SYNTHESIS, STRUCTURE AND PROPERTIES OF MIXED-METAL Li-Ge(IV) COMPLEXES WITH CITRIC, TARTARIC AND XYLARIC ACIDS
| Autor: | A. Ph. Pozharitskiy, E. B. Kravchenko, E. E. Martsinko, Elena Chebanenko, А. G. Pesaroglo, I. I. Seifullina |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Vìsnik Odesʹkogo Nacìonalʹnogo Unìversitetu: Hìmìâ, Vol 21, Iss 3(59), Pp 32-41 (2016) |
| ISSN: | 2414-5963 2304-0947 |
| Popis: | Different-metal complexes of lithium and germanium(IV) with hydroxycarbonic acids – citric (H4Citr), tartaric (H4Tart) and xylaric (H5Xylar) have been obtained for the first time and characterized by methods of elemental analyses, thermogravimetry, IR-specroscopy.In the first step of the compounds’ synthesis, weighed portions of GeО2and hydroxycarbonic acid (H4Citr, H4Tart or H5Xylar) have been added into hot water (250-300 ml), heated (рН 1,5-2) and concentrated in the water bath to 50 ml (~4.5 h). In the second step, precisely weighed portion of СН3СООLi·2Н2О has been added to obtain solutions. The mixtures have been stirred for 5-10 min without heating and then filtered. The resulting complexes have been precipitated by adding an equal volumes of ethanol (for І) or acetonitrile (for III) to the corresponding solutions. Residue of the complex II have been precipitated from the corresponding solution in one day. The yield of the products has been 60–75%. Study of the thermal stability of complexesІ-IIIhas shown that their thermolysis is proceed stepwise. Their IR-spectrums contain bands ν(С=О) (only complex I), one or two νas(СОО–) bands and νs(СОО–) bands, three ν(Ge–O) bands and also alcoholate ν(С–О) (in the absence of the C–OH bending vibrations).According to the results of research and physical and chemical analyzes, there have been established, that obtained coordination compounds are complexes of cationic-anionic type: Li2[Ge(НCitr)2]∙2H2O (I), Li2[Ge2(OH)2(µ-Tart)2]∙4H2O (IІ), Li4[Ge2(OH)2(m-Xylar)2]∙4Н2О (III). Schemes of structures of the compounds I-IIIhave been proposed. Antipsychotic activity of the complexIIIhas been shown. |
| Databáze: | OpenAIRE |
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