Magnetostructural correlations and catecholase-like activities of µ-alkoxo-bridged dinuclear copper(II) complexes with 1-diethylaminopropan-2-ol, N3-, NCO- and NO2- ligands
Abstract
Three new µ-alkoxo-bridged dinuclear copper(II)
complexes with µ-1-diethylaminopropan-2-olate,
[Cu
2
{µ-Et
2
NCH
2
CH(Me)O
}
2
X
2
]
(X = N
3
-
1,
NCO
-
2 or NO
2
-
3), have
been prepared and characterized by single-crystal X-ray diffraction
analyses. The copper atoms have distorted square-planar environments
bridged by two oxygen atoms of alkoxo groups. Magnetic susceptibility
measurements in the temperature range 5–300 K indicated
significant antiferromagnetic coupling for 3 and ferromagnetic coupling
for 1 and 2 between the copper(II) atoms. The best
least-squares-fitted coupling constants (2J) for 1, 2 and 3
were 81, 25 and -42 cm
-1
respectively. By
comparison to the known complex
[Cu
2
{µ-Et
2
NCH
2
CH(Me)O
}
2
(NCS)
2
] 4
(2J = -86.0 cm
-1
), a
linear correlation between the magnetic coupling constants and the mean
Cu–O–Cu angle (ϕ) with a crossover point at ϕ
97.3° from antiferromagnetic to ferromagnetic coupling is obtained.
The catecholase activity of these copper(II) complexes for
the oxidation of 3,5-di-tert-butylcatechol by O
2
was
studied and shown to be in the order
1 < 2 < 3.
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