Kornieiev S. Hybrid silica-organic materials with immobilized complexing triphenylmethane dyes: obtaining, physicochemical and complexing properties

Objects of investigation: hybrid silica-organic materials with immobilized triphenylmethane dyes, their physical-chemical and complexing properties. Purposes of the work: obtaining of the silica-organic materials with immobilized complexing triphenylmethane dyes with firm fixation of modificator. Characterizing of the particularities of immobilized reagents as compared to the native analogues based on the investigations of physical-chemical and complexing properties of these materials. Methods: quantitative physical-chemical analysis, electronic spectroscopy of radiosity, scanning vacuum electronic spectroscopy, IR spectroscopy, atomic absorption spectroscopy, potentiometry, spectrophotometry, X-ray spectrum analysis, mathematical methods of parametric identification of the equilibrium systems. Theoretical and practical results: The kinetic and thermodynamic characteristics of the sorption immobilization of triphenylmethane complexing dyes on silica surface as well as conditions of triphenylmethane dyes fixation using the sol-gel synthesis providing the high stability of materials against modificator scavenging were obtained. Morphological characteristics of hybrid materials obtained, equilibrium constants of the interactions between metal ions and dyes immobilized, spectral properties of these dyes and metal complexes, the opportunity to apply the hybrid materials for toxic metals ions determination were studied as well. Novelty: In the case of materials obtained by the sol-gel method, effects of energetic heterogeneity were found to be rather weak as compared with reactions on surfaces of chemically modified silicas. The interaction of immobilized reagents with surface silanol groups was concluded to remain the important factor which gives rise to difference between properties of immobilized reagents and their native analogs. Field of application: simplification of the methods of organic analytic reagents immobilization both at uncovalent bonding and at sol-gel synthesis and revelation of the factors that determine the changes in reagents properties at immobilization allow to obtain the new solid-phase analytical reagents with firm fixation of modificator. Application degree: The obtained result it is realized in the educational process of chemical department V. N. Karazin Kharkiv National University.