Photophysical and Photoacoustic Properties of π-Extended Curcumin Dyes. Effects of the Terminal Dimethylamino Electron-donor and the Bridging Aryl Ring.

ABSTRACT: The synthesis, photophysical and photoacoustic characterization for a series of nine π-extended quadrupolar curcumin dyes is presented. A systematic evaluation of the π-bridging unit including the p-phenyl, naphth-4-yl, thien-2-yl and hybrid 4-naphthathien-2-yl groups is presented. Furthermore, evaluation of the strongly donating donor-π-acceptor-π-donor quadrupolar dimethylamino terminated derivatives is also included. Select dyes exhibit excited state absorption at increased laser fluence which translates to the production of a nonlinear enhanced photoacoustic response. In particular, the bis-4-dimethylaminonaphtha-2-thien-5-yl curcuminBF₂ contrast agent DMA-5 exhibits an excellent molar photoacoustics (PA) emission at both low (9.4 × 10³  V M^-1 ) and hig

SUBMITTER: Borg RE 

PROVIDER: S-EPMC6328350 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature