Crystal structure and spectroscopic properties of polymeric adducts of the tetra-μ-haloaspirinate-dicopper(II)

Abstract

Eight new copper(II) complexes with halo-aspirinate anions have been synthesized: [Cu₂(Fasp)₄(MeCN)₂] · 2MeCN (1), [Cu₂(Clasp)₄(MeCN)₂] · 2MeCN (2), [Cu₂(Brasp)₄(MeCN)₂] · 2MeCN (3), {[Cu₂(Fasp)₄(Pyrz)] · 2MeCN} _n (4), {[Cu₂(Clasp)₄(Pyrz)] · 2MeCN} _n (5), [Cu₂(Brasp)₄(Pyrz)] _n (6), [Cu₂(Clasp)₄(4,4′-Bipy)] _n (7), and [Cu₂(Brasp)₄(4,4′-Bipy)] _n (8) (Fasp: fluor-aspirinate; Clasp: chloro-aspirinate; Brasp: bromo-aspirinate; MeCN: acetonitrile; Pyrz: pyrazine; 4,4′-Bipy: 4,4′-bipyridine). The crystal structure of two 2 and 4 have been determined by X-ray diffraction methods. All compounds have been studied employing elemental analysis, IR, and UV-Visible spectroscopic techniques. The results have been compared with previous data reported for complexes with similar structures.

Keywords:

• Copper(II) complexes
• Haloaspirinate anions
• Crystal structures

Acknowledgments

This work was supported in part by the SGCyT of UNS funds (Project M24/081) and by CONICET of Argentina and FAPESP of Brazil. O.E. Piro is a Research Fellow of CONICET. M. Agotegaray is a fellowship holder of CONICET.