ONIUM DIAMINOTETRACARBOXYLATES OF GERMANIUM(IV): SYNTHESIS, STRUCTURE, APPLICATIONS

Coordination compounds of grmanium(IV) have been obtained through an interaction of GeO2 in aqueous solutions with ethylenediaminetetraacetic (H4Edta) or 1,3-diamino-2-hydroxypropanetetraacetic (H5Hpdta) acid followed by addition nicotinamide (Nad) in different molar ratios. The composition and structure of obtained compounds have been determined by elemental analysis, IR spectroscopy, mass spectrometry, and thermogravimetry. Taking into account the data obtained by mass spectrometry regarding the existence of the protonated form of НNad+ and complex acid-germanate(IV) anions in methanol-aqueous solution, the following formulas were assigned to the new compounds: (HNad)[Ge(ОН)(Еdta)]∙H2O (1), (HNad)[Ge(ОН)(НHpdta)(Н2О)] (2). It has been shown that seed treatment of winter pea variety Balltrap with aqueous solutions of compounds 1, 2 (Ge content in substance 0.05 g/l) led to increasing content in microgreens the protein (complex 1 – 6.40%; complex 2 – 6.65%; control (H2O) – 5.22%; complex fertilizer – 5.26%) and germanium (25.89, 21.13 ppm for 1 and 2, respectively; control (H2O) – 0.46 ppm; complex fertilizer – 0.32 ppm). In addition, it has been noted that the growth-stimulating effect of the complex (HNad)[Ge(ОН)(Еdta)]∙H2O at the initial stages of growth and development of pea microgreen sprouts and increasing its raw biomass by 6% compared to the control.