Crystal structures of copper(II) complexes with methyliminodiacetate ions and 1,10-phenanthroline or imidazole [Cu(Phen)H2O][Cu(Mida)2]·2H2O and [Cu(Mida)Im] |
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Authors: | M. Zabel A. L. Poznyak V. I. Pawlowski |
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Affiliation: | (1) Institute of Inorganic Chemistry, University of Regensburg, Germany;(2) Institute of Molecular and Atomic Physics, National Academy of Sciences, Minsk, Belarus |
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Abstract: | Methyliminodiacetic acid (H2Mida) and imidazole react with copper(II) to form crystals of the square pyramidal complex [Cu(Mida)Im]. One N and two O atoms of the Mida ligand (Cu-N 2.010(1) Å, Cu-O 1.955(1) Å, and 1.978(1) Å) and the imidazole N atom (1.950(1) Å) lie at the base of the pyramid. The carboxyl O atom of the neighboring complex lies at the apical position (2.411(1) Å); in this way the individual complexes are linked into infinite zigzag chains. Substitution of imidazole by 1,10-phenanthroline gave [Cu2(Mida)2(Phen)H2O]·2H2O crystals with two nonequivalent centrosymmetric octahedral anions [Cu(Mida)2]2? of face type (Cu-N 2.023 Å and 2.028(2) Å, Cu-Oax 2.579 Å and 2.530(2) Å, Cu-Obas 1.952 Å and 1.936(2) Å). The anions serve as bridges in chains between the [Cu(Phen)H2O]2+ cation fragments to which they are bonded by their axial carboxyl groups. The Cu atom of the cation has a [4+1] environment (with the H2O molecule lying on the axis of the pyramid, and with two N atoms of the ligand and two O atoms of the anions lying at the base). |
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Keywords: | crystal structure (methyliminodiacetato)copper(II) complexes |
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