A Square-Planar Ruthenium(II) Complex with a Low-Spin Configuration


  • This work was supported by the Emmy-Noether program of the Deutsche Forschungsgemeinschaft (SCHN950/2-1). B.A. Thanks the international graduate school NANOCAT and the TUM Graduate School. M.M.K. thanks the Fonds der Chemischen Industrie for a Liebig stipend.


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Ground-about: The ruthenium(II) complex [RuCl{N(CH2CH2PtBu2)2}] (B) is obtained in high yield by the reaction of [RuCl2{HN(CH2CH2PtBu2)2}] (A) with KOtBu. Complex B exhibits an unusual electronic low-spin (S=0) ground-state configuration. Comparison with Caulton's [RuCl{N(SiMe2CH2PtBu2)2}] (ground state: S=1) shows that the ground-state spin multiplicity in these complexes is controlled by the N→Ru π-donor strength.