Synthesis and characterisation of aluminium and magnesium complexes supported by pendant oxalic amidinate ligands

Abstract

Two pendant oxalic amidine compounds [C₆H₅NC{NH(CH₂)₂OMe}–C{NH(CH₂)₂OMe}NC₆H₅] (1) (oxam(OMe)₂H₂) and [C₆H₅NC{NH(CH₂)₂NMe₂}–C{NH(CH₂)₂NMe₂}NC₆H₅] (2) (oxam(NMe₂)₂H₂) are described. Reactions of 1 or 2 with two molar equivalents of AlMe₃ in toluene give the bimetallic complexes [(Me₂)Al(oxam(OMe)₂)Al(Me₂)] (3) and [(Me₂)Al(oxam(NMe₂)₂)Al(Me₂)] (4), respectively. Treatment of 1 or 2 with two molar equivalents of MeMgBr in THF affords the bimetallic complexes [(Br)(THF)Mg(oxam(OMe)₂)Mg(THF)(Br)] (5) and [(Br)(THF)Mg(oxam(NMe₂)₂)Mg(THF)(Br)] (6) respectively. The crystal and molecular structures are reported for compounds 1, 2, 3, 5 and 6.