Synthesis of Five Coordinate Spirocyclic Germanium(IV) Complexes Containing Diethanol Amine

Reaction of dihydroxo(2,2′‐iminodiethanolato‐AWO′) germanium(IV) (A) or dihydroxo(2,2′‐methyliminodiethanolato‐ N ,O. O′ ) germanium(IV) (B) with bidentate ligands, e.g. diol, α‐hydroxy acid, oxalic acid, 2,6‐pyridinedicarboxylic acid, or 2‐aminophenol in a mixture of ethanol and xylene mixture yielded a series of unsymmetrical spiro‐germanium complexes 1‐6. These complexes were characterized by NMR, IR, mass spectra and elementary analysis. The 1 H NMR spectrums of all these compounds show the existence of an intramolecular N – Ge bond. X‐ray analysis of compound 6 shows a short N–Ge bond (2.08 Å).