Magnesium tetraphenylporphyrin, [MgTPP] This page summarizes the optical absorption and emission data of Magnesium tetraphenylporphyrin, [MgTPP] 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.


This optical absorption measurement of Magnesium tetraphenylporphyrin, [MgTPP] were made by R. W. Wagner on 06-25-1997 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 22,000cm-1/M at 564.0nm (Miller, 1952).

Original Data | Extinction Data


The fluorescence emission spectrum of Magnesium tetraphenylporphyrin, [MgTPP] dissolved in toluene. The excitation wavelength was 565nm. The quantum yield of this molecule is 0.15 (Strachan, 1997). This spectrum was collected by on 06-25-1997 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.

Original Data | Emission Data


The fluorescence yield has been reported to be 0.146 (Gradyushko, 1971), 0.15 (Ohno, 1985; Harriman, 1981), and 0.17 (Politis, 1982).


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.

Gradyushko, A. T. and M. P. Tsvirko (1971) Probabilities of intercombination transitions in porphyrin and metalloporphyrin molecules. Optics and Spectroscopy 31, 291-295.

Harriman, A. (1981) Luminescence of porphyrins and metalloporphyrins. Part 3. - Heavy-atom effects. J. Chem. Soc., Faraday Trans. I 77, 1281-1291.

Miller, J. R. and G. D. Dorough (1952) Pyridinate complexes of some metallo-derivatives of tetraphenylporphine and tetraphenylchlorin. J. Am. Chem. Soc. 74, 3977-3981.

Ohno, O., Y. Kaizu and H. Kobayashi (1985) Luminescence of some metalloporphins including the complexes of the IIIb metal group. J. Chem. Phys. 82, 1779-1787.

Politis, T. G. and H. G. Drickamer (1982) High pressure luminescence of metalloporphyrins in liquid solution. J. Chem. Phys. 76 (1), 285-291.

Strachan, J. -P., S. Gentemann, J. Seth, W. A. Kalsbeck, J. S. Lindsey, D. Holten and D. F. Bocian (1997) Effects of orbital ordering on electronic communication in multiporphyrin arrays. J. Am. Chem. Soc. 119, 11191-11201.