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This optical absorption measurement of Porphin were made by J. Li on 12-11-1997 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 261,000cm-1/M at 396.3nm (Eisner, 1955).
The fluorescence emission spectrum of Porphin dissolved in toluene. The excitation wavelength was 396nm. The quantum yield of this molecule is 0.043 (Gradyushko, 1970). This spectrum was collected by on 12-11-1997 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.
Dixon, J. M., M. Taniguchi and J. S. Lindsey (2005), "PhotochemCAD 2. A Refined Program with Accompanying Spectral Databases for Photochemical Calculations, Photochem. Photobiol., 81, 212-213.
Du, H., R.-C. A. Fuh, J. Li, L. A. Corkan and J. S. Lindsey (1998) PhotochemCAD: A computer-aided design and research tool in photochemistry. Photochem. Photobiol. 68, 141-142.
Eisner, U. and R. P. Linstead (1955) Chlorophyll and related compounds. Part II. The dehydrogenation of chlorin to porphin and the number of extra hydrogen atoms in the chlorins. J. Chem. Soc. 3749-3754.
Gradyushko, A. T., A. N. Sevchenko, K. N. Solovyov and M. P. Tsvirko (1970) Energetics of photophysical processes in chlorophyll-like molecules. Photochem. Photobiol. 11, 387-400.