Issue 3, 2016

Effective magnetic coupling with strong spin frustration in (Ph3MeP+)(C60˙) and reversible C60˙ dimerization in (Ph3MeP+)(C60˙)·C6H5CN. Effect of solvent on structure and properties

Abstract

Solvent free and solvent containing salts of the C60˙ radical anions with the triphenylmethylphosphonium cations, (Ph3MeP+)(C60˙) (1) and (Ph3MeP+)(C60˙)·C6H5CN (2), have been obtained. The salts show different structures and physical properties. Complex 1 has double chains from C60˙ with triangular fullerene arrangement and short interfullerene center-to-center distances of 10.079(1)–10.103(1) Å. No dimerization is observed in 1 preserving unpaired spins down to 1.9 K and providing magnetic moment of 1.68 μB at 300 K. Weiss temperature of Θ = −60 K indicates a strong antiferromagnetic coupling of spins. In spite of that, no magnetic ordering is observed down to 1.9 K showing that 1 has strong frustration of spins (f = Θ/TN > 30) due to triangular fullerene lattice. Compound 2 additionally contains the C6H5CN solvent molecules and has a layered structure with fullerene hexagons accommodating the Ph3MeP+ cations and C6H5CN solvent molecules in the center. Interfullerene center-to-center distances vary in the fullerene layers in the 9.921(2)–10.066(2) Å range. Fullerenes dimerize reversibly in pairs with a shortest interfullerene center-to-center distance of 9.921(2) Å below 220 K to form diamagnetic singly-bonded (C60)2 dimers.

Graphical abstract: Effective magnetic coupling with strong spin frustration in (Ph3MeP+)(C60˙−) and reversible C60˙− dimerization in (Ph3MeP+)(C60˙−)·C6H5CN. Effect of solvent on structure and properties

Supplementary files

Article information

Article type
Paper
Submitted
18 Oct 2015
Accepted
18 Jan 2016
First published
19 Jan 2016
This article is Open Access
Creative Commons BY license

New J. Chem., 2016,40, 2792-2798

Effective magnetic coupling with strong spin frustration in (Ph3MeP+)(C60˙) and reversible C60˙ dimerization in (Ph3MeP+)(C60˙)·C6H5CN. Effect of solvent on structure and properties

D. V. Konarev, S. S. Khasanov, A. V. Kuzmin, A. Otsuka, H. Yamochi, G. Saito and R. N. Lyubovskaya, New J. Chem., 2016, 40, 2792 DOI: 10.1039/C5NJ02886H

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