TY  - JOUR
A1  - Haubitz, Toni
A1  - John, Leonard
A1  - Freyse, Daniel
A1  - Wessig, Pablo
A1  - Kumke, Michael Uwe
T1  - Investigating the Sulfur "Twist" on the Photophysics of DBD Dyes
T2  - The journal of physical chemistry : A, Molecules, spectroscopy, kinetics, environment & general theory
N2  - The so-called DBD ([1,3]dioxolo[4,5-f][1,3]benzodioxole) dyes are a new class of fluorescent dyes, with tunable photophysical properties like absorption, fluorescence lifetime, and Stokes shift. With the development of sulfur based DBDs, this dye class is extended even further for possible applications in spectroscopy and microscopy. In this paper we are investigating the basic photophysical properties and their implications for future applications for S-4-DBD as well as O-4-DBD. On the basis of time-resolved laser fluorescence spectroscopy, transient absorption spectroscopy, and UV/vis-spectroscopy, we determined the rate constants of the radiative and nonradiative deactivation processes as well as the energy of respective electronic states involved in the electronic deactivation of S-4-DBD and of O-4-DBD. For S-4-DBD we unraveled the triplet formation with intersystem crossing quantum yields of up to 80%. By TD-DFT calculations we estimated a triplet energy of around 13500-14700 cm(-1) depending on the DBD dye and solvent. Through solvent dependent measurements, we found quadrupole moments in the range of 2 B.
Y1  - 2020
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/57109
SN  - 1089-5639
SN  - 1520-5215
VL  - 124
IS  - 22
SP  - 4345
EP  - 4353
PB  - American Chemical Society
CY  - Washington
ER  -