Synthesis and structure of new anionic five-coordinate silicon complexes derived from α-hydroxy acids and 1-methylpiperazine-2,5-dione.

Autor:	Nikolin, A. A., Korlyukov, A. A., Kramarova, E. P., Arkhipov, D. E., Shipov, A. G., Baukov, Yu. I., Negrebetskii, Vad. V.
Předmět:	SILICON compounds ESTERIFICATION NUCLEAR magnetic resonance spectroscopy X-ray diffraction SILICON ACIDS
Zdroj:	Russian Chemical Bulletin; Aug2019, Vol. 68 Issue 8, p1575-1579, 5p
Abstrakt:	Anionic five-coordinate complexes with two bis-O,O'-chelating ligands bearing α-hydroxy acid moieties, dicyclohexylammonium salts Cy 2 NH 2 + { PpnCH 2 Si [ OCR 2 C (O)O] 2 } − (Cy is cyclohexyl, PpnCH2 is 4-methyl-2,5-dioxopiperazin-1-ylmethyl, R = Me, Ph), were synthesized by esterification of alkoxysilane PpnCH2Si(OMe)3 with α-hydroxy acids (dimethyl- and diphenylgylcolic acids) in the presence of dicyclohexylamine. The five-coordinated state of the silicon atom in the resulting compounds in solution was confirmed by 29Si NMR spectroscopy. According to the X-ray diffraction data, the synthesized compounds contain the SiCO4 coordination unit. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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