Abstract
The electronic effects of a wide variety of peripheral substituents in free base prophyrins have been evaluated using X-ray photoelectron spectroscopy (XPS) and all-electron ab initio calculations. Both methods have identified the 1s energies of the central nitrogens as excellent sensors of the electronic effects of peripheral substituents. Core level photoelectron spectra are reported fornine porphyrins, including unsubtituted prophyrin, octaethylporphyrin, and seven tetraphenylporphyrins
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