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Structure and Properties of Dinuclear Manganese(III) Complexes with Pentaanionic Pentadentate Ligands Including Alkoxo, Amido, and Phenoxo Donors

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posted on 20.08.2007, 00:00 by Liliana Stoicescu, Aurélie Jeanson, Carine Duhayon, Ana Tesouro-Vallina, Athanassios K. Boudalis, Jean-Pierre Costes, Jean-Pierre Tuchagues
Doubly bridged μ-alkoxo-μ-X (X = pyrazolato or acetato) dinuclear MnIII complexes of 2-hydroxy-N-{2-hydroxy-3-[(2-hydroxybenzoyl)amino]propyl}benzamide) (H5L1) and 2-hydroxy-N-{2-hydroxy-4-[(2-hydroxybenzoyl)amino]butyl}benzamide (H5L2), [Mn2(L)(pz)(MeOH)4xMeOH (1, L = L1, x = 0.5; 2, L = L2, x = 0; Hpz = pyrazole) and [Mn2(L1)(OAc)(MeOH)4] (3), have been prepared, and their structure and magnetic properties have been studied. The X-ray diffraction analysis of 1 (C24.5H34Mn2N4O9.5, triclinic, P1̄, a = 12.2050(7) Å, b = 12.7360(8) Å, c = 19.2780(10) Å, α = 99.735(5)°, β = 96.003(4)°, γ = 101.221(5)°, V = 2867.6(3) Å3, Z = 4), 2 (C25H34Mn2N4O9, triclinic, P1̄, a = 9.4560(5) Å, b = 11.0112(5) Å, c = 13.8831(6) Å, α = 90.821(4)°, β = 92.597(4)°, γ = 93.403(4)°, V = 1441.29(12) Å3, Z = 2), and 3 (C23H32Mn2N2O11, triclinic, P1̄, a = 10.511(5) Å, b = 11.713(5) Å, c = 13.135(5) Å, α = 64.401(5)°, β = 74.000(5)°, γ = 66.774(5)°, V = 1329.3(10) Å3, Z = 2) revealed that all complexes consist of dinuclear units which are further extended into 1D (1 and 3) and 2D (2) supramolecular networks via hydrogen-bonding interactions. Magnetic susceptibility data evidence antiferromagnetic interactions for all three complexes:  J = −3.6 cm-1, D ≈ 0 cm-1, g = 1.93 (1); J = −2.7 cm-1, D = 0.8 cm-1, g = 1.93 (2); J = −4.9 cm-1, D = 3.8 cm-1, g = 1.95 (3).

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