Chemistry Letters, Vol.42, No.9, 1004-1006, 2013
Preparation, Properties, and X-ray Structures of Bis(10-methyl-9-methyleneacridan)-type Electron Donors with a Thiophene, Bithiophene, or Terthiophene Skeleton: Redox Switching of Thiophene-Thienoquinoid Structure Accompanied by UV-vis-NIR Electrochromic Response
The newly designed title dyes 1-3 have a thiophene-type pi-skeleton, to which two methyleneacridan subunits are attached as electron-donating end groups. They undergo reversible one-wave 2e-oxidation to the corresponding dications containing a thienoquinoid moiety. The redox and spectral properties can be modified by changing the pi-skeleton, and bithiophene 2 and terthiophene 3 can serve as new entries of UV-vis-NIR. electrochromic materials.