Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1407181 | Journal of Molecular Structure | 2008 | 6 Pages |
Abstract
Dinuclear metal compounds [(LnM)(μ-BLâ)(MLn)]k involving radical anions of bridging ligands BL such as 2,2â²-azobispyridine or 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine and coordinated inorganic or organometallic complex fragments MLn containing copper(I), rhenium(I), ruthenium(II), osmium(II), rhodium(III) or iridium(III) have been investigated in frozen solutions using high field EPR spectroscopy at W band (95 GHz) or higher frequencies. The generally small but still rather variable anisotropy of the g factor shows typical patterns reflecting the specific metal/ligand interactions, the competition between bridging and ancillary ligands for spin density, and the spin-orbit coupling constants of the metals. The EPR data are thus shown to specify the structural data as obtained from X-ray crystallography for a standard series of diphosphinocopper(I) complexes involving the radical ligands indicated. The (RNNR)â group can be placed next to the related superoxide (OO)â as a paramagnetic ligand with specific geometrical and electronic structure.
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Authors
Biprajit Sarkar, Stephanie Frantz, Sayak Roy, Monika Sieger, Carole Duboc, Gert Denninger, Hans-Jürgen Kümmerer, Wolfgang Kaim,