Wydział Chemii

Lesław Sieroń

M. Bukowska-Strzyżewska

Maria Korabik

Jerzy Mroziński

2002

Polyhedron

21

2473-2479

10.1016/S0277-5387(02)01232-9

Naukowa

Angielski

Artykuł

The title compounds [Cu(H₂O)(C₇H₆N₂)₂(C₆H₆O₄)] (I) and isostructural [Cu(H₂O)(C₇H₆N₂)₂(C₆H₈O₄)] (II) are the rarely observed seven-coordinate Cu(II) complexes of C₂ elongated square-pyramidal geometry with a double-capped base by two very long CuO(carboxylate) bonds. The valences of CuN and CuO bonds in I and II have been computed to confirm the assumed Cu(II) coordination number. The hydrogen bond system and Cu⋯Cu intra- and interpolymeric chain spacing in I and II have been analyzed to explain their magnetic properties. The magnetic susceptibility measurements of I and II in the range 1.7–300 K suggest weak antiferromagnetic interaction between Cu(II) centres. The EPR and d–d spectra of both complexes have been measured and analyzed.

The single-crystal X-ray structure analysis of I shows its isostructurality with the copper(II)-μ-adipato complex II. Both structures are the rarely observed seven-coordinate Cu(II) complexes of C₂ elongated square-pyramidal geometry with a double-capped base by two long CuO(carboxylate) bonds. The magnetic susceptibility measurements of I and II suggest weak antiferromagnetic interaction between Cu(II) centers. The EPR and d–d spectra of both complexes have been measured and analyzed.

Cu(II) stereochemistry, X-ray structures, Magnetism, EPR spectra

https://doi.org/10.1016/S0277-5387(02)01232-9

http://www.elsevier.com