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Structure and spectroscopic characterization of the quaternary system: Copper(II), pyridine-2,6-dicarboxylate, 2,2′-bipyridyl and pyridine

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Conclusion

The x-ray structural results confirm what has been ascertained by thermodynamic and spectroscopic data in aqueous solution(7). It is evident that the addition of pyridine to the solution containing the mixed species [Cu(bipy)(pydca)(H2O)] leads to the substitution of a water molecule directly bound to copper(II) ion by a pyridine molecule. This experiment also demonstrated the presence of a water molecule in the equatorial plane of the complex.

The subsequent diffractometric study on single crystals derived from the copper(II)/bipy/pydca system revealed the existence in the solid state of [Cu2(bipy)2(pydca)2] · 4H2O. Thus the pydca dianion, instead of forming the statistically favoured mixed complex [Cu(bipy)(pydca)], gives rise to crystals containing two different copper(II) environments: [Cu(pydca)2]2− and [Cu(bipy)2]2+, linked by O-carboxylate bridges. The facility with which [Cu(bipy)(pydca)(py)] can be obtained shows that the addition of pyridine prevents the formation of polynuclear species.

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Authors and Affiliations

  1. Dipartimento di Scienze Chimiche, Università di Trieste, Piazzale Europa 1, 34127, Trieste, Italy

    Nevenka Bresciani-Pahor & Giorgio Nardin

  2. Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, 95125, Catania, Italy

    Raffaele P. Bonomo & Roberto Purrello

Authors
  1. Nevenka Bresciani-Pahor
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  2. Giorgio Nardin
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  3. Raffaele P. Bonomo
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  4. Roberto Purrello
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Bresciani-Pahor, N., Nardin, G., Bonomo, R.P. et al. Structure and spectroscopic characterization of the quaternary system: Copper(II), pyridine-2,6-dicarboxylate, 2,2′-bipyridyl and pyridine. Transition Met Chem 10, 316–318 (1985). https://doi.org/10.1007/BF00619018

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  • DOI: https://doi.org/10.1007/BF00619018

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