Unsymmetrically substituted dimethyldiaminosilanes as ligands towards zirconium(IV)

Unsymmetrically substituted dimethyldiaminosilanes of the general formula SiMe2(NR2)(NR2) have been prepared by treating LiNR2 with SiMe2Cl(NR2) (NR2, NR2 = NMe2, NC4H8, NHiPr, NHtBu, NHCH2CH2NMe2 or NHCH2CH2OMe). Their ligating properties towards zirconium(IV) have been investigated as a function of the nitrogen substituents and the syntheses of the binary compound Zr[SiMe2(NiPr)(NtBu)]2 and of the zirconium derivatives ZrX3(L) [X = Cl, NMe2; L = SiMe(NR)(NR2), NR = NiPr, NtBu, NCH2CH2NMe2, NCH2CH2OMe; NR2 = NMe2, NC4H8, NHiPr, NHtBu] are also reported. The solution structures and dynamics of the compounds have been elucidated by 1D/2D multinuclear NMR spectroscopy