Pulsed electron-electron double resonance on multinuclear metal clusters: assignment of spin projection factors based on the dipolar interaction |
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Authors: | Elsässer Celine Brecht Marc Bittl Robert |
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Institution: | Institut für Experimentalphysik, Freie Universit?t Berlin, Arnimallee 14, 14195 Berlin, Germany. |
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Abstract: | The interaction between two paramagnetic metal centers, a 3Fe-4S](+) cluster and a NiFe] center, is investigated in the hydrogenase from Desulfovibrio vulgaris Miyazaki F by pulsed ELDOR (electron-electron double resonance). The distance between the metal centers is known from X-ray crystallography. The experimental dipolar spin-spin interaction deviates from the value expected for two point-dipoles located at the centers of the metal clusters. An extended spin-coupling model accounting for the spin coupling in the 3Fe-4S](+) cluster yields the observed interaction under the assumption of a particular magnetic coupling scheme for the three Fe ions. These results demonstrate that pulsed ELDOR can be used to gain insight into the inner structure of a multinuclear metal cluster. |
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