Univerzita PardubiceFakulta chemicko- technologická

Univerzita Pardubice

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Publikace detail

4,5-DICYANOIMIDAZOLE AND 2,3-DICYANOPYRAZINE ACCEPTOR UNITS IN PUSH-PULL CHROMOPHORES

Autoři: Bureš Filip

Rok: 2012

Druh publikace: ostatní - přednáška nebo poster

Strana od-do: nestránkováno

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
eng	4,5-DICYANOIMIDAZOLE AND 2,3-DICYANOPYRAZINE ACCEPTOR UNITS IN PUSH-PULL CHROMOPHORES	Organic p-conjugated systems end-capped with suitable donors and acceptors are intensively studied for their optical nonlinearities (NLO), in particular their high second- and third-order polarizabilities. A typical organic D-p-A chromophore consists of strong electron-donors D (e.g. NR2 or OR) and strong electron acceptors A (e.g. NO2 or CN) connected by a p-linker. Modern organic NLO-active D-p-A systems differ mainly in the p-linker assuring charge-transfer (CT) from the donor to the acceptor moieties. Thus, chromophores with p-conjugated path featuring double/triple bonds, aromates, and heteroaromates belong currently to the most studied organic compounds in this respect. Recently, we have utilized cyano-substituted imidazole and pyrazine rings as suitable and efficient p-conjugated acceptor units for the construction of NLO-active push-pull systems 1-2 [1-8]. Dimethylamino donors were appended either directly to the parent heterocycle or were separated by systematically extended p-linkers to tune opto-electronic properties (Scheme 1). The synthesis, characterization, electrochemical, spectral and NLO properties as well as structure-property relationships on such systems will be discussed.	chromofor; imidazol; pyrazin, nlo