COMPLEXES OF 1-(2-ETHOXYETHYL)-4- (DIMETHOXYPHOSPHORYL)-4-HYDROXYPIPERIDINE WITH IONS OF BIOGENIC METALS: SYNTHESIS AND PROPERTIES

Abstract

The complexation of 1-(2-ethoxyethyl)-4-(dimethoxyphosphoryl)-4-hydroxypiperidine with ions of biogenic metals (Co+2, Ni+2, Cu+2, Mn+2) in the ligand : ion ratio of 2:1 had been studied. It had been turned out that cobalt and nickel ions generate stable complexes, whereas the product obtained with copper and manganese ions is basically a mixture of the ligand and the corresponding salt. By modeling with the semiempirical PM3 method, it had been shown that a complex in which the divalent metal ion forms coordination bonds with nitrogen atoms and oxygen with a double bond on phosphorus is energetically most advantageous, with the piperidine cycle being in the “boat” conformation. CoL2Cl2 (Kaz-10) and [MnL2SO4] (Kaz-11) at a concentration of 1.0.10-3% significantly stimulate the germination of barley and wheat seeds.

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