Synthesis, X-ray characterisation and spectroscopic studies of metal complexes of N,N′-1,2-xylene-α,α′-diylbis(pyridin-2-one)

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Abstract
The co-ordination modes adopted by N,N′-1,2-xylene-α,α′-diylbis(pyridin-2-one)(o-xbp) with Sc, Y, lanthanides, ThIV, MnII, FeIII, CoII and ZnII have been studied. Five representative complexes have been structurally characterised by single-crystal X-ray diffraction. In the monomeric ten-co-ordinate complex [Ce(o-xbp)2(NO3)3]·MeOH both o-xbp ligands form eleven-membered chelate rings. In the dinuclear complex [Y2(o-xbp)3(NO3)6]·3MeCN pairs of nine-co-ordinate Y atoms are linked by an o-xbp bridge, whilst the other o-xbp ligands form chelate rings. The dinuclear complex [{Zn(o-xbp)Cl2}2] forms individual 22-membered rings in which pairs of tetrahedrally co-ordinated Zn atoms are linked by o-xbp bridges. In the iron(III) complex [Fe(o-xbp)2Cl2][FeCl4]·MeOH the Fe atom in the cation has cis-octahedral co-ordination geometry with the o-xbp ligands forming eleven-membered chelate rings; the anion is tetrahedral. In the cobalt(II) complex [Co(o-xbp)2(MeOH)2]I2·2MeOH the o-xbp ligands also chelate but the Co atom has a trans-octahedral geometry in which the two axial ligands are methanol molecules. A distinctive pattern of ligand conformations is observed in this series of compounds. Relevant spectroscopic results are also given.

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