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Issue 5, 2015
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Cr(I)Cl as well as Cr+ are stabilised between two cyclic alkyl amino carbenes

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Abstract

Cr(I)Cl is a very unstable species. The present work describes the stabilisation of Cr(I)Cl in the low coordinate environment of cyclic alkyl(amino) carbene ligands and its synthetic application to yield an unprecedented cationic complex with a two coordinate Cr(I). One electron reduction of (cAAC)2CrCl2 (1) with equivalent amount of KC8 results in the formation of (cAAC)2CrCl (2), with a distorted trigonal planar configuration at the metal centre. SQUID, EPR and theoretical studies reveal a Cr(I) centre with S = 5/2 spin ground state for 2. It represents the first example of a mononuclear Cr complex showing slow relaxation of magnetisation under an applied magnetic field. The chlorine atom in 2 is expected to be prone to further reactions with appropriate reagents. This qualifies 2 as a promising precursor for the preparation of various interesting complexes with Cr(I) in a low coordinate environment. The first example of this metathesis reaction is observed when 2 is treated with Na[B(C6H3(CF3)2)4] resulting in [(cAAC)2Cr]+[B(C6H3(CF3)2)4], a linear cationic complex with two coordinate Cr(I) and an S = 5/2 spin ground state.

Graphical abstract: Cr(i)Cl as well as Cr+ are stabilised between two cyclic alkyl amino carbenes

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Publication details

The article was received on 20 Feb 2015, accepted on 20 Mar 2015 and first published on 20 Mar 2015


Article type: Edge Article
DOI: 10.1039/C5SC00646E
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Chem. Sci., 2015,6, 3148-3153
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    Cr(I)Cl as well as Cr+ are stabilised between two cyclic alkyl amino carbenes

    P. P. Samuel, R. Neufeld, K. Chandra Mondal, H. W. Roesky, R. Herbst-Irmer, D. Stalke, S. Demeshko, F. Meyer, V. C. Rojisha, S. De, P. Parameswaran, A. C. Stückl, W. Kaim, J. H. Christian, J. K. Bindra and N. S. Dalal, Chem. Sci., 2015, 6, 3148
    DOI: 10.1039/C5SC00646E

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