Ziabrev K. Polymethine dyes based on 2,2-difluoro-1,3,2(2H)dioxaborines, which derived from 1,3-diketones of alycyclic compounds and barbituric acid. Synthesis, electronic structure and spectral properties

The dissertation is devoted to synthesis of new types dioxa- and oxazaborines as well as polymethine dyes based on the later and investigation of electronic structure and spectral properties new chelate dyes. Theoretical and experimental study shown that symmetrical polymethines with a dioxaborine end groups are anionic dyes with notably stabilized frontal levels. This stabilization, just as charge equalization on the adjacent oxygen atoms, caused by О,О-chelating of the -BF2 group. The spectral properties of the new symmetrical dyes with hydrocarbon bridge groups derived from 2,2-difluoro-4-pheny-1,3,2(2H)dioxaborines were investigated. The regularities of colour of the new 2,2-difluoro-1,3,2(2H)dioxaborines dyes depending on structure of an polymethine chain and electronacceptor properties of an ligand in an boron chelate were founded. Synthesis of 2,2-difluoro-1,3,2(2H)dioxaborine analogs in which one of oxygen atom replaced by NH- or NPh-group as well as mesoionic dyes based on the new chelates waselaborated