Features of the Electronic and Local Atomic Structures of Erbium Complexes of Tetraphenylporphyrin: Analysis of the Data of Photoelectron Spectroscopy and X-Ray Absorption Spectroscopy

The features of the electronic and local atomic structure of erbium metalloporphyrins Er(acac)TPPBr 8 and Er(acac)TPP and precursor tetraphenylporphyrins TPP and TPPBr 8 are studied by X‑ray photoelectron spectroscopy and X-ray absorption spectroscopy. Using photoelectron spectroscopy, the structural parameters of the Er4 d , N1 s , C1 s , O1 s , and Br3 d core levels and the valence band are determined. The change in the electronic structure of tetraphenylporphyrins with the introduction of the central erbium atom is established, which consists in a uniform redistribution of the electron density between nitrogen atoms of the pyrrole and aza groups. The effect of the addition of bromine in the meso-position of the macrocycle on the parameters of the local atomic structure of the erbium-porphyrin complex is determined from analysis of the X-ray absorption spectra, and the integer trivalent state of the metal (Er 3+ ) in rare-earth metalloporphyrins is confirmed.