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Issue 40, 2020
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Macrocycle supported dimetallic lanthanide complexes with slow magnetic relaxation in Dy2 analogues

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Abstract

Six dimetallic lanthanide complexes, [Ln2(L′)(acac)4] (1Dy–3Gd) (Ln = Dy (1Dy), Tb (2Tb) and Gd (3Gd)) and [Ln2(L′)(tfac)4] (4Dy–6Gd) (Ln = Dy (4Dy), Tb (5Tb) and Gd (6Gd)) (H2L′ = 1,9-dichloro-3,7,11,15-tetraaza-1,9(1,3)-dibenzenacyclohexadecaphane-2,10-diene-1,9-diol), have been synthesized by the reaction of lanthanide nitrates with the HL ligand in the presence of acetylacetonate (acac) (or trifluoroacetylacetonate (tfac) and triethylamine (HL = 4-chloro-2,6-bis(-((3-((3-(dimethylamino)propyl)amino)propyl)imino)methyl)phenol). Ln-Assisted modification of the Schiff base HL occurred and led to the formation of a new macrocyclic ligand (H2L′). X-ray crystallographic analysis revealed that the LnIII ions of complexes 1Dy–6Gd are all eight-coordinated in a square antiprismatic geometry with D4d local symmetry. Magnetic measurements of these complexes revealed that 1Dy and 4Dy show single-molecule magnet behaviour with energy barriers of 66.7 and 79.0 K, respectively, under a zero direct magnetic field. The orientations of the magnetic axes and crystal field parameters were obtained from theoretical calculations and an electrostatic model. The magneto-structural correlations of SMMs 1Dy and 4Dy are further discussed in detail.

Graphical abstract: Macrocycle supported dimetallic lanthanide complexes with slow magnetic relaxation in Dy2 analogues

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Supplementary files

Article information


Submitted
09 Aug 2020
Accepted
17 Sep 2020
First published
18 Sep 2020

Dalton Trans., 2020,49, 14169-14179
Article type
Paper

Macrocycle supported dimetallic lanthanide complexes with slow magnetic relaxation in Dy2 analogues

F. Shen, K. Pramanik, P. Brandão, Y. Zhang, N. Ch. Jana, X. Wang and A. Panja, Dalton Trans., 2020, 49, 14169
DOI: 10.1039/D0DT02778B

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