Tetraphenylporphyrin, [TPP]

This page summarizes the optical absorption and emission data of Tetraphenylporphyrin, [TPP] that is available in the PhotochemCAD package, version 2.1a (Du 1998, Dixon 2005). I reworked their data to produce these interactive graphs and to provide direct links to text files containing the raw and manipulated data. Although I have tried to be careful, I may have introduced some errors; the cautious user is advised to compare these results with the original sources.

You can resize any of the graphs by clicking and dragging a rectangle. If you hover the mouse over the graph, you will see a pop-up showing the coordinates. One of the icons in the upper right corner will let you export the graph in other formats.

Absorption

This optical absorption measurement of Tetraphenylporphyrin, [TPP] 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 18,900cm^-1/M at 515.0nm (Barnett, 1975).

Original Data | Extinction Data

Fluorescence

The fluorescence emission spectrum of Tetraphenylporphyrin, [TPP] dissolved in toluene. The excitation wavelength was 514nm. The quantum yield of this molecule is 0.11 (Seybold, 1969a). 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.

Original Data | Emission Data

Notes

Other extinction coefficient values include 470,000 cm^-1/M (Badger, 1964; Kim, 1972) and 370,000 (Albers, 1936).

References

Albers, V. M. and H. V. Knorr (1936) Spectroscopic studies of the simpler porphyrins. I. The absorption spectra of porphin, ms-methyl porphin, ms-ethyl porphin, ms-propyl porphin and ms-phenyl porphin. J. Chem. Phys. 4, 422-425.

Badger, G. M., R. A. Jones and R. L. Laslett (1964) Porphyrins. VII. The synthesis of porphyrins by the Rothemund reaction. Aust. J. Chem. 17, 1028-1035.

Barnett, G. H., M. F. Hudson and K. M. Smith (1975) Concerning meso-tetraphenylporphyrin purification. J. Chem. Soc. Perkin Trans. I 1401-1403.

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.

Kim, J. B., J. J. Leonard and F. R. Longo (1972) A mechanistic study of the synthesis and spectral properties of meso-tetraphenylporphyrin. J. Am. Chem. Soc. 94, 3986-3992.