Inorganic Chemistry, Vol.50, No.5, 1926-1930, 2011
Magnesium(II) Complexes of 2,4-N,N'-Disubstituted 1,3,5-Triazapentadienyl Ligands: Synthesis and Characterization of [N(Dipp)C(NMe2)NC(NMe2)N(SiMe3)MgBr](2) and [N(R)C(R')NC(R')N(SiMe3)](2)Mg (Dipp=2,6-' Pr-2-C6H3, R = Ph, SiMe3; R' = NMe2, 1-piperidino)
Treatment of the appropriate lithium or sodium 2,4-N,N'-disubstituted 1,3,5-triazapentadienate [RNC(R')NC(R')-N(SiMe3)M](2) (R = Ph, 2,6-Pr-i(2)-C6H3(Dipp) or SiMe3; R' = NMe2 or 1-piperidino; M = Li or Na) with one or half equivalent portion of MgBr2(THF)(2) in Et2O under mild conditions furnishes in good yield the first structurally characterized molecular magnesium 2,4-N,N'-disubstituted 1,3,5-triazapentadienates [DippNC(NMe2)NC(NMe2)N(SiMe3)MgBr](2) (1), [{RNC(R')NC(R')N(SiMe3)}(2)Mg] (R = Ph, R' = NMe2 2; R = Ph, R' = 1-piperidino 3; R = SiMe3, R' = 1-piperidino 4). The solid-state structure of 1 is dimeric and those of 2, 3, and 4 are monomeric. The ligand backbone NCNCN in 1 adopts a W-shaped configuration, while in 2, 3 and 4 adopts a U-shaped configuration.