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Photophysical and Photoacoustic Properties of π ‐Extended Curcumin Dyes. Effects of the Terminal Dimethylamino Electron‐donor and the Bridging Aryl Ring
Author(s) -
Borg Raymond E.,
Hatamimoslehabadi Maryam,
Bellinger Stephanie,
La Jeffrey,
Mithila Farha,
Yelleswarapu Chandra,
Rochford Jonathan
Publication year - 2018
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.12980
Subject(s) - photoacoustic imaging in biomedicine , absorbance , excited state , aryl , electron donor , fluence , photochemistry , chemistry , fluorescence , photoacoustic effect , conjugated system , materials science , organic chemistry , optics , polymer , ion , physics , alkyl , chromatography , nuclear physics , catalysis
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 curcumin BF 2 contrast agent DMA ‐5 exhibits an excellent molar photoacoustics ( PA ) emission at both low (9.4 × 10 3 V M −1 ) and high (1.47 × 10 5 V M −1 ) laser fluence which is confirmed by its strong contrast by photoacoustic tomography (PAT). In summary, the strong absorbance and enhanced photoacoustic properties of naphthyl and thienyl curcuminoids here presented provides great promise for future photoacoustic imaging applications as demonstrated by preliminary PAT studies.