Аннотация:Two novel aromatic compounds containing thieno[2',3':4,5]thieno[3,2-b]thieno[2' ' ,3' ':4' ,5']thieno[2' ,3':4,5]pyrrolo[3,2-g]indole as the electron-donating center and terminal 3-(dicyanomethylene)indan-1-one (or 5,6-difluoro analogue) electron-accepting groups exhibit efficient light absorption in the red and near-infrared spectral regions, have low levels of the highest occupied molecular orbital (up to –5.65 eV) and lowest unoccupied molecular orbital (–3.91 eV) and a relatively low band gap value (up to 1.74 eV). The optical, thermal and structural properties are explored and compared with those of their closest and well known analogues, Y5 and Y6.The work was financially supported by the Russian Science Foundation (grant no. 21-43-00051). NMR and UV-visible spectra were recorded using the equipment of the Collaborative Access Center ‘Center for Polymer Research’ ISPM RAS withfinancial support of the Ministry of Science and Higher Education of the Russian Federation (subject FFSM-2021-0005). The authors are grateful to O. A. Maloshitskaya for help in recordingMALDI-TOF spectra and N. M. Surin for help in recording absorption spectra.
