Jump to main content
Jump to site search

Issue 4, 2009
Previous Article Next Article

Experimental charge density in an oxidized trinuclear iron complex using 15 K synchrotron and 100 K conventional single-crystal X-ray diffraction

Author affiliations

Abstract

The experimental electron density distribution in a crystal consisting of the simplest conceivable trinuclear carboxylate-bridged iron-μ3-oxo dianion with two α-picolinium cations has been determined using both synchrotron (15 K) and conventional (100 K) X-ray diffraction data. The constituent trinuclear oxo-centered molecule consists of six μ2-bridging formate groups between the iron pairs, while the axial ligand for all iron atoms is another formate group. The compound {[Fe3O(HCOO)6(HCOO)3]2−·H2O·2(α-CH3NC5H5)+}, (1) crystallizes in the monoclinic space groupP21/m with charge assisted hydrogen bonds linking the α-picolinium cations to the trinuclear groups. The chemical bonding in the weakly asymmetric Fe3O-core of 1 has been examined through the use of the quantum theory of atoms in molecules, and in combination with experimental d-orbital populations, a significant electron sharing is observed between the Fe atoms and the central oxygen. The central oxygen exhibits clear sp2 hybridization, and the iron atoms have valence shell charge concentrations in all metal–ligand bond directions. The relative bond strengths are evaluated based upon the charge density distribution and found to be in accordance with the geometrical results. Integrated group charges follow expectations from formal chemical valences.

Graphical abstract: Experimental charge density in an oxidized trinuclear iron complex using 15 K synchrotron and 100 K conventional single-crystal X-ray diffraction

Back to tab navigation

Supplementary files

Publication details

The article was received on 08 Jul 2008, accepted on 06 Oct 2008 and first published on 04 Dec 2008


Article type: Paper
DOI: 10.1039/B811576A
Dalton Trans., 2009, 664-671

  •   Request permissions

    Experimental charge density in an oxidized trinuclear iron complex using 15 K synchrotron and 100 K conventional single-crystal X-ray diffraction

    J. Overgaard, F. K. Larsen, G. A. Timco and B. B. Iversen, Dalton Trans., 2009, 664
    DOI: 10.1039/B811576A

Search articles by author

Spotlight

Advertisements