Relatively stable N-ligated [2Fe2S](2+) clusters with dipyrromethane capping ligands |
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Authors: | Ballmann Joachim Sun Xianru Dechert Sebastian Bill Eckhard Meyer Franc |
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Institution: | Institut für Anorganische Chemie der Georg-August-Universit?t, Tammannstrasse 4, D-37077 G?ttingen, Germany. |
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Abstract: | 2Fe2S] clusters with terminal N-ligation (His, Arg) and unique functions are increasingly recognized in biological systems. In this work three new 2Fe2S] clusters 1-3 with different 1,1'-dipyrrolmethane derivatives as chelating terminal ligands have been prepared and fully characterized, including by X-ray crystallography: (NEt(4))(2)L(2)Fe(2)(mu-S)(2)] with L=Me(2)C(C(4)H(3)N)(2) (1), Ph(2)C(C(4)H(3)N)(2) (2), (CH(2))(5)C(C(4)H(3)N)(2) (3). These systems represent rare examples of synthetic 2Fe2S] complexes with N-donor capping ligands. While geometric parameters as well as spectroscopic and electrochemical characteristics of the new complexes are as anticipated, the chelating nature of the terminal ligands in 1-3 imparts a relatively high stability that will be advantageous for reactivity studies of the 2Fe2S] core. |
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Keywords: | Bioinorganic chemistry Iron-sulfur clusters N ligands Pyrrol ligands |
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