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Issue 5, 2021
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Low-spin 1,1′-diphosphametallocenates of chromium and iron

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Abstract

We report two anionic diphosphametallocenates, [K(2.2.2-crypt)][M(PC4Me4)2] (M = Cr, 2-Cr; Fe, 2-Fe). Both are low-spin (S = ½) by EPR spectroscopy and SQUID magnetometry. This contrasts the high-spin (S = [fraction three-over-two]) ferrocenate, [K(2.2.2-crypt)][Fe(C5H2-1,2,4-tBu)2] (4-Fe). Quantum chemical calculations suggest this is due to significant differences in ligand field splitting of the d-orbitals which also explain structural features in the 2-M complexes.

Graphical abstract: Low-spin 1,1′-diphosphametallocenates of chromium and iron

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Submitted
11 Nov 2020
Accepted
30 Nov 2020
First published
18 Dec 2020

Chem. Commun., 2021,57, 595-598
Article type
Communication

Low-spin 1,1′-diphosphametallocenates of chromium and iron

S. M. Greer, Ö. Üngor, R. J. Beattie, J. L. Kiplinger, B. L. Scott, B. W. Stein and C. A. P. Goodwin, Chem. Commun., 2021, 57, 595
DOI: 10.1039/D0CC06518H

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