Jump to main content
Jump to site search

Issue 7, 1996

Electronic structure of thiaporphyrins: an X-ray photoelectron spectroscopic study

Abstract

The electronic structure of 5,10,15,20-tetraphenylporphyrin (H2tpp) modified with one and two sulfur core atoms has been investigated by X-ray photoelectron spectroscopy (XPS). The nitrogen Is binding energies (b.e.s) were excellent sensors of the electronic effects of the core-modified porphyrins. They clearly show that there is an increase in electron density on the core nitrogen atoms when the two NH groups in H2tpp are replaced by sulfur atoms, the nitrogen 1s b.e. decreasing by about 1.5 eV. The carbon 1s core level also decreases in b.e. on core modification with sulfur atoms. The results obtained are in good agreement with those from UV/VIS, fluorescence spectroscopy, electrochemical studies, X-ray diffraction and extended-Hückel calculations. They indicate that there is an interaction between the nitrogen and sulfur atoms and a mechanism is suggested for it. No evidence was found for interaction among sulfur atoms and the participation of their d orbitals in the electronic structure. Copper and nickel complexes of the monothiaporphyrin were also subjected to XPS analysis.

Article information


J. Chem. Soc., Dalton Trans., 1996, 1255-1259
Article type
Paper

Electronic structure of thiaporphyrins: an X-ray photoelectron spectroscopic study

C. S. Gopinath, R. P. Pandian and P. T. Manoharan, J. Chem. Soc., Dalton Trans., 1996, 1255 DOI: 10.1039/DT9960001255

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Search articles by author

Spotlight

Advertisements