Dalton Transactions (Print Edition) 2015-10-14

The first example of erbium triple-stranded helicates displaying SMM behaviour.

Adam Gorczyński, Maciej Kubicki, Dawid Pinkowicz, Robert Pełka, Violetta Patroniak, Robert Podgajny

Index: Dalton Trans. 44(38) , 16833-9, (2015)

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Abstract

A series of isostructural C3-symmetrical triple stranded dinuclear lanthanide [Ln2L3](NO3)3 molecules have been synthesized using subcomponent self-assembly of Ln(NO3)3 with 2-(methylhydrazino)benzimidazole and 4-tert-butyl-2,6-diformylphenol, where Ln = Tb (1), Dy (2), Ho (3), Er (4), Tm (5), and Yb (6). The temperature dependent and field dependent magnetic properties of 1-6 were modeled using the van Vleck approximation including the crystal field term HCF, the super-exchange term HSE and the Zeeman term HZE. Ferromagnetic interactions were found in 1, 2, 4 and 6, while antiferromagnetic interactions were found in 3 and 5. The erbium analogue reveals field induced SMM behaviour.