Issue 24, 2018

A simple methodology for constructing ferromagnetically coupled Cr(iii) compounds


A large family of chromium(III) dimers has been synthesised and magneto-structurally characterised using a combination of carboxylate and diethanolamine type ligands. The compounds have the general formula [Cr2(R1-deaH)2(O2CR2)Cl2]Cl where R1 = Me and R2 = H (1), Me (2), CMe3 (3), Ph (4), 3,5-(Cl)2Ph (5), (Me)5Ph (6), R1 = Et and R2 = H (7), Ph (8). The compound [Cr2(Me-deaH)2Cl4] (9) was synthesised in order to study the effect of removing/adding the carboxylate bridge on the observed magnetic behaviour. Direct current (DC) magnetic susceptibility measurements showed ferromagnetic (FM) exchange interactions between the Cr(III) centres in the carboxylate bridged family with coupling constants in the range +0.37 < J < +8.02 cm−1. Removal of the carboxylate to produce the dialkoxide-bridged compound 9 resulted in antiferromagnetic (AFM) exchange between the Cr(III) ions. DFT calculations reveal the ferromagnetic exchange is the result of an orbital counter-complementarity effect occuring upon introduction of the bridging carboxylate.

Graphical abstract: A simple methodology for constructing ferromagnetically coupled Cr(iii) compounds

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Article information

Article type
15 May 2018
29 May 2018
First published
30 May 2018
This article is Open Access
Creative Commons BY license

Dalton Trans., 2018,47, 8100-8109

A simple methodology for constructing ferromagnetically coupled Cr(III) compounds

H. W. L. Fraser, L. Smythe, S. Dey, G. S. Nichol, S. Piligkos, G. Rajaraman and E. K. Brechin, Dalton Trans., 2018, 47, 8100 DOI: 10.1039/C8DT01963K

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