# Methane as a selectivity booster in the arc-discharge synthesis of endohedral fullerenes: selective synthesis of the single-molecule magnet Dy$_2$TiC@C$_{80}$ and its congener Dy$_2$TiC$_2$@C$_{80}$

Junghans, Katrin; Schlesier, Christin; Kostanyan, Aram; Samoylova, Nataliya A; Deng, Qingming; Rosenkranz, Marco; Schiemenz, Sandra; Westerström, Rasmus; Greber, Thomas; Büchner, Bernd; Popov, Alexey A (2015). Methane as a selectivity booster in the arc-discharge synthesis of endohedral fullerenes: selective synthesis of the single-molecule magnet Dy$_2$TiC@C$_{80}$ and its congener Dy$_2$TiC$_2$@C$_{80}$. Angewandte Chemie Internationale Edition, 54(45):13411-13415.

## Abstract

The use of methane as a reactive gas dramatically increases the selectivity of the arc-discharge synthesis of M-Ti-carbide clusterfullerenes (M=Y, Nd, Gd, Dy, Er, Lu). Optimization of the process parameters allows the synthesis of Dy$_2$TiC@C$_{80}$-I and its facile isolation in a single chromatographic step. A new type of cluster with an endohedral acetylide unit, M$_2$TiC$_2$@C$_{80}$, is discovered along with the second isomer of M$_2$TiC@C$_{80}$. Dy$_2$TiC@C$_{80}$-(I,II) and Dy$_2$TiC$_2$@C$_{80}$-I are shown to be single-molecule magnets (SMM), but the presence of the second carbon atom in the cluster Dy$_2$TiC$_2$@C$_{80}$ leads to substantially poorer SMM properties.

## Abstract

The use of methane as a reactive gas dramatically increases the selectivity of the arc-discharge synthesis of M-Ti-carbide clusterfullerenes (M=Y, Nd, Gd, Dy, Er, Lu). Optimization of the process parameters allows the synthesis of Dy$_2$TiC@C$_{80}$-I and its facile isolation in a single chromatographic step. A new type of cluster with an endohedral acetylide unit, M$_2$TiC$_2$@C$_{80}$, is discovered along with the second isomer of M$_2$TiC@C$_{80}$. Dy$_2$TiC@C$_{80}$-(I,II) and Dy$_2$TiC$_2$@C$_{80}$-I are shown to be single-molecule magnets (SMM), but the presence of the second carbon atom in the cluster Dy$_2$TiC$_2$@C$_{80}$ leads to substantially poorer SMM properties.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2015 10 Nov 2015 14:32 16 Dec 2016 11:37 Wiley-VCH Verlag 1433-7851 https://doi.org/10.1002/anie.201505870

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