Multidentate ligands for the synthesis of multi-metallic complexes

Synthesis, characterization and anti-microbial studies of mixed D/F trinuclear complexes using N₄O₃ potentially heptadentate Schiff-Base ligand

“…The disappearance of band for (OH) vibration in the spectra of the complexes indicates the coordination of phenolic oxygen with metal ions (Mustapha et al, 2008).…”

“…The yellow powdered solid was recrystallized by dissolving in ethanol/chloroform in the ratio 7:3 and dried on water bath. Yield 77.7% (Mustapha et al, 2008;Kanesato et al, 2000;Richarson et al, 1968) (Kahn et al, 1999). Yield 62% (Mustapha et al, 2011;Mustapha et al, 2008;Simon et al, 2003;Mustapha et al, 2009 andKahn et al, 1999) (Mustapha et al, 2011;Mustapha et al, 2008;Simon et al, 2003;Mustapha et al, 2009 andKahn et al, 1999) Insoluble Insoluble Insoluble Soluble Soluble Soluble Soluble Soluble Soluble Soluble Soluble Soluble Soluble Soluble Soluble Soluble Soluble Soluble Soluble Soluble Soluble Insoluble Insoluble Insoluble The Electronic spectra The spectrum of the free ligand shows a band at λ max 380nm and 420nm which is attributed to (π π*) and (n π) transition.…”

“…This is unconnected to the significance of the compounds in topics such as, the nature of orbital interaction, electron transfer in redox reaction processes, and biological electron transport (Bailey et al, 1995). The ability of Schiff base ligands to donate lone pairs of electrons into the d or f orbital of transition metal ion makes them important models in designing multinuclear complexes (Mustapha et al, 2008). Among the large number of ligand frameworks studied, Schiff base derivatives of the TREN moiety [N(CH 2 CH 2 NH 2 ) 3 ] were found to be very effective in the design of multinuclear compounds, most especially those derived from the reaction of salicylaldehyde with TREN (Mustapha et al, 2011;Mustapha Simon et al, 2003 andMustapha et 2009).…”

Metal complexes as potential ligands: The deprotonation of aminephenolate metal complexes

“…We have recently turned our attention to the use of multidentate ligands as a way of constructing multimetallic complexes [1][2][3]. The synthetic protocols employed to produce these compounds routinely use non-coordinating bases such as triethylamine to deprotonate the ligand during the reaction [3,4].…”

“…H6TrenSal)Ni}K-l-EtOH]2 are not included as there is greater uncertainty regarding the metrical data.Fig. 4.…”