PMID- 31315394 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20190923 IS - 1520-6904 (Electronic) IS - 0022-3263 (Linking) VI - 84 IP - 16 DP - 2019 Aug 16 TI - Synthesis of Bis([2,2'-bithiophen]-5-yl)-Substituted Oligothiadiazoles: Effect of the Number of Acceptor Units on Electrochemical and Spectroscopic Properties. PG - 10040-10049 LID - 10.1021/acs.joc.9b01216 [doi] AB - 1,3,4-Thiadiazole, 2,2'-bi(1,3,4-thiadiazole), 2,2':5',2''-ter(1,3,4-thiadiazole), and 2,2':5',2'':5'',2'''-quater(1,3,4-thiadiazole) symmetrically disubstituted with 3-alkyl-(2,2'-bithiophen)-5-yl were synthesized by new procedures using readily available ethyl 3-alkyl-(2,2'-bithiophene)-5-carboxylate as a convenient substrate. These new compounds with a fixed number of donor rings and increasing number of acceptor rings showed very interesting, tunable redox properties. In particular, they exhibited electron affinities (EAs) ranging from -3.06 to -3.83 eV, reaching EA values desired for air-operating n-type organic semiconductors. Their electrochemically determined ionization potentials were only moderately dependent on the number of thiadiazole rings, varying from 5.83 to 6.01 eV. Emission spectra of these compounds could also be tuned in a wide range (from 470 to 600 nm). Spectroscopic and electrochemical data were confirmed by density functional theory calculations demonstrating full consistency. FAU - Kostyuchenko, Anastasia S AU - Kostyuchenko AS AD - Laboratory of New Organic Materials , Omsk State Technical University , Mira ave. 11 , Omsk 644050 , Russian Federation. FAU - Kurowska, Aleksandra AU - Kurowska A AD - Faculty of Chemistry , Silesian University of Technology , Marcina Strzody 9 , Gliwice 44-100 , Poland. FAU - Zassowski, Pawel AU - Zassowski P AD - Faculty of Chemistry , Silesian University of Technology , Marcina Strzody 9 , Gliwice 44-100 , Poland. FAU - Zheleznova, Tatyana Yu AU - Zheleznova TY AD - Department of Organic Chemistry , Omsk F. M. Dostoevsky State University , Mira ave. 55A , Omsk 644077 , Russian Federation. FAU - Ulyankin, Evgeny B AU - Ulyankin EB AD - Department of Organic Chemistry , Omsk F. M. Dostoevsky State University , Mira ave. 55A , Omsk 644077 , Russian Federation. FAU - Domagala, Wojciech AU - Domagala W AUID- ORCID: 0000-0002-8885-729X AD - Faculty of Chemistry , Silesian University of Technology , Marcina Strzody 9 , Gliwice 44-100 , Poland. FAU - Pron, Adam AU - Pron A AD - Faculty of Chemistry , Warsaw University of Technology , Noakowskiego 3 , Warszawa 00-664 , Poland. FAU - Fisyuk, Alexander S AU - Fisyuk AS AUID- ORCID: 0000-0001-6191-9297 AD - Laboratory of New Organic Materials , Omsk State Technical University , Mira ave. 11 , Omsk 644050 , Russian Federation. LA - eng PT - Journal Article DEP - 20190801 PL - United States TA - J Org Chem JT - The Journal of organic chemistry JID - 2985193R SB - IM EDAT- 2019/07/19 06:00 MHDA- 2019/07/19 06:01 CRDT- 2019/07/19 06:00 PHST- 2019/07/19 06:00 [pubmed] PHST- 2019/07/19 06:01 [medline] PHST- 2019/07/19 06:00 [entrez] AID - 10.1021/acs.joc.9b01216 [doi] PST - ppublish SO - J Org Chem. 2019 Aug 16;84(16):10040-10049. doi: 10.1021/acs.joc.9b01216. Epub 2019 Aug 1.