Complexes of manganese(III)
and N-substituted salicylaldimines have been prepared of general formulae
Mn(sal-NR)3 and Nn(sal-NR)2X (X = Cl, Br, OAc). The
complexes show high-spin magnetic behaviour with small deviations of the
susceptibilities from the Curie law. Complexes of the type Mn(salen)X(X = Br,
I) have also been studied and these show somewhat larger deviations from Curie
behaviour. It is difficult to interpret this Curie-Weiss behaviour with
certainty, but it can be explained for the salen derivatives, in particular, in
terms of very weak antiferromagnetic interactions. The visible and
near-infrared spectra for all the complexes are assigned. A Jahn-Teller
splitting of the d-d transition is observed. Comparison of the i.r. spectra of
the M(sal)3 derivatives (M = CrIII, MnIII, and
FeIII) in the region 700-250 cm-1 has enabled assignments
of the v(M-O) modes to be made. The spectra suggest that a Jahn-Teller distortion
is operative in the Mn(sal)3 complex.