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Synthesis, characterisation and reactivity of mono, bi and
trinuclear copper(II) complexes with tridentate Schiff bases: effect
of substituents and reaction conditions.
Luca Rigamontia, Alessandro Pasinia, Alessandra Fornib, Antonio Cintic
a
Dipartimento di Chimica Inorganica, Metallorganica e Analitica, Università degli
Studi di Milano, via Venezian 21, 20133 Milano, Italy; b CNR-ISTM, via Golgi 19,
20133, Milano, Italy; c Dipartimento di Chimica, via Elce di Sotto 8, 06100,
Perugia, Italy. ([email protected])
The monocondensation of salicylaldehyde to aliphatic primary diamines can be
achieved only by template syntheses with the use of copper(II). This can give rise
to mono, bi and trinuclear species with interesting magnetic features.
Mononuclear compounds 1 are easily prepared following Costes et al [1] in the
presence of pyridine, except with 5-methoxy
salicylaldehyde and 1,3-diaminopropane, that
+
(CH2)n
gives instead a binuclear compound (type 2).
N
NH2
(ClO4)Cu
Binuclear compounds 2 are obtained following
N
G
O
Mandal and Nag’s high dilution method [2] with
1
G = H and OMe; with 5-nitrosalicylaldehyde,
G = H, NO2, OMe; n = 2, 3
under the same reaction conditions, trinuclear
not with G = OMe and n = 3
complexes 3 are formed. With G = H, a small
excess of base leads to the trinuclear compounds 3.
O
G
OH
G
(CH2)n
+ Cu(ClO4)2 + H2N
NH2
2+
(CH2)n
MeOH, reflux
(CH2)n
N
2+
NH2
O
O
G (ClO4)2
O
G = H, OMe; n = 2, 3
2
O
3
N
Cu
(CH2)n
(ClO4)2
H2N
OH
H2N Cu
Cu
H2N
N
(CH2)n
NH2
Cu
G
Cu
G
N
O
(CH2)n N
G
G = H, NO2; n = 2, 3
The reactivity towards acids and bases, X-ray structures and magnetic properties of
representative compounds will be presented.
References
[1] Costes, J-P. et al Inorg. Chim. Acta 1998, 274, 73.
[2] Mandal, S.K.; Nag, K. J. Chem. Soc., Dalton Trans. 1984, 2839.

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