|
Abstract
|
Three different categories Schiff bases and their binuclear nickel complexes
synthesized using the sonochemical and the reflux distillation methods. These
compounds were characterized by various methods including 1H NMR, 13C NMR,
IR, Mass, UV-Vis, TGA, SEM, magnetometery, conductometery, and elemental
analysis.
The first category consists of three macrocyclic fourdendate (N4) Schiff base
ligands were derived from condensation of some dianiline compounds including
4,4'-di-amino diphenyl sulfone (DDS), 4,4'-oxy-di-aniline (ODA) and 4,4'-
methylene bis-benzylamine (MDA) with ortho-phthalaldehyde (OPA). The
second category consists of four six dendate (N4O2) Schiff base ligands, (H2L4-
H2L7) which were prepared from the two stages consecutive reaction of 9-Hexyl-
9-H-carbazol-3,6-dicarbaldehyde with 2-amino-3,5-diboromobenzaldehyde and
some derivatives of 2-hydroxyaminophenol. The third category including of some
six dentate (N4O2) Schiff base ligands, (H2L8-H2L19), which are the products of
reaction between dianilines (DDS, ODA and MDA) and 2-amino-3,5-
diboromobenzaldehyde and various derivatives 2-hydroxybenzaldehyde. The
binuclear nickel complexes [Ni2LnCl4] and [Ni2LnCl2], were synthesized using an
ultrasonic or reflux distillation methods.
Based on elemental, conductance spectral studies and magnetic moment
measurements four-coordinated geometry was assigned for these complexes. The
ligands L1-L3 act as fourdentate and coordinates through nitrogen atom of
azomethine group. also ligands H2Ln (n = 4-19) act as sixdentate and coordinates
through nitrogen atom of azomethine and oxygen atoms of the hydroxyl groups.
Further more Nanoscale particles of nickel oxide were produced from the nano
nickel complexes using the thermal decomposition method and analyzed using
FT-IR, FE-SEM and X-ray powder diffraction (XRD) methods, which indicated
close accordance to the standard pattern of NiO nanoparticles and showed an
acceptable size in the nanorange (54-32 nm).
Further more
|