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Sodium Congener of the Classical Lithium Methylchromate Dimer: Synthetic, X-ray Crystallographic, and Magnetic Studies of Me8Cr2[Na(OEt2)](4)

Lookup NU author(s): Emeritus Professor Bill Clegg, Dr Luca Russo

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Abstract

One of the milestone structures in the development of transition-metal complexes with metal metal bonds of multiple bond order was the lithium methylchromate dimer Me8Cr2[Li(donor)](4) (donor = THF or Et2O). Using a simple salt metathesis reaction mixing this compound with sodium tert-butoxide, the sodium congener Me8Cr2-[Na(OEt2)]4 has been synthesized as a green crystalline compound and isolated in 51% yield. Its solid-state structure was determined by single-crystal X-ray diffraction. Exhibiting exact crystallographic C-4h symmetry, this heavier alkali-metal chromate structure is also dimeric, formally comprising a (Me8Cr4)(4-) tetranionic core with four peripheral Na+ cations carrying supporting ether ligands. Its salient feature is the long Cr center dot center dot center dot Cr distance of 3.263(2) angstrom, which is remarkably elongated compared to that in the lithium THF-solvated congener [1.968(2) angstrom]. With respect to the methyl C atoms, the Cr coordination is distorted-square-planar. Each Na interacts with four methyl C atoms, and there are also some short Na center dot center dot center dot H(C) contacts. Unlike for lithium chromate, no NMR spectroscopic data could be obtained for sodium chromate. The paramagnetic character of sodium chromate was confirmed by variable-temperature magnetization measurements, which indicated antiferromagnetic behavior.


Publication metadata

Author(s): Campbell R, Carrella LM, Clegg W, Mulvey RE, Rentschler E, Robertson SD, Russo L

Publication type: Article

Publication status: Published

Journal: Inorganic Chemistry

Year: 2011

Volume: 50

Issue: 10

Pages: 4656-4659

Print publication date: 12/04/2011

ISSN (print): 0020-1669

ISSN (electronic): 1520-510X

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/ic200471b

DOI: 10.1021/ic200471b


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