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Campbell R, Carrella LM, Clegg W, et al. Sodium congener of the classical lithium methylchromate dimer: synthetic, X-ray crystallographic, and magnetic studies of Me8Cr2[Na(OEt2)]4. Inorg Chem. 2011;50(10):4656-9doi: 10.1021/ic200471b.
Campbell, R., Carrella, L. M., Clegg, W., Mulvey, R. E., Rentschler, E., Robertson, S. D., & Russo, L. (2011). Sodium congener of the classical lithium methylchromate dimer: synthetic, X-ray crystallographic, and magnetic studies of Me8Cr2[Na(OEt2)]4. Inorganic chemistry, 50(10), 4656-9. https://doi.org/10.1021/ic200471b
Campbell, Ross, et al. "Sodium congener of the classical lithium methylchromate dimer: synthetic, X-ray crystallographic, and magnetic studies of Me8Cr2[Na(OEt2)]4." Inorganic chemistry vol. 50,10 (2011): 4656-9. doi: https://doi.org/10.1021/ic200471b
Campbell R, Carrella LM, Clegg W, Mulvey RE, Rentschler E, Robertson SD, Russo L. Sodium congener of the classical lithium methylchromate dimer: synthetic, X-ray crystallographic, and magnetic studies of Me8Cr2[Na(OEt2)]4. Inorg Chem. 2011 May 16;50(10):4656-9. doi: 10.1021/ic200471b. Epub 2011 Apr 12. PMID: 21486011.
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Inorg Chem. 2011 May 16;50(10):4656-9. doi: 10.1021/ic200471b. Epub 2011 Apr 12.

Sodium congener of the classical lithium methylchromate dimer: synthetic, X-ray crystallographic, and magnetic studies of Me8Cr2[Na(OEt2)]4.

Inorganic chemistry

Ross Campbell, Luca M Carrella, William Clegg, Robert E Mulvey, Eva Rentschler, Stuart D Robertson, Luca Russo

Affiliations

  1. WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, UK.

PMID: 21486011 DOI: 10.1021/ic200471b

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 Me(8)Cr(2)[Li(donor)](4) (donor = THF or Et(2)O). Using a simple salt metathesis reaction mixing this compound with sodium tert-butoxide, the sodium congener Me(8)Cr(2)[Na(OEt(2))](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 (Me(8)Cr(4))(4-) tetranionic core with four peripheral Na(+) cations carrying supporting ether ligands. Its salient feature is the long Cr···Cr distance of 3.263(2) Å, which is remarkably elongated compared to that in the lithium THF-solvated congener [1.968(2) Å]. 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···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.

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