A novel dinuclear manganese(II) compound incorporating two bis(imidazolyl) based ligands with single 渭₂-畏¹:畏¹-carboxylato bridges. Molecular and crystal structure and magnetic properties of [Mn₂Cl(BIP)(HBIMAM)(H₂O)₅]Cl₃路4H₂O (BIP = 3,3-di(2-1H-2-im

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• 作者：Emilio Escriv脿 ; Luis Lezama ; Luc铆a Soto ; Amparo Sancho ; Jos茅-Vicente Folgado ; Carmen Ram铆rez de Arellano
• 关键词：Mn(II) dinuclear compounds ; 渭2-畏1 ; 畏1 Carboxylate bridge ; Aromatic aromatic interactions ; Antiferromagnetism ; Magneto-structural correlations
• 刊名：Polyhedron
• 出版年：28 January, 2014
• 年：2014
• 卷：68
• 期：Complete
• 页码：319-323
• 全文大小：1470 K

文摘

This paper reports the synthesis, X-ray structure and magnetic characterization of [Mn₂Cl(BIP) (HBIMAM)(H₂O)₅]Cl₃路4H₂O a novel dinuclear manganese(II) incorporating two related bis(imidazolyl)-based ligands, BIP (3,3-di(2-1H-2-imidazolyl)propanoate) and BIMAM (N-methyldi(1H-2-imidazolyl)methanamine). The metal atoms in the dinuclear entity are bridged by a 渭₂-畏¹:畏¹ carboxylate group (from the propionate arm of the BIP ligand) acting in an anti-anti coordination bridging mode, with an intramolecular Mn鈰疢n distance of 6.47 脜. The coordination around the Mn(II) ions shows a distorted octahedral geometry for both MnClN₂O₃ and MnN₂O₄ chromophores. Between the imidazole rings of neighbouring dinuclear units there significant aromatic-aromatic interactions. The propagation of these interactions generates chains of 蟺-stacked dinuclear units, roughly running along the [1 0 0] direction. Magnetic susceptibility measurements in the range 2-300 K show weak antiferromagnetic exchange interactions which were analysed by means of the isotropic S₁ = S₂ = 5/2 spin-coupled dimer model . Finally, the observed magnetic behavior (2J = 鈭?.38(1) cm^鈭?) is compared with that observed in related manganese(II) compounds with single [Mn(渭₂-畏¹:畏¹-carboxylato)Mn] core.