What priority area of science and technology does it correspond to: new substances and materials
Research: fundamental.
Prospect for further implementation: to be continued as fundamental.
Research level: no analogues in Ukraine.
Patent: no
What additional actions require further research: Synthesis and study of the regularities of changes in the luminescent properties of lanthanide complexes arising under the influence of various structural and topological factors of crown-containing calixarenes and sulfur-containing analogues of ethers during complex formation.
Brief description, advantages, further prospects for application.
The spectral and luminescent properties of calix[4]arenes modified with 12-crown-4(12-azacrown-4)-ether fragments, which are attached along the lower edge of the calixarene, have been studied. The compounds are characterized by intense fluorescence and phosphorescence in the region of 360-470 nm. It has been established that in the case of an aza-crown derivative, the efficiency of excitation energy transfer to the emitting levels of lanthanide ions (Eu(III), Tb(III)) decreases, which is reflected in quantum yields: 0.024 and 0.019, for Eu(III) complexes and 0.52 and 0.08 for Tb(III) complexes with 12-crown-4 and (12-azacrown-4) derivatives, respectively. As for crown ether derivatives, the most intense signal is observed for europium and terbium complexes with a 15-membered ligand, quantum yields are 0.0049 and 0.0172, respectively. Depending on the size and nature of the additional coordination center in (benzo)/azacrown ethers, extracoordination of solvent molecules occurs, which leads to an increase in nonradiative excitation energy losses and a decrease in the efficiency of 4f luminescence. It has been established that complexes of crown-substituted calixarenes, in contrast to ligands, exhibit fungicidal activity, which is the basis for further biological screening in order to search for effective antimycotic drugs.