Issue 10, 2011

Copper(ii)-terbium(iii) Single-Molecule Magnets linked by photochromic ligands

Abstract

Two assemblies composed of single-molecule magnets (SMMs) linked by photochromic ligands, [CuII2TbIII2(L)2(NO3)2(dae-o)2]·2(n-BuOH) (1) and {[CuIITbIII(L)(n-BuOH)0.5]2(dae-c)3}·5(DMF)·4(n-BuOH)·2(H2O) (2), were synthesized by reacting the SMM [CuIITbIII(L)(NO3)3] (H2L = 1,3-bis((3-methoxysalicylidene)amino)propane) and photochromic molecules, H2dae-o and H2dae-c, which are open- and closed-ring isomers of 1,2-bis(5-carboxyl-2-methyl-3-thienyl)perfluoropentene (H2dae), respectively. 1 has a tetranuclear ring-like structure comprised of two [CuTb] units and two dae-o2− ligands. On the other hand, 2 has a one-dimensional ladder-type structure involving the [CuTb] and dae-c2 units in a 3 : 2 ratio. Magnetic studies revealed that 1 and 2 had ferromagnetic interactions between the CuII and TbIII ions and that both compounds exhibited frequency dependence of ac susceptibilities owing to freezing the magnetization of the [CuTb] SMM. Upon irradiation with ultraviolet light and visible light, an absorption band at ∼600 nm changed, indicating that photochromic reactions involving the dae2− ligands occurred. After irradiation, the magnetic behaviour of 1 did not change, whereas magnetic behaviour of 2 changed, due to the modification of intermolecular environment.

Graphical abstract: Copper(ii)-terbium(iii) Single-Molecule Magnets linked by photochromic ligands

Supplementary files

Article information

Article type
Paper
Submitted
27 Aug 2010
Accepted
13 Dec 2010
First published
17 Jan 2011

Dalton Trans., 2011,40, 2275-2282

Copper(II)-terbium(III) Single-Molecule Magnets linked by photochromic ligands

T. Shiga, H. Miyasaka, M. Yamashita, M. Morimoto and M. Irie, Dalton Trans., 2011, 40, 2275 DOI: 10.1039/C0DT01119C

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