SYNTHESIS AND RESEARCH OF COORDINATION COMPOUNDS OF GERMANIUM(IV) WITH GALLIC ACID AND ETHYL GALLATE

Optimal methods of synthesis of germanium(IV) complexes with gallic acid (H4Gal) and ethyl gallate (H3EtGal) in aqueous solution have been developed. The compounds have been characterized by research methods: elemental analysis, thermogravimetry, infrared spectroscopy, and mass spectrometry. The composition and structure of the studied compounds have been determined. It has been shown that the complexes [Ge(H2Gal)(H3Gal)2]∙H2O (1) [Ge(HEtGal)(H2EtGal)2]∙2H2O (2) have a germanium : H4Gal (H3EtGal) ratio of 1:3, in coordination with Germanium(IV) involved two hydroxyl groups from each ligand, forming an octahedral coordination polyhedron of this metal.