title: Synthesis and structural characterization of iron complexes bearing N-aryl-phenanthren-o-iminoquinone ligands.
abstract: Treatments of N-aryl-phenanthren-o-iminoquinone (aryl = 2,6-Me2C6H3(MeL); 2,6-iPr2C6H3(iPrL)) with iron powder in THF at 75 °C generate complexes [η2L]2Fe[η1LH] (1a, L =MeL; 1b, L =iPrL) in moderate yields. The X-ray crystallography analysis reveals that the molecule of 1b consists of a Fe(iii) center coordinated by three phenanthren-o-iminosemiquinone ligands, two of which are in an η2fashion while the remaining one is in an η1fashion. The analysis of the bond parameters of ligands indicates that the η2-fashioned ligands are radical anions and the η1-fashioned one is in an aminephenolato form. Reactions ofMeL andiPrL with FeCl2in THF produce Fe(iii) complexes [L]2FeCl (2a, L =MeL; 2b, L =iPrL) with the two ligands in the radical anionic form. However, similar reactions of PIQ ligands with FeCl2in CH2Cl2yield ion-pair complexes {[L]2FeCl}+[FeCl4]-(3a, L =MeL; 3b, L =iPrL), in which the iron center chelated by two neutral ligands can be formulated as Fe(ii). Reduction of 2b with sodium provides a salt-type complex [iPrL2-]2Fe(ii)Na2(4), in which a high spin Fe(ii) atom is ligated by two amidophenolate ligands, and the sodium atoms attached to the oxygen atoms of ligands are η3-coordinated by the aryl ring in amido moieties.
authors: College of Chemistry, Jilin University, Changchun, China. gw@jlu.edu.cn.
authors: Bin
authors: B
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authors: Anjie
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