Push�pull structures of symmetric silane derivatives as a novel hosting materials

Dorota Zajac; Jadwiga Soloducho; Tomasz Jarosz; Mieczys?aw ?apkowski; Szczepan Roszak

Volume : VII, Issue : I, January - 2017

Push�pull structures of symmetric silane derivatives as a novel hosting materials

Dorota Zajac, Jadwiga Soloducho, Tomasz Jarosz, Mieczys Aw Apkowski, Szczepan Roszak

Abstract :

: Silane–based symmetric (4a–g, 9a–c) conjugated systems including electron rich heterocycle rings were designed and efficiently synthesized by the Suzuki/Stille condensation and Ullmann reaction. The structures characterize with a comparatively small band gaps and indicate deep absorption in the region 230–500 nm. Moreover, synthesized derivatives reveal light emission in practically the whole visible light. The electrochemical survey disclosed the onset of the oxidation signal was found at relatively low potentials. The band gap (1.55 eV – 2.64 eV) creates the structures potentially suitable as a hosting medium for emitters. The lowest electrochemical and optical band gap describes dithienosiloles, the largest – structure with tetraphenylsilane group. The electrochemical character of dithienosilole/tetraphenylsilane blocks was also certified by EPR as well as theoretical studies. The calculations explains the contrast between electrochemical and optical experimentally estimated energy gaps.