Abstract
Through the condensation of 2,5-diaminothiophene-3,4-dicarbonitrile with thiophene-2-carbaldehyde, a new homologue of azomethine-based compounds was achieved. The newly synthesized 2,5-bis-[(thiophen-2-ylmethylene)amino]thiophene-3,4-dicarbonitrile consists of three thiophene cores showing structural similarity to terthiophene, which is commonly employed as a part of the active layers in organic semiconductors. Additionally, the imine linkage (–HC = N–) affects the planar arrangement of the compound, enhancing the effective π-conjugation. As a result, the proximity of FMO (frontier molecular orbitals) of value 3.60 eV between the highest occupied and lowest unoccupied molecular orbital according to the DFT approach (Gamess, B3LYP/6-31g(d,p)), is achieved within the strategy of synthesis of small molecule-based organic semiconductors. The vicinal cyano groups at the Cβ-position of the central thiophene core offer the possibilities of further cyclization towards phthalocyanines and subphthalocyanines.
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Acknowledgements
Financial supports from the Slovak Ministry of Education, Science, Research and Sport under the contract no. VEGA 2/0055/21 and the Slovak Research and Development Agency APVV-17-0513 is gratefully acknowledged. The work was also financially supported by a grant of University of SS Cyril and Methodius with the project number UCM FPPV 22-2022.
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Gašparová, M., Kabaňová, N., Tokár, K. et al. Novel type of azomethine with combined effects of thiophene cores and vicinal cyano groups. Monatsh Chem 153, 1099–1105 (2022). https://doi.org/10.1007/s00706-022-02993-x
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DOI: https://doi.org/10.1007/s00706-022-02993-x