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

Samuel M. Greer, Ökten Üngor, Ross J. Beattie, Jaqueline L. Kiplinger, Brian L. Scott, Benjamin W. Stein, Conrad A.P. Goodwin

Research output: Contribution to journalArticlepeer-review


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 = 3/2) 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.

Original languageEnglish
Pages (from-to)595-598
Number of pages4
JournalChemical Communications
Issue number5
Early online date18 Dec 2020
Publication statusPublished - 16 Jan 2021


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