title: Relatively stable N-ligated [2Fe2S](2+) clusters with dipyrromethane capping ligands.
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.
authors.affiliation: Institut für Anorganische Chemie der Georg-August-Universität, Tammannstrasse 4, D-37077 Göttingen, Germany.
authors.forename: Joachim
authors.initials: J
authors.lastname: Ballmann
authors.forename: Xianru
authors.initials: X
authors.lastname: Sun
authors.forename: Sebastian
authors.initials: S
authors.lastname: Dechert
authors.forename: Eckhard
authors.initials: E
authors.lastname: Bill
authors.forename: Franc
authors.initials: F
authors.lastname: Meyer
mesh_terms: D001665:Binding Sites; D018360:Crystallography, X-Ray; D007501:Iron / Q000737:chemistry*; D007502:Iron Chelating Agents / Q000138:chemical synthesis / Q000737:chemistry; D007506:Iron-Sulfur Proteins / Q000737:chemistry; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D011758:Pyrroles / Q000138:chemical synthesis / Q000737:chemistry*; D013455:Sulfur / Q000737:chemistry*
chemical_list: D007502:Iron Chelating Agents; D007506:Iron-Sulfur Proteins; D008024:Ligands; D011758:Pyrroles; C512015:dipyrromethane; D013455:Sulfur; D007501:Iron