Synthesis and structures of zinc alkoxo, aryloxo and hydroxo complexes with an amidodiamine ligand

The synthesis and characterization of zinc complexes bearing an amidodiamine ligand, (EtO)4Zn3[N(CH2CH2NMe2)2]2 (1), [(Et3CO)ZnN(CH2CH2NMe2)2]2 (2) and [(2,6-iPr2C6H3O)ZnN(CH2CH2NMe2)2]2 (3), [(Me3Si)2N]Zn[N(CH2CH2NMe2)2] (4) and [(Me3Si)2N]2Zn2(OH)[N(CH2CH2NMe2)2] (5), are reported. Compounds 1–3 are synthesised in the reactions of {Zn[N(CH2CH2NMe2)2]2}2 with 2 equiv. of ethanol, 3-ethyl-3-pentanol and 2,6-diisopropylphenol, respectively. Compound 4 is obtained by the reaction of Zn[N(SiMe3)2]2 with HN(CH2CH2NMe2)2, and compound 5 is synthesised by reacting 4 with 1 equiv. of H2O. Compound 4 is characterized by NMR and MS while all of the other compounds are characterized with NMR, MS, elemental analysis and single-crystal X-ray diffraction. Compound 1 is a trinuclear species containing a Zn3N2O2 core. Compounds 2 and 3 are dimeric with planar Zn2N2 rings. Compound 5 is dimeric with a planar Zn2NO ring.

Graphical abstractPartial ligand substitution in the diamide {Zn[N(CH2CH2NMe2)2]2}2 produced alkoxo and aryloxo Zn compounds having a trinuclear or dimeric Zn structure. The reaction of Zn[N(SiMe3)2]2 with HN(CH2CH2NMe2)2 afforded [(Me3Si)2N]Zn[N(CH2CH2NMe2)2]2, which further reacted with H2O forming a hydroxo Zn complex.Figure optionsDownload full-size imageDownload as PowerPoint slide