Just a Proton: Distinguishing the Two Electronic States of Five-coordinate High-spin Iron(II) Porphyrinates with Imidazole/ate Coordination

Overview

Journal J Am Chem Soc

Publisher American Chemical Society

Specialty Chemistry

Date 2010 Mar 3

PMID 20192189

Citations 13

Authors

Chuanjiang Hu

Corinne D Sulok

Florian Paulat

Nicolai Lehnert

Anna I Twigg

Michael P Hendrich

Charles E Schulz

W Robert Scheidt

Affiliations

Soon will be listed here.

Abstract

We report detailed studies on two S = 2 electronic states of high-spin iron(II) porphyrinates. These two states are exemplified by the five-coordinate derivatives with either neutral imidazole or anionic imidazolate as the axial ligand. The application of several physical methods all demonstrate distinctive differences between the two states. These include characteristic molecular structure differences, Mossbauer spectra, magnetic circular dichroism spectroscopy, and integer-spin EPR spectral distinctions. These distinctions are supported by DFT calculations. The two states are characterized by very different spatial properties of the doubly occupied orbital of the high-spin that are consonant with the physical properties.

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