Successful bifunctional photoswitching and electronic communication of two platinum(II) acetylide bridged dithienylethenes.
Coordinating two dithienylethenes to a platinum center results in the reversible ring closure of both photochromic units in a model for a photoresponsive pi-conjugated polymer. This system demonstrates how metal-sensitized photochemistry, from a triplet excited state, circumvents the problems associated with other multicomponent photochromic systems, where significant electronic interactions in the ground state and singlet excited state prevent full photoswitching. Changes in charge-transfer behavior based upon conversion of both dithienylethenes to their ring-closed forms illustrate how photomodulation of conductivity through a conjugated polymer might be achieved using Pt-bis(acetylide)s.
Roberts
Matthew N
MN
Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
Carling
Carl-Johan
CJ
Nagle
Jeffrey K
JK
Branda
Neil R
NR
Wolf
Michael O
MO