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Issue 15, 2003
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Isomerization by ligand shuffling along a Cr24+ unit: further reactions leading to cleavage of a quadruple bond

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Abstract

The paddlewheel complex Cr2(DpyF)4 (1), where DpyF = N,N′-di(2-pyridyl)formamidinate, has a short Cr–Cr distance of 1.938(2) Å for the Cr[quadruple bond, length as m-dash]Cr quadruple bond. In solution, there is a series of interconverting isomers, as determined by variable temperature 1H NMR studies. Compound 1 can be readily oxidized by CuCl2 to produce [Cr2(DpyF)4][CuCl2]2 (2) and [Cr2(DpyF)4CuCl3][CuCl2] (3). In both cases, the metal–metal quadruple bond is cleaved in favor of six-coordinate Cr(III) ions. Magnetic measurements for the oxidized products show that the chromium ions in the dichromium units exhibit strong antiferromagnetic interactions.

Graphical abstract: Isomerization by ligand shuffling along a Cr24+ unit: further reactions leading to cleavage of a quadruple bond

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Article information


Submitted
12 May 2003
Accepted
18 Jun 2003
First published
03 Jul 2003

Dalton Trans., 2003, 3022-3027
Article type
Paper

Isomerization by ligand shuffling along a Cr24+ unit: further reactions leading to cleavage of a quadruple bond

R. Clérac, F. Albert Cotton, S. P. Jeffery, C. A. Murillo and X. Wang, Dalton Trans., 2003, 3022
DOI: 10.1039/B305304K

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