CoIILnIII dinuclear complexes (LnIII = Gd, Tb, Dy, Ho and Er) as platforms for 1,5-dicyanamide-bridged tetranuclear CoII2LnIII2 complexes: A magneto-structural and theoretical study

Enrique Colacio, Jose Ruiz, Antonio J. Mota, Maria A. Palacios, Eliseo Ruiz, Eduard Cremades, Mikko M. Hanninen, Reijo Sillanpaa, Euan K. Brechin

Research output: Contribution to journalArticlepeer-review

Abstract

Five acetate-diphenoxo triply-bridged Co-II-Ln(III) complexes (Ln(I) = Gd, Tb, Dy, Ho, Er) of formula [Co(mu-L)(mu-Ac)Ln(NO3)(2)] and two diphenoxo doubly-bridged Co-II-Ln(III) complexes (Ln(III) = Gd, Tb) of formula [Co(H2O)(mu-L)Ln(NO3)(3)]center dot S (S = H2O or MeOH), were prepared in one pot reaction from the compartmental ligand N,N',N ''-trimethyl-N,N ''-bis(2-hydroxy3-methoxy-5-methylbenzyl)diethylene triamine (H2L). The diphenoxo doubly-bridged Co-II-Ln(III) complexes were used as platforms to obtain 1,5-dicyanamide-bridged tetranuclear Co-II-Ln(III) complexes (Ln(III) = Gd, Tb, Dy, Ho, Er). All exhibit ferromagnetic interactions between the Co-II and Ln(III) ions and in the case of the Gd-III complexes, the J(CoGd) were estimated to be similar to+0.7 cm(-1). Compound 3 exhibits slow relaxation of the magnetization.

Original languageEnglish
Pages (from-to)878-888
Number of pages11
JournalComptes Rendus Chimie
Volume15
Issue number10
DOIs
Publication statusPublished - Oct 2012

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