Organosilicon amine complexes of cobalt(II), cromium(III) and neodymium(III): Synthesis and properties

Organosilicon amine complexes [Co(NH2R1)(2)Cl-2] (I), [Cr(NH2R1)(3)Cl-3] (II), and [Nd(NH2R1)(3)Cl-3] (III) [R-1 = 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 mum on glass and quartz substrates were obtained from liquid compositions containing complexes I-III, siloxanediols HO(SiMe2O)(n)H (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 Xray fluorescence analyses. IR and electron spectroscopies were used to study the structurization of the films and their behavior when heated to 100-300degreesC or exposed to gaseous O-2, NO, NH3, or HCl. The film containing complex I was found to withstand heating in air to 250degreesC 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.