Rotated geometry: The first example of a dinuclear iron(I)-iron(I) complex featuring a fully rotated geometry related to the active site of [Fe-Fe] hydrogenase is reported.

A series of ruthenium tris(β-diketonate) complexes was investigated by using electrochemistry, UV/Vis spectroscopy, 1 H NMR and 13 C NMR spectroscopy and FAB mass spectroscopy. Several new mononuclear mixed-ligand ruthenium(III) complexes were prepared: with three dibenzoylmethanate ions (dbm) {[Ru(dbm) 3 ] (1)}, one or two acetylacetonate ions (2,4-pentanedionate, acac) {[Ru(dbm) 2 (acac)] (2)