A novel dinuclear manganese(II) compound incorporating two bis(imidazolyl) based ligands with single mu(2)-eta(1):eta(1)-carboxylato bridges. Molecular and crystal structure and magnetic properties of [Mn2Cl(BIP)(HBIMAM)(H2O)(5)]Cl-3 center dot 4H(2)O (BIP=3,3-di (2-1H-2-imidazolyl)propanoate; BIMAM = N-methyldi (1H-2-imidazolyl)methanamine)

作者：Escriva Emilio^*; Lezama Luis; Soto Lucia; Sancho Amparo; Folgado Jose Vicente; Ramirez de Arellano Carmen

来源：Polyhedron, 2014, 68: 319-323.

DOI：10.1016/j.poly.2013.11.008

• Mn(II) dinuclear compounds
• mu(2)-eta(1):eta(1) Carboxylate bridge
• Aromatic aromatic interactions
• Antiferromagnetism
• Magneto-structural correlations

This paper reports the synthesis, X-ray structure and magnetic characterization of [Mn2Cl(BIP) (HBIMAM)(H2O)(5)]Cl-3 center dot 4H(2)O 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 mu(2)-eta(1):eta(1) carboxylate group (from the propionate arm of the BIP ligand) acting in an anti-anti coordination bridging mode, with an intramolecular Mn center dot center dot center dot Mn distance of 6.47 angstrom. 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 it-stacked dinuclear units, roughly running along the [100] direction. Magnetic susceptibility measurements in the range 2-300 K show weak antiferromagnetic exchange interactions which were analysed by means of the isotropic S-1 = S-2= 5/2 spin-coupled dimer model (H) over cap = -2J ((S) over cap (1)center dot(S) over cap (2)). Finally, the observed magnetic behavior (2J = -0.38(1) cm(-1)) is compared with that observed in related manganese(II) compounds with single [Mn(mu(2)-eta(1):eta(1)-carboxylato)Mn] core.

• 出版日期2014-1-28