A family of mixed-valent tridecanuclear clusters, and their magnetostructural correlation

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• 作者：Christos Lampropoulos ; Muralee Murugesu ; Khalil A. Abboud ; George Christou
• 关键词：Manganese ; 1 ; 8-Naphthalenedicarboxylate ; Polynuclear metal complexes ; Magnetic properties ; Magnetostructural correlation
• 刊名：Polyhedron
• 出版年：2007
• 出版时间：15 June 2007
• 年：2007
• 卷：26
• 期：9-11
• 页码：2129-2134
• 全文大小：588 K

文摘

Three tridecanuclear Mn complexes [Mn₁₃O₈(OH)₆(ndc)₆] · 8DMF · H₂O (1), [Mn₁₃O₈(EtO)_5.5(OH)_0.5(ndc)₆] · 6MeCN · 2H₂O (2), and [Mn₁₃O₈(EtO)₆(O₂CPh)₁₂] · 7H₂O (3) (ndc²⁻ = 1,8-naphthalenedicarboxylate) are reported. Complexes 1–3 possess a central core comprised of three layers: The middle layer is a central Mn^IV atom surrounded by a planar ring of six Mn^II atoms, and above and below this are two Mn^III₃ triangular units. Complexes 1 and 2 represent the first use of ndc²⁻ in manganese chemistry. All three complexes are mixed-valent . Complex 1 was found to have a ground state spin of S = 9/2, whereas 2 and 3 have S = 11/2 despite the nearly isostructural core of the three compounds. A magnetostructural correlation has shown that small structural perturbations can considerably change the magnetic properties of these clusters.