Synthesis And Characterization Of Novel Benzo[b]disilole And Conjugated Polymers Based On It: Polymerization And Characterization

Silole derivatives become more and more attractive because of their excellent properties, such as good electron affinity and high electric migration rate. In this thesis, a novel benzo[b]disilole functional monomer was designed, synthesized and characterized successfully. The molecular frontier orbital of a series of aromatic-fused-disilole, including benzo[b]disilole was calculated via Gaussian calculation and analyzed. Furthermore, a series of novel D-A type conjugated polymers containing benzo[b]disilole was fabricated and characterized.(1) A novel benzo[b]disilole was designed, synthesized, calculated and characterized. UV-vis spectra showed this benzo[b]disilole behaved a special three-peak-absorbance: there are three maximum absorbance peaks at 302 nm, 313 nm and 344 nm, respectively. This is a unique UV-vis absorbance that has not been reported yet.(2) A series of D-A type conjugated polymers(P1/1-P1/3) containing the benzo[b]disilole and 4,7-Dithiony-2,1,3-benzonthiodizole(DTBT) were synthesized. They behaved good properties in thermal stability and chloroform solubility, In comparison with the typical conjugated polymers containing benzo[b]dithiophene unit, P1/1-P1/3 behaved a more efficient absorbance from 300 nm to 450 nm.(3) A series of new conjugated polymers(P2/1-P2/5) by introducing other donor, 7,8-DiThionyl-2,5-benzo[b:1,2-b’:4,5]dithiophene(DTBDT), into P1/1-P1/3 was designed and synthesized. The experimental results showed the electronic properties of these polymers were depended on the ratio of silole, DTBDT and acceptor from 300 nm to 450 nm in UV –vis spectra.