Tds 3012b oscilloscope

¹H, ¹⁹F{¹H}, and ¹³C{¹H} NMR spectra were recorded
in d6-DMSO on an NMR-FT
Bruker 400 or 500 MHz spectrometer. ¹H and ¹³C{¹H} NMR chemical shifts (δ) were determined relative
to residual solvent peaks with digital locking and are given in ppm.
Coupling constants are quoted in Hz. Mass spectra were obtained by
the staff at Cardiff University. The UV/vis absorption spectra were
recorded with the UV2550 spectrophotometer (Shimadzu Ltd., Japan).
The emission spectra were recorded with an FS5 spectrofluorometer
(Edinburgh Instruments, UK). The experimental lifetimes were recorded
with an OB920 luminescence lifetime spectrometer (Edinburgh Instruments,
UK), and time-correlated single photon counting (TCSPC) method was
used. Quantum yield measurements were obtained on aerated MeCN solutions
of the complexes using [Ru(bipy)₃](PF₆)₂ in aerated MeCN as a standard (Φ = 0.018).^{18 (link)}The nanosecond transient absorption spectra
were acquired on LP980
laser flash photolysis spectrometer (Edinburgh Instruments, UK). The
signal was digitized with a Tektronix TDS 3012B oscilloscope. The
samples were excited with a nanosecond pulsed laser (Surelite I-10,
USA; the wavelength is tunable in the range of 410–2400 nm).
The typical laser energy is 5 mJ per pulse. The samples were deaerated
with N₂ for 15 min prior to investigations. The data were
processed by L900 software.

The spectra were measured on an LP920 laser flash photolysis spectrometer (Edinburgh Instruments, UK). The lifetimes (obtained by monitoring the decay traces) were calculated with the LP900 software. All the solutions were purged with N₂ for 15 min before measurement and the gas flow was maintained during the measurements. The samples were excited with a nanosecond pulsed laser (Opolette™ 355II + UV nanosecond pulsed laser, typical pulse length: 7 ns. Pulse repetition: 20 Hz. Peak OPO energy: 4 mJ. The wavelength is tunable in the range of 410–2200 nm. OPOTEK, USA) and the transient signals were recorded on a Tektronix TDS 3012B oscilloscope.
The quantum yield of the triplet formation (Φ_T) was determined using the sensitizing method, which was described in detail previously.16b ,c ,54 The method is based on the use of a triplet energy acceptor (β-carotene) and a standard compound (Ru(bpy)₃Cl₂, bpy = 2,2′-bipyridine, Φ_T = 1). Using optically matched solutions of the reference and the C-1·B-1 hydrogen bonding assembly upon excitation at the same wavelength, the ΔO.D. value, the triplet–triplet energy transfer to β-carotene (K_TTET, monitored for the T₁ → T_n absorption at 515 nm), and the decay of the triplet energy donor in the absence of β-carotene (k₀) were used for calculation of the Φ_T values.