Transient absorption spectroscopy porphyrins and photocatalysts

Nanosecond transient
measurements were performed with a custom laser spectrometer comprised of a Brillian Quantel laser with frequency
doubled (532 nm, 330 mJ) or tripled (355 nm, 160 mJ) option, an Applied
Photophysics xenon light source including a mod. 720 150 W lamp housing, a mod.
620 power controlled lamp supply and a mod. 03- 102 arc lamp pulser. Laser
excitation was provided at 90° with respect to the white light probe beam.
Light transmitted by the sample was focused onto the entrance slit of a SpectraKinetic monochromator
(Applied photophysics). Kinetic traces were processed by means of a Agilent digital oscilloscope. A typical pulse energy
of 2 mJ cm−2 was used.

Zn and Sn refer to the metal centre
me = Ph-CO2Me subsituent
OH = Ph-CO2H
N = pyridyl
PH and POEt = Ph-PO(OEt)2

TEOA = 5% v/v triethanolamine added to 1:1 MeCN:H2O solution
cat = 10 equiv CoNMeim added
N+ = methyl pyridinium
structures are provided in the JPEG file.