TY - JOUR
T1 - CoIILnIII dinuclear complexes (LnIII = Gd, Tb, Dy, Ho and Er) as platforms for 1,5-dicyanamide-bridged tetranuclear CoII2LnIII2 complexes
T2 - A magneto-structural and theoretical study
AU - Colacio, Enrique
AU - Ruiz, Jose
AU - Mota, Antonio J.
AU - Palacios, Maria A.
AU - Ruiz, Eliseo
AU - Cremades, Eduard
AU - Hanninen, Mikko M.
AU - Sillanpaa, Reijo
AU - Brechin, Euan K.
PY - 2012/10
Y1 - 2012/10
N2 - 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.
AB - 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.
U2 - 10.1016/j.crci.2012.08.001
DO - 10.1016/j.crci.2012.08.001
M3 - Article
SN - 1631-0748
VL - 15
SP - 878
EP - 888
JO - Comptes Rendus Chimie
JF - Comptes Rendus Chimie
IS - 10
ER -