A number of copper(II)
complexes of anils of pyridine-2-carbaldehyde with chloride, bromide, nitrate
and perchlorate as anions have been prepared. Spectral and conductivity studies
suggest that the compounds may be compared with the complexes of ligands such
as bipyridyl and Schiff bases derived from pyridine-2-carbaldehyde and
aliphatic diamines. Physicochemical evidence is given for the stereochemistry
of the compounds. Mono-, bis- and tris-chelated compounds have been obtained.
Complexes of the type CuLX2 (where X = Cl
and Br) appear to be polymers with a five- or six-coordinate copper(II)
stereochemistry. Evidence is presented for the existence of the five-coordinate
cation [CuL2X]+ (where X = Br and NO3) in the
solid compounds of type CuL2X2. In solution in
nitromethane and methanol interaction occurs with the solvent. The bis- and
tris- perchlorato compounds CuL2(ClO4)2 and
CuL3(ClO4)2,2H2O are described and
possible structures suggested by comparison with analogous compounds.
Synthesis, Antibacterial and Antifungal Investigations of Mn (Ii) Complexes with Schiff Bases Derived From 2 – Hydroxy – 1 – Naphthaldehyde and Some Aliphatic Diamines