexes having oxygen and/or nitrogen donors
Abouhussien, Azza;
Abstract
The bis-Schiff-base of N2O2 donor dibasic ligand, H2L, is synthesized by the reaction of
4,6-diacetylresorcinol with ethylamine in molar 1 : 2 ratio. The ligand is characterized using
IR, UV-Vis, 1HNMR and mass spectroscopy. The 1HNMR spectrum of the ligand
shows the presence of phenolic coordinating groups. Several new mixed ligand complexes
of the Schiff-base ligand (H2L) and (L0) where (L0)=deprotonated 8-hydroxyquinoline
(8-HQ), 2,20-bipyridine (2,20-Biby) and 1,10-phenanthroline (1,10-Phen) with different metal
ions such as Co(II), Ni(II), Cu(II) and UO2(VI) are synthesized. Elemental analyses, infrared,
ultraviolet-visible, electron spin resonance and thermal analysis, as well as conductivity and
magnetic susceptibility measurements, are used to elucidate the structures of the newly prepared
metal complexes. The complexes are isolated as binuclear and confirmed by ESR spectra.
Thermal degradation studies for some complexes show that the final product is the metal
oxide. In addition, thermal gravimetric analysis (TGA) is used as a tool to detect that the
water molecules associated with the complexes are either coordinated or crystalline. An octahedral
geometry is suggested for the Co(II), Ni(II), Cu(II) (for 2,20-Biby and 1,10-Phen), and
UO2(VI) complexes, square planar for Cu(II) (for 8-HQ) complexes and their calculated field
parameters agree with their proposed geometry.
4,6-diacetylresorcinol with ethylamine in molar 1 : 2 ratio. The ligand is characterized using
IR, UV-Vis, 1HNMR and mass spectroscopy. The 1HNMR spectrum of the ligand
shows the presence of phenolic coordinating groups. Several new mixed ligand complexes
of the Schiff-base ligand (H2L) and (L0) where (L0)=deprotonated 8-hydroxyquinoline
(8-HQ), 2,20-bipyridine (2,20-Biby) and 1,10-phenanthroline (1,10-Phen) with different metal
ions such as Co(II), Ni(II), Cu(II) and UO2(VI) are synthesized. Elemental analyses, infrared,
ultraviolet-visible, electron spin resonance and thermal analysis, as well as conductivity and
magnetic susceptibility measurements, are used to elucidate the structures of the newly prepared
metal complexes. The complexes are isolated as binuclear and confirmed by ESR spectra.
Thermal degradation studies for some complexes show that the final product is the metal
oxide. In addition, thermal gravimetric analysis (TGA) is used as a tool to detect that the
water molecules associated with the complexes are either coordinated or crystalline. An octahedral
geometry is suggested for the Co(II), Ni(II), Cu(II) (for 2,20-Biby and 1,10-Phen), and
UO2(VI) complexes, square planar for Cu(II) (for 8-HQ) complexes and their calculated field
parameters agree with their proposed geometry.
Other data
Title | Synthesis and spectroscopic studies on ternary bis-Schiff-base complexes having oxygen and/or nitrogen donors | Authors | Abouhussien, Azza | Keywords | bis-Schiff-base complexes; ESR; 1HNMR; UV-vis; Thermal analysis 1. Introduction | Issue Date | Jan-2006 | Journal | Journal of Coordination Chemistry Vol. 59, No. 2, January 2006, 157–176 | Series/Report no. | Journal of Coordination Chemistry Vol. 59, No. 2, January 2006, 157–176; |
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