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Spectral analysis and crystal structure of a new mononuclear copper(II) complex of 3-aminopyridine

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Abstract

A new Cu(II)-complex of 3-aminopyridine, [CuCl(3-AP)4][Cu(3-AP)4(H2O)]Cl3 · 2H2O (1), containing two contrasting complex cations has been synthesized and structurally characterized by single crystal X-ray diffraction and solid-state linear-dichroic infrared (IR-LD) spectral analysis. In both cations four 3-AP molecules coordinate the Cu(II) atom in a monodentate fashion through their endocyclic (Npy) nitrogens, thereby generating a square-planar coordination geometry for the CuN4 chromophor. Perpendicular to the N4 plane, the metal ion is coordinated by a chloride anion in the first cation and a water ligand in the second cation. One of three additional water molecules of crystallization occupies the vacant octahedral site of the second cation and participates in a weak Cu···OH2 interaction. An IR-LD spectral analysis of the samples, oriented as a suspension in a nematic liquid crystal confirmed the crystallographic data and the retention of the pyridine ring aromatic character after coordination. The presented results are additionally supported by UV, 1H-NMR, EPR and MS analysis and by thermogravimetric and calorimetric data.

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Authors and Affiliations

  1. Department of Chemistry, University of Sofia, 1164, Sofia, Bulgaria

    Bojidarka B. Koleva, Elena N. Trendafilova & Michail G. Arnaudov

  2. Department of Chemistry, Ruhr University Bochum, 44780, Bochum, Germany

    William S. Sheldrick & Heike Mayer-Figge

Authors
  1. Bojidarka B. Koleva
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  2. Elena N. Trendafilova
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  3. Michail G. Arnaudov
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  4. William S. Sheldrick
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  5. Heike Mayer-Figge
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Correspondence to Bojidarka B. Koleva.

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Koleva, B.B., Trendafilova, E.N., Arnaudov, M.G. et al. Spectral analysis and crystal structure of a new mononuclear copper(II) complex of 3-aminopyridine. Transition Met Chem 31, 866–873 (2006). https://doi.org/10.1007/s11243-006-0078-1

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  • DOI: https://doi.org/10.1007/s11243-006-0078-1

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