Halogermanium(II) Complexes Having Phenylamidinate As Supporting Ligands: Syntheses, Characterizations, and Reactivities

Abstract

Novel germylenes [{Me 3 SiNC(Ph)NSiMe 3 }GeX] (X = Cl, Br, I) and [{Me 3 SiNC(Ph)NSiMe 3 } 2 Ge] with the bidentate phenylamidinato ligand have been synthesized in high yields by a salt metathesis reaction between Cl 2 Ge·dioxane or I 2 Ge and the lithium salt of the ligand. They were characterized by 1 H and 13 C NMR and mass spectrometry and single-crystal X-ray structure analyses, which confirmed N-chelation and a three-coordinate germanium center. The cycloaddition reactions with o -quinone led to cycloadducts, whose structures were determined by X-ray analyses. The chelation of the ligand to the metal center was conserved, affording penta- and hexacoordinated germanium(IV) atoms. Complexation reactions with [codW(CO) 4 ] and [nbdMo(CO) 4 ] resulted in trinuclear bis(germanium(II)) transition-metal complexes in “ trans ” octahedral geometry.