1. A new kind of pendant viologen polymer, PVSEO21, which had electrochromic behavior and solid electrolyte property, was synthesized.

2. The alkyl groups of viologen compounds influence the reduction potentials and the film forming property of reduced products on the electrode.

3. A new coupling electrochromic solution was investigated by introducing titanium ion into viologen solution.

4. In DMSO-H2O mixture, using TPP and metal TPP's as sensitizers, EDTA as electron donor, methyl viologen was reduced to the blue methyl viologen cation radical upon irradiation with white light.

5. This first-year study is about the exploration and analysis on the electrochromic properties of poly(butyl viologen) (PBV) thin films.