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Nonlinear optoelectronic materials formed by push-pull (bi)thiophene derivatives functionalized with di(tri)cyanovinyl acceptor groups
Authors: Wojciechowski A. | Raposo M. Manuela M. | Castro M. Cidalia R. | Kuznik W. | Fuks-Janczarek I. | Pokladko-Kowar M. | Bureš Filip
Year: 2014
Type of publication: článek v odborném periodiku
Name of source: Journal of Materials Science: Materials in Electronics
Publisher name: Springer
Page from-to: 1745-1750
Titles:
Language Name Abstract Keywords
cze Nelineární optoelektronické materiály na bázi push-pull derivátů (bi)thiofenu nesoucího di(tri)kyanvinyl akceptorní skupiny Prvně byly připraveny nové nelineární optické chromofory nesoucí di(tri)kyanvinyl akceptorní jednotku vázanou na (bi)thiofen donorní jednotku, a to v metakrylátové matrici účinkem 1,064 nm laseru pracujícího v 20 ns pulzním režimu. Byla naměřena jejich absorpční spektra a provedeny DTF kalkulace. charge-transfer chromofory;vztahy struktura-reaktivity;oligothiofeny;knoevenagelova kondenzace;donor;absorpce;hyperpolarizabilita;kyanethynyletheny;thienylpyrroly
eng Nonlinear optoelectronic materials formed by push-pull (bi)thiophene derivatives functionalized with di(tri)cyanovinyl acceptor groups Novel nonlinear optical (NLO) materials based on six novel NLO chromophores featuring di(tri)cyanovinyl acceptor linked to (bi)thiophene heterocyclic donor system were fabricated for the first time in polymethyl methacrylate matrices with a 1,064 nm laser working in the 20 ns time pulse regime. Absorption spectra and DFT calculations were also done. This multidisciplinary study showed that tayloring of the optical (linear and nonlinear) properties in the desired direction can be achieved by increasing the length of the pi-conjugated heterocyclic system (thiophene vs. bithiophene), the strength of the electron donor groups (H -> MeO/EtO -> Et2N) as well as the strength of the electron acceptor moieties (dicyanovinyl vs. tricyanovinyl, two vs. three electron withdrawing cyano groups). Due to the relatively high and tunable second-order susceptibilities (0.08-6.45 pm/V at wavelength 1,064 nm), the studied push-pull chromophores can be denoted as promising second-order NLO chromophores. charge-transfer chromophores; structure-property relationships; substituted oligothiophenes; knoevenagel condensation; optical nonlinearities; donor; absorption; hyperpolarizability; cyanoethynylethenes; thienylpyrroles

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