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peak areas versus internal standard. Quantum yields were
determined by valerophenone actinometry.40
1
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Laser Flash Photolysis Experiments. Laser flash photolysis
experiments employed the pulses (308 nm, ca. 80 mJ/pulse, 20
ns) from a Lambda Physik Lextra 50 excimer laser or a Lambda
Physik FL 3002 dye laser (Stilbene 420, 420 nm, ca. 2 mJ/
pulse, 20 ns) and a computer-controlled system which has been
described elsewhere.41 The dye laser was pumped by the
excimer laser. Solutions of the Rh(III) complexes were prepared
such that the absorbance at the excitation wavelength was ca.
0.3. Transient absorption spectra were recorded employing a
Suprasil quartz flow cell (1 × 1 cm2) and a flow system to
ensure that a fresh volume of sample was irradiated by each
laser pulse. Quenching rate constants were measured using
argon-saturated static samples contained in 1 × 1 cm2 Suprasil
quartz cells.
Acknowledgment. The authors thank the National Science
Foundation for generous support of this research and C. Turro
for the preparation of the rhodium complexes. G.W.S. thanks
NSERC (Canada) for a postdoctoral fellowship.
Supporting Information Available: Ground-state and tran-
sient UV-vis absorption spectra of the two Rh(III) sensitizers
3+
and a representative kinetic decay trace of the Rh(phen)3
excited state generated by LFP (5 pages). See any current
masthead page for ordering information.
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