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This optical absorption measurement of Zinc tetraphenylporphyrin, [ZnTPP] were made by R. W. Wagner in 1994 using a Cary 3. The absorption values were collected using a spectral bandwidth of 1.0 nm, a signal averaging time of 0.133 sec, a data interval of 0.25 nm, and a scan rate of 112.5 nm/min.
These measurements were scaled to make the molar extinction coefficient match the value of 574,000cm-1/M at 422.8nm (Barnett, 1975).
The fluorescence emission spectrum of Zinc tetraphenylporphyrin, [ZnTPP] dissolved in toluene. The excitation wavelength was 550nm. The quantum yield of this molecule is 0.033 (Strachan, 1997). This spectrum was collected by in 1994 using a Spex FluoroMax. The excitation and emission monochromators were set at 1 mm, giving a spectral bandwidth of 4.25 nm. The data interval was 0.5 nm and the integration time was 2.0 sec.
Samples were prepared in 1cm pathlength quartz cells with absorbance less than 0.1 at the excitation and all emission wavelengths to uniformly illuminate across the sample, and to avoid the inner-filter effect. The dark counts were subtracted and the spectra were corrected for wavelength-dependent instrument sensitivity.
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