Title

Relativistic Effects in Iron-, Ruthenium-, and Osmium Porphyrins

Document Type

Article

Journal/Book Title

Chemical Engineering Science

Publication Date

12-2002

Publisher

Elsevier

Volume

285

Issue

2-3

First Page

195

Last Page

206

DOI

10.1016/S0301-0104(02)00836-4

Abstract

Nonrelativistic and relativistic DFT calculations are performed on four-coordinate metal porphyrins MP and their six-coordinate adducts MP(py)2 and MP(py)(CO) (py=pyridine) with M=Fe, Ru, and Os. The electronic structures of the MPs are investigated by considering all possible low-lying states with different configurations of nd-electrons. FeP and OsP have a ground state, while this state is nearly degenerate with for RuP. Without relativistic corrections, the ground states of both RuP and OsP would be . For the six-coordinate adducts with py and CO, the strong-field axial ligands raise the energy of the M dz2-orbital, thereby making the MII ion diamagnetic. The calculated redox properties of MP(py)2 and MP(py)(CO) are in agreement with experiment. The difference between RuP(py)(CO) and OsP(py)(CO), in terms of site of oxidation, is due to relativistic effects.

Comments

http://www.sciencedirect.com/science/article/pii/S0301010402008364

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Published by Elsevier in Chemical Engineering Science.

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