Organosilicon Amine Complexes of Cobalt(II), Cromium(III), and Neodymium(III): Synthesis and Properties

Abstract

Organosilicon amine complexes [Co(NH2R1)2Cl2] (I), [Cr(NH2R1)3Cl3] (II), and [Nd(NH2R1)3Cl3] (III) [R1 = CH2CH2CH2Si(OEt)3] were synthesized by reacting anhydrous cobalt, chromium, or neodymium chlorides with 3-aminopropyltriethoxysilane (NH2R1). Complexes I–III occur as colored viscous liquids that polymerize in air due to hydrolysis of triethoxy groups and condensation of the obtained silanol groups. Organosilicon films with a thickness of 10–200 μm on glass and quartz substrates were obtained from liquid compositions containing complexes I–III, siloxanediols HO(SiMe2O)nH (n = 2–5), and alkoxysilanes NH2R1, MeSi(OMe)3, and PhSi(OMe)3 by solidification in air or vacuum. The obtained films were characterized by IR and electron spectroscopies, photoluminescence, transmission electron microscopy, and energy dispersion X-ray fluorescence analyses. IR and electron spectroscopies were used to study the structurization of the films and their behavior when heated to 100–300°C or exposed to gaseous O2, NO, NH3, or HCl. The film containing complex I was found to withstand heating in air to 250°C and to change its color in the atmosphere of NO, NH3, and HCl. Complex I reversibly absorbs oxygen, and in the atmosphere of HCl, it converts into [NH3R]2[CoCl4]. The Z-scanning method was used to uncover the cubic nonlinear-optical properties of the metal complexes.