A series of novel functional monomers containing thiophene and 2

3-substituted indoles were designed and synthesized. Their structures were confirmed by GPC and FTIR. The results of TGA and electrochemical analysis showed that by introducing the electron-absorbing groups into the indole part

the thermal stability of the polymer could be improved and the energy gap of the polymer could be enlarged. The results of UV-vis and fluorescence emission spectroscopy showed that the donor-acceptor effect

the chain-to-chain interaction and the π-π stacking interaction together lead to different spectroscopic phenomena of polymers

emitting fluorescence with different colors such as red

orange-red

light red

blue-green

yellow and brown

which can effectively avoid the fluorescence interference of cells

and showed good application potential.