Issue 4, 2019

Fullerene and endometallofullerene Kagome lattices with symmetry-forced spin frustration

Abstract

Salts of fullerene C60˙ and endometallofullerene Sc3N@Ih-C80˙ radical anions with Bu3MeP+ cations ((Bu3MeP+)3(C60˙)3·C6H4Cl2 (1) and (Bu3MeP+)3(Sc3N@Ih-C80˙)3·C6H4Cl2 (2)) have been obtained. The C3 symmetry of the Bu3MeP+ cation provides 2D Kagome lattices with an equilateral triangle arrangement of fullerenes in accordance with trigonal crystal symmetry P31m. The C60˙ and Sc3N@Ih-C80˙ radical anions preserve their monomeric forms in 1 and 2 with the S = 1/2 spin state down to 1.9 K. The close packing of the fullerene radical anions results in strong antiferromagnetic coupling of the spins with Weiss temperatures of −108 K for 1 and −43 K for 2. Compound 1 is a rare example of a magnetic system in which in spite of the strong magnetic coupling of spins no long-range ordering is observed down to 1.9 K. The 13C NMR spectra of the 13C enriched sample of 1 support the absence of the antiferromagnetic ordering of spins down to 1.5 K. Thus, the crystals of 1 preserve large spin frustration forced by the trigonal symmetry. Therefore, compound 1 is a promising candidate for the first observation of a quantum spin liquid (QSL) state in a fullerene-based system. Isostructural salt 2 is the first compound that contains monomeric paramagnetic Sc3N@Ih-C80˙ radical anions stable down to 1.9 K, which show strong spin frustration. These data indicate the ability of endometallofullerenes to give exotic magnetic systems such as QSLs.

Graphical abstract: Fullerene and endometallofullerene Kagome lattices with symmetry-forced spin frustration

Supplementary files

Article information

Article type
Communication
Submitted
13 Xim 2018
Accepted
17 Kax 2018
First published
17 Kax 2018

Phys. Chem. Chem. Phys., 2019,21, 1645-1649

Fullerene and endometallofullerene Kagome lattices with symmetry-forced spin frustration

D. V. Konarev, S. S. Khasanov, Y. Shimizu, A. V. Kuzmin, A. Otsuka, H. Yamochi, G. Saito and R. N. Lyubovskaya, Phys. Chem. Chem. Phys., 2019, 21, 1645 DOI: 10.1039/C8CP07017B

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