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Methods and Equipment: H and 13C NMR spectra were measured
1
on a 400 MHz Bruker Avance III instrument. H NMR spectra of
all relevant compounds are shown in the Supporting Information
(Figures S1–S9). High-resolution mass spectrometry was per-
formed with a Bruker maxis 4G QTOF ESI spectrometer. Low-
resolution mass spectra were measured on a Bruker esquire 3000
plus instrument. Elemental analysis occurred with a Varia Micro
Cube instrument from Elementar and was conducted by Ms. Sylvie
Mittelheisser in the Department of Chemistry at the University of
Basel. A Cary 5000 UV/Vis-NIR spectrophotometer from Varian
was employed for optical absorption spectroscopy, and a Fluoro-
log-322 instrument from Horiba Jobin–Yvon was used for steady-
state luminescence spectroscopy. Time-resolved luminescence and
transient absorption spectroscopy was performed with an LP920-
KS spectrophotometer from Edinburgh Instruments using the fre-
quency-doubled output of a Quantel Brilliant b laser for excitation
and either a R928 photomultiplier tube or an iCCD camera from
Andor for detection. The duration of the laser pulses was approxi-
mately 10 ns and the pulse frequency was 10 Hz. Transient absorp-
tion (difference) spectra were time-averaged over a duration of
200 ns. Quartz cuvettes from Starna were used for all optical spec-
troscopic studies. Cyclic voltammetry was performed in a conven-
tional setup with three electrodes using a Versastat3-200 potentios-
tat from Princeton Applied Research. A glassy carbon disk served
as a working electrode, and two silver wires were used as counter
and quasi-reference electrodes, respectively. Internal potential cali-
bration occurred by addition of small amounts of ferrocene. The
measurements were performed in dry acetonitrile with 0.1 m tetra-
butylammonium hexafluorophosphate (TBAPF6) as supporting
electrolyte.
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Acknowledgments
This work was supported by the Swiss National Science Founda-
tion through grant number 200021_156063/1. Support from the
European Union, COST action, CM1202, PERSPECT-H2O is
acknowledged.
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