Abstract
The reaction of iron(II) chloride with anti- or syn-1,2-bis{(pyridin-2′-yl)methanol}-1,2-dicarba-closo-dodecaborane (anti- or syn-oCB-L1) afforded two new complexes, [Fe2Cl2(anti-oCB-L12−)2] (1) or Fe2Cl3(syn-oCB-L12−)(EtO)(H2O) (2), respectively. Both complexes were unambiguously characterized by means of X-ray structure analysis. Their solid state structures give evidence for the different coordination modes of the ligands. Both compounds are dinuclear FeIII complexes, however, whereas in complex 1 there are two anti-oCB-L12− ligands per molecular unit, in complex 2 only one syn-oCB-L12− is found. In complex 1, anti-oCB-L12− acts as a tetradentate N2O2-ligand affording a homochiral complex as a partial racemic mixture of Δ,Δ-[Fe2Cl2(RRanti-oCB-L12−)2] and Λ,Λ-[Fe2Cl2(SSanti-oCB-L12−)2]. In complex 2, syn-oCB-L12− behaves as a bis-bidentate NO ligand. Only complex 1 could be synthesized in good yield and as a pure phase and it has been therefore fully characterized by spectroscopic methods and the magnetic properties studied.
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