| Title | Synthesis and characterization of strongly two photon absorbing and photoswitchable azo molecules |
| Publication Type | Journal Article |
| Year of Publication | 2015 |
| Authors | Breukers, R.D., Janssens S., Raymond S.G., Bhuiyan M.D.H., and Kay A.J. |
| Journal | Dyes and Pigments |
| Volume | 112 |
| Pagination | 17 - 23 |
| Date Published | 2015 |
| ISSN | 01437208 (ISSN) |
| Keywords | Azo dyes, Chromophores, Fluorenes, Isomerization, Molecules, Phenylene, Photo-switching, Photons, Synthesis (chemical), Two photon absorption, Two photon processes, Z-scan |
| Abstract | Here we describe the synthesis and characterization of a range of symmetric two photon absorbing chromophores containing photoswitchable Disperse Red-type donors. These have been incorporated into D-π-D molecules with 1-(2-ethylhexyloxy)-4-methoxybenzene and 9,9-bis(2-ethylhexyl)-fluorene π-cores, and D-π-A-π-D molecules based on a (2,6-dimethyl-pyran-4- ylidene)propanedinitrile acceptor core. The TPA cross section measured by z-scan at 780 nm was up to 298 GM for the D-π-A-π-D molecules and up to 1250 GM for the molecules with D-π-D architectures. As all of the compounds have azo groups as part of the π linker the cis/trans isomerisation of these materials was also explored. It is found that dyes based on the D-π-D architecture are more amenable to isomerisation and are also more stable in the cis form when compared to D-π-A-π-D chromophores. © 2014 Elsevier Ltd. All rights reserved. |
| URL | http://www.scopus.com/inward/record.url?eid=2-s2.0-84903974000&partnerID=40&md5=915bb402e03dfa7d3d40f354a40ddd38 |
| DOI | 10.1016/j.dyepig.2014.06.019 |
