Complexes of (phenazine)–˙ and (phenazine)2– with magnesium(II): syntheses of [Mg(C12H8N2)2(thf)3], [Mg(C12H8N2)(thf)2], and [Mg2Br2(C12H8N2)(thf)6]·[MgBr2(thf)4](thf = tetrahydrofuran)(X-ray authenticated)

Abstract

Phenazine and magnesium in tetrahydrofuran (thf) at ca. 20 °C afforded a paramagnetic complex, [Mg(C₁₂H₈N₂)₂(thf)₃](1), and in the presence of magnesium bromide diamagnetic [Mg(C₁₂H₈N₂)(thf)₂](2), then [Mg₂Br₂(C₁₂H₈N₂)(thf)₆] co-crystallized with [MgBr₂(thf)₄](1 : 1)(3); single crystal X-ray data revealed the phenazine-containing complex (3) to be monomeric, with two five-co-ordinate magnesium centres each bound to an N-centre 0.48 Å out of the ‘phenazine’ plane [Mg–N 2.052(7), Mg–Br 2.513(3), and Mg–O 2.066(5)–2.166(5)Å].