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• W2063090283 abstract "This paper reports the synthesis, structure solution, and magnetic characterization of four new DIMMAL-containing compounds (H2DIMMAL = 2-di1H-2-imidazolylmethylmalonic acid), H2DIMMAL·H2O (1), Na2(DIMMAL)·5H2O (2), [Cu(HDIMMAL)2] (3), and [Cu2(DIMMAL)2(H2O)2]·2H2O (4). Compound 1, containing two carboxylates and two protonated imidazole rings, adopts the dizwitterion configuration. These monohydrate MBBs pack together into a 3D array driven, as in the other three cases herein reported, by a combination of multiple-path H-bonds and aromatic−aromatic interactions. Compound 2 consists of centrosymmetric Na+ tetramers in which four NaO6 distorted octahedra are interconnected by carboxylate and water bridges. Compound 3 consists of mononuclear [Cu(HDIMMAL)2] units in which HDIMMAL- acts as a tridentate ligand through two imidazole N atoms and the deprotonated O from a carboxylate. Compound 4 consists of centrosymmetric cyclic dinuclear [Cu2(DIMMAL)2(H2O)2]·2H2O units involving propionate-arm bridges. The building-block units described above, in each case, are interconnected into 3D networks by multiple H-bonding paths and aromatic−aromatic interactions. The EPR spectra are indicative of an essentially dx2-y2 ground state for the copper(II) ions in 3 and 4 (CuN4O2 and CuN2O2O‘ chromophores, respectively). Magnetic susceptibility measurements in the range of 1.8−200 K for compound 4 show weak antiferromagnetic exchange between the copper(II) ions (2J = −1.6(1) cm-1). The effectiveness of the propionate-arm bridges, involving C−C σ bonds, in propagating magnetic exchange between the copper(II) ions is discussed." @default.
• W2063090283 created "2016-06-24" @default.
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• W2063090283 date "2005-06-01" @default.
• W2063090283 modified "2023-10-18" @default.
• W2063090283 title "Structural, Magnetic, and Spectroscopic Comparative Studies on Four New Derivatives of DIMMAL (2-Di1<i>H</i>-2-imidazolylmethylmalonate): A Novel Generator of Multidimensional Networks" @default.
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• W2063090283 doi "https://doi.org/10.1021/ic048234x" @default.
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