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Synthesis, structures and properties of ironIII complexes with (o-carboranyl)bis-(2-hydroxymethyl)pyridine: Racemic versus meso

AuthorsMin Ying Tsang; Teixidor, Francesc ; Viñas, Clara ; Choquesillo-Lazarte, Duane ; Aliaga-Alcalde, N.; Giner Planas, José
Boron clusters
Issue Date1-Jul-2016
CitationInorganica Chimica Acta 448: 97–103 (2016)
AbstractThe reaction of iron(II) chloride with anti- or syn-1,2-bis{(pyridin-20-yl)methanol}-1,2-dicarba-closododecaborane (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 D,D-[Fe2Cl2(RRanti-oCB-L12 )2] and K,K-[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.
Publisher version (URL)http://dx.doi.org/10.1016/j.ica.2016.04.028
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