Photophysical properties of thiophenes and 2,2′-bithiophenes containing alicyclic moieties
作者:Violetta V. Meshkovaya、Alexander V. Yudashkin、Yuri N. Klimochkin
DOI:10.1016/j.dyepig.2014.09.013
日期:2015.2
A series of novel 1-hydroxycycloalkyl- and cycloalkenylthiophenes (4a-4c, 4e, 6b, 6d, 6e) and bithiophenes (5a-5e, 7b-7e) were synthesized via Grignard reaction. The conditions control in the Grignard reaction allowed to obtain tertiary alcohols or cycloalkenes selectively. The Vilsmeier-Haack formylation of thiophenes and 2,2'-bithiophenes with alicyclic fragment C-4-C-5 results formation of unsaturated aldehydes whereas cycloalkenes C-6 form 5'-formylbithiophenes as the main isomers. The photophysical properties such as absorption and fluorescence spectra were recorded in different solvents, and relative quantum yields of aldehydes (9a, 9b, 11c-11e) and corresponding carbonitriles (13a, 13b, 15c-15e) were measured. The synthesized compounds showed an intense fluorescence in the 400-520 nm range, moderate quantum yields and large Stokes' shifts values. (C) 2014 Elsevier Ltd. All rights reserved.