Abstract
A series of copper(11)
complexes has been prepared of the type CuL2Bn,
where L is an
o-hydroxy-aryl-, or naphthyl-, aldehyde, ketone, or
ester, B is water or 4-methylpyridine, and n = 0, 1,
or 2. All these complexes have a strong infrared band in the region 1600-1660 cm-l,
showing that the oxygen atoms in the chelate ring are non-equivalent ; their
magnetic moments fall in the range usual for copper(11) compounds. Equilibrium constants
determined for the addition of one molecule of 4-methylpyridine
to the anhydrous compounds in chloroform solutions fall in the range 0.5 < k
< 40 and are comparable to the constant for the addition of 4-methylpyridine to bis(acetylacetonato)copper(11)
(b 2.7). Increased stability of the adducts can be associated with the inductive
effects of ligand substituents. Ligand field spectra in the
solid state and in solution closely resemble those of corresponding bis(acetylaoetonato)copper(11) complexes and provide evidence
for square-planar structures of the anhydrous complexes and square-pyramidal
structures of the 1 : 1 adducts with 4-methylpyridine
or water. No evidence is available for the structures of 1 : 2 adduots which may be formed in solutions in 4-methylpyridine; these solutions are unstable, but the
nature of the slow reactions which occur in these solutions is not known.
Cited by
48 articles.
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