A high-spin square-planar Fe(ii) complex stabilized by a trianionic pincer-type ligand and conclusive evidence for retention of geometry and spin state in solution. Issue 1 (28th October 2014)

• Record Type: Journal Article
• Authors: Pascualini, M. E.; Di Russo, N. V.; Thuijs, A. E.; Ozarowski, A.; Stoian, S. A.; Abboud, K. A.; Christou, G.; Veige, A. S.
• Is Part Of: Chemical science. Volume 6:Issue 1(2015:Jan.)
• Page Start: 608
• Page End: 612
• Publication Date: 2014-10-28
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c4sc02634a
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : Extensive spectroscopic evaluation of a novel ONO 3− trianionic pincer Fe(ii ) complex indicates the rare square-planar geometry and S = 2 spin state are retained in solution. Abstract : Square-planar high-spin Fe(ii ) molecular compounds are rare and the only three non-macrocyclic or sterically-driven examples reported share a common FeO4 core. Using an easily modifiable pincer-type ligand, the successful synthesis of the first compound of this type that breaks the FeO4 motif was achieved. In addition, we present the first evidence that geometry and spin state persist in solution. Extensive characterization includes the first high-field EPR and variable field/temperature Mössbauer spectra for this class of compounds. Analysis of the spectroscopic data indicates this complex exhibits a large and positive zero-field splitting tensor. Furthermore, the unusually small Δ E Q value determined for this compound is rationalized on the basis of DFT calculations.