A Complete Triad of Zero-Valent 17-Electron Monoradicals of Group 7 Elements Stabilized by m-Terphenyl Isocyanides |
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| Authors: | Dr Federico Salsi Dr Shuai Wang Dr Christian Teutloff Marvin Busse Dr Michael L Neville Dr Adelheid Hagenbach Prof Dr Robert Bittl Prof Dr Joshua S Figueroa Prof Dr Ulrich Abram |
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| Institution: | 1. Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstr. 34/36, 14195 Berlin, Germany;2. Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive MC 0358, La Jolla, CA 92193 USA;3. Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany |
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| Abstract: | The first consistent series of mononuclear 17-electron complexes of three Group 7 elements has been isolated in crystalline form and studied by X-ray diffraction and spectroscopic methods. The paramagnetic compounds have a composition of M0(CO)(CNp-F-ArDArF2)4] (M=Mn, Tc, Re; ArDArF2=2,6-(3,5-(CF3)2C6H3)2C6H2F) and are stabilized by four sterically encumbering isocyanides, which prevent the metalloradicals from dimerization. They have a square pyramidal structure with the carbonyl ligands as apexes. The frozen-solution EPR spectra of the rhenium and technetium compounds are clearly anisotropic with large 99Tc and 185,187Re hyperfine interactions for one component. High-field EPR (Q band and W band) has been applied for the elucidation of the EPR parameters of the manganese(0) complex. |
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| Keywords: | Group 7 Elements High-Field EPR Metalloradicals Monoradicals m-Terphenyl Isocyanides |
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