Electrochromic material based on a conducting ladder polymer
US6127516A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1998 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Dec 30, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K9/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The oxidation of 7,14-diphenylacenaphtho[1,2-.kappa.]fluoranthene (1) at platinum or indium tin-oxide electrodes leads to deposition of a polymer film on the electrode surface that displays many interesting properties including electroactivity, fluorescence, and electrochromism. Thin films of this polymer appear deep blue in the neutral state, but become pale grey upon oxidation and light green or orange upon reduction, depending upon the voltage applied. Soluble oligomers of poly(3,10-(7,14-diphenylacenaphtho[1,2-.kappa.]fluoranthene)) are formed during oxidation of the monomer (1) via radical cation-radical cation coupling reactions and are identical to those chemically synthesized by the Ni(0)-catalyzed coupling of the 3,10-dibromo derivative of 1. Further oxidation of these oligomers leads to intramolecular coupling reactions to form ladder structures within the chains and the eventual precipitation of insoluble polymer onto the electrode. Spectroscopic and electrochemical data for the polymer film and the isolated oligomers is presented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.