Structural and spectroscopic properties of two new isostructural complexes of lapacholate with cobalt and copper

R. A. FARFÁN; J. A. ESPÍNDOLA; M. I. GÓMEZ; M. C. L. DE JIMÉNEZ; M. A. MARTÍNEZ; O. E. PIRO ; E. E. CASTELLANO

International Journal of Inorganic Chemistry

Hindawi Publishing Corporation

Año: 2012 vol. 2012 p. 1 - 6

2090-2026

The molecular structures of two isomorphous complexes of lapacholate (Lap) anion and Dimetilformamide(DMF), M(Lap)2(DMF)2 with M: Co Cu, were determined by X-ray diffraction methods. The substances crystallize in the triclinic space group with one molecule per unit cell and constants a=7.7591(3), b=10.3560(3), c=11.2224(4) Å, =95.110(2), =94.310(2) and =107.704(2)º for the Co complex and a=7.9308(2), b=10.0033(4), c=10.7508(4), =97.387(2), =93.621(2) and =103.980(2)º for the Cu complex. The structures were solved from 2933 (Co) and 2888 (Cu) reflections with I>2σ(I) and refined by full matrix least-square to an agreement R1-factor of 0.041 (Co) and 0.033 (Cu). The metal(II) ion is sited on a crystallographic inversion center in a MO6 octahedral environment. This ion is coordinated equatorially to two lapacholate anions through their adjacent carbonyl and phenol oxygen atoms [M-O bond distances of 2.134(1) and 2.008(1) Å (Co) and 2.301(1) and 1.914(1) Å (Cu)] and axially to two DMF molecules through oxygen atoms [M-O bond lengths of 2.143(1) Å (Co) and 2.069(1) Å (Cu)] .