Исследование стабильности цинковых комплексов дипиррометенов в протонодонорных средах

Abstract

At present a study of complexes of dipyrromethene complexes with different structure is one of the most successfully developing areas of modern chemistry. The most perspective members of this family are boron fluorinated complexes of dipyrromethenes (BODIPY). Depending on the structure of the ligand and a solvent, they have optimal characteristics for the fluorophores: high fluorescence quantum yield, a good photostability. Also, dipyrromethene can form stable complexes with ions of d-elements, such as Zn(II). The main advantage complexes of Zn(II) with dipyrromethens is easy to "self-assembly" in the "soft" conditions on complexing ions in solutions and in biological systems, as well as high sensitivity spectral-luminescence characteristics to changes in the structure of the chromophore and the nature of the solvent. Systematic observation of photochemical and photophysical properties and establishment of their connection with structural features of the complexes are required for successful usage of dipyrromethene complexes and creation of various hi-tech optical devices which are based on them. Therefore, the purpose of the work is to study the spectral-luminescent properties and stability in protic media of different complexes of dipyrromethenes with zinc the optimal combination of which will indicate the direction of the most effective use of these dyes. For successful application of such complexes need to know something of their behaviors in different solvents, including when acids and alkalides are present, since the stabilities of fluorophores in acidic/alkaline media are closely related to their applicabilities. The complexes stabilities in the ground and excited states are estimated by spectrophotometric titration of ethanol solutions of compounds using water-ethanol solutions of hydrochloric acid.