Pesaroglo A. Different-ligand and different-metal germanium (IV) complexes with hydroxycarbonic acids. Synthesis, structure and properties.

Thesis is dedicated to the synthesis and investigation of structure and properties of 39 new different-ligand and different-metal complexes of germanium (IV) on the base of hydroxycarbonic acids. Complexes are investigated by elementary and X-ray phase analysis, conductivity and magnetic susceptibility measurements, thermogravimetry, spectral (diffuse reflection and IR spectroscopy) methods. The X-ray crystal structure analysis of 6 compounds (3 different-metal ones) has been carried out. Existing in solution complex acids are used as construction blocks for obtaining different-metal complexes with some s- and d-metal ions for the first time H2[Ge(HCitr)2], H2[Ge(Mal)2], H2[Ge2(µ-Tart)2(ОН)2], H2[Ge(µ-H2Thgl)2]. An idea of preparative selection of highsoluble bis-(citrate-, malate-, threehydroxyglutarate-), tartrategermanium acids as outersphere different-ligand complexes is realized. It is set that hydroxyacidic complexes of germanium (IV) are characterized by variety of structures which change in depend of number, mutual location of carboxyl and hydroxyl groups in molecule of acid, outer-sphere ligand and also the second ion - complex former. The high capacity of the synthesized hydroxyacidic complexes of germanium is exposed to show pharmacological, biological and catalytic activity. Key words: germanium, hydroxycarbonic acids, different-ligand complexes, different-metal complexes, crystal structure.