Extended structures of copper(II) complexes with 2-di1H-2-imidazolylmethylmalonate (DIMMAL), a versatile bis(imidazole)–bis(carboxylate) ligand: Solution studies, crystal structures and spectroscopic characterization

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• 作者：Hugo Nú ; ñ ; ez ; Juan Server-Carrió ; Emilio Escrivà ; Lucí ; a Soto ; Julia Garcí ; a-Lozano ; Amparo Sancho ; Begoñ ; a Verdejo ; Enrique Garcí ; a-Españ ; a
• 关键词：3D networks ; Self-assembly ; Imidazole– ; carboxylate ; Copper
• 刊名：Polyhedron
• 出版年：2008
• 出版时间：6 February 2008
• 年：2008
• 卷：27
• 期：2
• 页码：633-640
• 全文大小：1010 K

文摘

Copper(II) complexes of 2-di1H-2-imidazolylmethylmalonate (DIMMAL) have been studied by potentiometric methods. The data revealed that the 41125f6786eb3138""> and species are prevalent in the studied pH range. Moreover, this paper reports the synthesis, structure solution and spectroscopic characterization of two new DIMMAL containing complexes, (NH₄)₂[Cu(DIMMAL)₂] · 4H₂O (1) and [Cu(DIMMAL)(en)(H₂O)] · 5H₂O (2). The structure of compound 1 consists of centrosymmetric mononuclear anionic [Cu(DIMMAL)₂]²⁻ units, cations and lattice water molecules, in which DIMMAL²⁻ acts as a tridentate ligand through two imidazole nitrogen atoms and one oxygen atom from a carboxylate group. The crystal structure of compound 2 is built up from mononuclear neutral [Cu(DIMMAL)(en)(H₂O)] and water molecules of crystallization. In both cases the MBBs are interconnected into 3D networks by multiple H-bonding paths and aromatic–aromatic interactions, which play a determinant role in the modulation of the crystal packing. EPR spectra are indicative of an essentially d_x²−y² ground state for the copper(II) ions in both compounds (CuN₄O₂ chromophores).