Ligand substitution reactions in trivalent lanthanum and aluminium acetylacetonates characterization of mixed ligand complexes

Neutral M[acac][3][M = La[III] or Al[Ill], Hacac = acetylacetone] reacts with pyridine-2,6-dicarboxylic acid [H2pdc], and gives [pdc]Al[acac] H[2]O and [pdc]La[acac]. 4H[2]O. Similar reaction with trichloroacetic acid yields [CCI3000]SI[acac]2. H[2]O, and [CCI3000xCH3C00]La[acac]. H[2]O, in which the ligand-substitution reaction is accompanied by decomposition of a coordinated acetylacetonate to acetate anion. Farther reaction of [CC13000]Al[acacn H2O with dichloroacetic acid produces the mixed chloroacetates [CCI3000XCHCI[2]COO]A1[acac]. 3H[2]O

Nickel [ll] and copper [ll] chelates of 1,2 diphenyl-1-oximino-2-n- [o-aminophenylaldimino] -ethanediylene and their reaction with acetylacetone and isonitrosoacetylacetone

Condensation of a-benzilmonoxime with o-phenylenediamine forms 1,2-dipherryl-1-oximino-2-N-[o-aminophenylafdimino]-ethanediyiene. Nickel [II] and copper [II] complexes of this imine-oxime are characterized. Linkage-isomerization of N- and O-oximato is explored. Phenyl side groups hinder impact of surroundings. In the acetate derivatives, the imine-oxime is deprotonated, and mass spectra exhibit base lines of dimers. O-oximato holds nickel [ln acetate dieter, while acetate links that of copper [Il]. Infrared spectra, magnetic and electrochemical behaviors support the dimerization- b-diketone such as acetyl-acetone or isonitrosoacetylacetone substitutes the acetate group. Replacement of the bridging acetate of the copper [II] chelate is accompanied by condensation between the carbonyl of diketonate and the amino group. Correlations between infrared frequencies and reduction potentials are used to identify the redox species. Unlike Ni[II]-chelates, -electron delocalization are expected within the ligand of the Cu[II]-chelates