Subject of investigation: composition, stability, optical properties of complexes of 4f-elements. Object of investigation: 4f-element complexes with colored ligands and b-diketones. Aim of investigation: establishment of the connection between the composition, optical properties of complex compounds of 4f-elements and parameters characterized the nature of central ion and ligand, the choice on this base the best analytical forms as well as the development of the main methodical approaches to the luminescence determination of some lanthanides. Methods of investigation: potentiometric, luminescence, spectrophotometric, IR-, NMR-spectroscopy, molecular mechanic, element analysis. Theoretical results and novelty: the systematic investigation of connection between the composition, stability and spectral-luminescence properties of Ln complexes with different acetylacetone derivatives and the parameters characterized the nature of central ion and ligand has been performed; the equations for describing the ch ange of physical, physical-chemistry properties of lanthanide ions and their complexes in lanthanide series were proposed; the dependences for properties of lanthanide complexes, characterized their ability to the absorption and emission of the light energy, on various ligand parameters has been established and described by the correlation equations; the alteration of charges on the atoms in chelate cycle of lanthanide b-diketonates has been studied and it was found that the intensity of light absorption, intensity, quantum yield and lifetime of luminescence for Sm, Eu, Nd and Yb complexes correlate with the charge values on the oxygen donor atoms; it was shown that the luminescence intensity of lanthanide b-diketonates in the series of acetylacetone derivatives with fluorinated substituents (CF3-C8F17) directly depends on hydrophobicity of the ligands and contribution of the covalent constituent into the Ln-O bond; the formation of the shell of complex close to the spherical by the long fluorinated substitue nts (C6F13) of perfluoro-b-diketones has been demonstrated; on the base of established regularities and correlation dependences the ways of decreasing the intra- and inter-molecular energy losses of complex have been grounded; the luminescence of Nd and Yb complexes with colored reagents and Nd, Tm, Yb with b-diketones has been studied and first used in the analytical purposes. Practical results and novelty: Using proposed equation the sucessive stability constants of Ln complexes with 11 acetylacetone derivatives were calculated; the possibility of increasing the luminescence intensity of Ln complexes has been realized by using the b-diketones with long fluoroalkyl substituents (C6F13, C8F17), deutering the central CH-group of b-diketone, application of polymeric b-diketones or polymeric sorbent (polymethylmethacrelate) modified by b-diketones; the methods for luminescence determination of Eu, Sm, Nd and Yb in various objects have been developed; using the copolymers the detection limit of Eu in oxidesof lan thanides-quenchers of luminescence was reduced by 1-2 order of value; by means of the directed choice of the ligands the method for analysis of Sm2O3 on the content of Nd and Yb micro impurities that were not early determined by luminescence method has been developed; the ways for the masking of hindering elements based on different stability of lanthanide complexes with masking agents (determination of Tm in oxides of quenchers of luminescence - Ce, Pr, Nd) and change of the valent state of element-base (determination of Nd and Sm in Eu2O3) have been introduced into the practice of luminescence analysis. Subject and degree of introduction: The developed methods of determination of Sm, Eu, Nd and Yb have been introduced into the practice of work of different concerns. Field of application: inorganic chemistry, analytical chemistry
