Volume 61, Issue 2 e202113275
Communication

A Face-to-Face Dimer of Au3 Superatoms Supported by Interlocked Tridentate Scaffolds Formed in Au18S2(SR)12

Taro Shigeta

Taro Shigeta

Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 1130033 Japan

Search for more papers by this author
Dr. Shinjiro Takano

Dr. Shinjiro Takano

Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 1130033 Japan

Search for more papers by this author
Prof. Dr. Tatsuya Tsukuda

Corresponding Author

Prof. Dr. Tatsuya Tsukuda

Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 1130033 Japan

Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, 1-30 Goryo-Ohara, Nishikyo-ku, Kyoto, 6158245 Japan

Search for more papers by this author
First published: 09 November 2021
Citations: 11

Graphical Abstract

Au18S2(SR)12, a new gold cluster that can be viewed as an interlocked dimer of Au9S(SR)6 cages, was synthesized using a bulky thiol ligand. Theoretical calculation demonstrated that the Au6 core can be interpreted as a face-to-face dimer of Au3 superatoms.

Abstract

A new sulfur-containing gold cluster, Au18S2(STipb)12, was serendipitously obtained using the bulky thiol, 2,4,6-triisopropylbenzyl mercaptan (TipbSH), as protecting ligands. Single-crystal X-ray diffraction analysis revealed that Au18S2(STipb)12 has a deformed octahedral Au6 core clutched by two tridentate S[Au2(STipb)2]3 units in an interlocked manner. Based on density functional theory calculations, we propose that the Au6 core with two electrons is better viewed as a face-to-face dimer of Au3(1e) superatoms rather than an electronically closed Au6(2e) superatom. In situ formation of the sulfide anions (S2−) via C-S bond breakage is ascribed to the steric repulsion between the TipbS ligands.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.