Photophysics of organometallic platinum(II) derivatives of the diketopyrrolopyrrole chromophore
Type
ArticleAuthors
Goswami, SubhadipWinkel, Russell W.
Alarousu, Erkki
Ghiviriga, Ion
Mohammed, Omar F.

Schanze, Kirk S.
KAUST Department
Chemical Science ProgramKAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
Date
2014-12-05Online Publication Date
2014-12-05Print Publication Date
2014-12-18Permanent link to this record
http://hdl.handle.net/10754/563925
Metadata
Show full item recordAbstract
A pair of diketopyrrolopyrrole (DPP) chromophores that are end-functionalized with platinum containing "auxochromes" were subjected to electrochemical and photophysical study. The chromophores contain either platinum acetylide or ortho-metalated 2-thienylpyridinyl(platinum) end-groups (DPP-Pt(CC) and DPP-Pt(acac), respectively). The ground state redox potentials of the chromophores were determined by solution electrochemistry, and the HOMO and LUMO levels were estimated. The chromophores' photophysical properties were characterized by absorption, photoluminescence, and time-resolved absorption spectroscopy on time scales from sub-picoseconds to microseconds. Density functional theory (DFT) computations were performed to understand the molecular orbitals involved in both the singlet and triplet excited state photophysics. The results reveal that in both platinum DPP derivatives the organometallic auxochromes have a significant effect on the chromophores' photophysics. The most profound effect is a reduction in the fluorescence yields accompanied by enhanced triplet yields due to spin-orbit coupling induced by the metal centers. The effects are most pronounced in DPP-Pt(acac), indicating that the orthometalated platinum auxochrome is able to induce spin-orbital coupling to a greater extent compared to the platinum acetylide units. (Figure Presented).Citation
Goswami, S., Winkel, R. W., Alarousu, E., Ghiviriga, I., Mohammed, O. F., & Schanze, K. S. (2014). Photophysics of Organometallic Platinum(II) Derivatives of the Diketopyrrolopyrrole Chromophore. The Journal of Physical Chemistry A, 118(50), 11735–11743. doi:10.1021/jp509987pSponsors
This work was supported by the National Science Foundation (Grant No. CHE-1151624). The ultrafast spectroscopy was carried out with support from the King Abdullah University of Science and Technology.Publisher
American Chemical Society (ACS)ae974a485f413a2113503eed53cd6c53
10.1021/jp509987p