Issue 8, 2007
From the journal:

Dalton Transactions

Lanthanide–3d cyanometalate chains Ln(iii)–M(iii) (Ln = Pr, Nd, Sm, Eu, Gd, Tb; M = Fe) with the tridentate ligand2,4,6-tri(2-pyridyl)-1,3,5-triazine (tptz): evidence of ferromagnetic interactions for the Sm(iii)–M(iii) compounds (M = Fe, Cr)†‡

Hanhua Zhao,a   Nazario Lopez,a   Andrey Prosvirin,a   Helen T. Chifotidesa  and  Kim R. Dunbar*a  

* Corresponding authors

a Department of Chemistry, Texas A & M University, P. O. Box 30012, College Station, TX, USA
E-mail: dunbar@mail.chem.tamu.edu
Fax: +1 (979) 845-7177
Tel: +1 (979) 845-5235

Abstract

A series of cyanide-bridged chain mixed Fe(III)/Ln(III) (Ln = Pr, Nd, Sm, Eu, Gd, Tb) complexes with the tridentate ligand 2,4,6-tri(2-pyridyl)-1,3,5-triazine (tptz) used as a capping group has been prepared. Reactions of tptz and LnCl3 with K3Fe(CN)6 yield a family of air-stable 1-D compounds {[Pr(tptz)(H2O)4Fe(CN)6]·8H2O}∞ (1), {[Nd(tptz)(H2O)4Fe(CN)6]·8H2O}∞ (2), {[Sm(tptz)(H2O)4Fe(CN)6]·8H2O}∞ (3), {[Eu(tptz)(H2O)4Fe(CN)6]·6H2O}∞ (4), {[Gd(tptz)(H2O)4Fe(CN)6]·6H2O}∞ (5), and {[Tb(tptz)(H2O)4Fe(CN)6]·8H2O}∞ (6). Temperature dependent magnetic susceptibility studies of 1–6 reveal that in 3, the Sm(III) and Fe(III) ions are ferromagnetically coupled with 3-D ordering occurring below 3.5 K. The appearance of the frequency dependent out-of-phase signal is explained in terms of an ordering with a spin glass-like behavior. To compare the magnetic behavior of 3 with related compounds, {[Sm(tptz)(H2O)4Co(CN)6]·8H2O}∞ (7) and {[La(tptz)(DMF)(H2O)3Fe(CN)6]·5H2O}∞ (8), {[Sm(tmphen)(DMF)3(H2O)Fe(CN)6]·2H2O}∞ (9), {[Sm(tmphen)2(H2O)2Fe(CN)6]·MeOH·13H2O}∞ (10) and {[Sm(tmphen)2(H2O)2Cr(CN)6]·MeOH·9H2O}∞ (11) with 3,4,7,8-tetramethyl-1,10-phenanthroline (tmphen) were also prepared.

Graphical abstract: Lanthanide–3d cyanometalate chains Ln(iii)–M(iii) (Ln = Pr, Nd, Sm, Eu, Gd, Tb; M = Fe) with the tridentate ligand 2,4,6-tri(2-pyridyl)-1,3,5-triazine (tptz): evidence of ferromagnetic interactions for the Sm(iii)–M(iii) compounds (M = Fe, Cr)

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Article information

DOI
https://doi.org/10.1039/B616016F
Article type
Paper
Submitted
03 Nov 2006
Accepted
19 Dec 2006
First published
18 Jan 2007

Dalton Trans., 2007, 878-888

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Lanthanide–3d cyanometalate chains Ln(III)–M(III) (Ln = Pr, Nd, Sm, Eu, Gd, Tb; M = Fe) with the tridentate ligand 2,4,6-tri(2-pyridyl)-1,3,5-triazine (tptz): evidence of ferromagnetic interactions for the Sm(III)–M(III) compounds (M = Fe, Cr)

H. Zhao, N. Lopez, A. Prosvirin, H. T. Chifotides and K. R. Dunbar, Dalton Trans., 2007, 878 DOI: 10.1039/B616016F

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