[Zurück]

P. Weinberger, F. Renz, W. Linert, K. Mereiter, R. Boca:
"Halide -bridged tetranuclear copper(II)-complexes: structural, vibrational and magnetic properties of (µ₄-oxo)-hexakis(µ₄-chloro)-tetrakis((morpholine)-copper(II))";
Poster: XXXI International Conference on Coordination Chemistry ICCC 31, Vancouver, Kanada; 18.08.1996 - 23.08.1996; in: "abstracts", (1996), S. 145.

As polynuclear copper(II)-complexes play a significant role in redox processes in biological systems we investigated the structure and electronic surrounding of the copper(II)-coordination centers of the tetranuclear copper(II) complex Cu₄OCl₆(mor)₄ , which can be looked at as an easy to obtain enzyme-mimetic complex. The compound has been characterised by X-ray diffraction and vibrational spectroscopy (Raman and IR) as well as by UV-VIS spectroscopy to elucidate the molecular structure and electronic properties. The expeimental data have been supported by quantum-chemical calculations on semi-empirical level (ZINDO/1) as well as HF and DFT-level. The yielded electron density distribution sheds light on the reactivity of the coordination centers. Temperature dependent magnetic susceptibility measurements show a rather interesting behaviour as this complex contains four paramegnetic copper(II) atoms (which are Jahn-Teller active) bridged by diamagnetic atoms, i.e. the six µ₂-chlorides and the central µ₄-oxygen.