Dimers and chains of {3d-4f} single molecule magnets constructed from heterobimetallic tectons

A tetranuclear complex and a 1-D coordination polymer with a ladder-like topology have been obtained by connecting [Ni(II)Dy(III)] nodes with dicarboxylato ligands: [Ni₂(valpn)₂Dy₂(III)(pdca)₂(NO₃)(H₂O)₆](NO₃)·4H₂O 1, and (∞)¹[Ni₂(H₂O)₂(valpn)₂Dy₂(tfa)₃]·4CH₃CN 2 (valpn²⁻ = the dianion of the Schiff...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2010-01, Vol.39 (20), p.4802-4808
Main Authors: Pasatoiu, Traian D, Etienne, Mael, Madalan, Augustin M, Andruh, Marius, Sessoli, Roberta
Format: Article
Language:English
Subjects:
Chemical Sciences
Coordination polymers
Dimers
Ferromagnetism
Inorganic chemistry
Joining
Ligands
Schiff bases
Terephthalic acid
Tunnelling
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Summary:A tetranuclear complex and a 1-D coordination polymer with a ladder-like topology have been obtained by connecting [Ni(II)Dy(III)] nodes with dicarboxylato ligands: [Ni₂(valpn)₂Dy₂(III)(pdca)₂(NO₃)(H₂O)₆](NO₃)·4H₂O 1, and (∞)¹[Ni₂(H₂O)₂(valpn)₂Dy₂(tfa)₃]·4CH₃CN 2 (valpn²⁻ = the dianion of the Schiff base resulting from reacting o-vanillin with 1,3-propanediamine; pdca²⁻ = the dianion of 2,6-pyridinedicarboxylic acid; tfa²⁻ = the dianion of the terephthalic acid). The magnetic measurements show a ferromagnetic interaction between Ni(II) and Dy(III), and that both compounds behave like SMM with strong tunnelling. The barrier of 2 (17.4 K) is higher than that of 1 (13.6 K).
ISSN:1477-9226
1477-9234
DOI:10.1039/b925425k