Results
Title

A Stable Cyclic (R<sub>2</sub>SnAu)<sub>3</sub> Anion Having In‐Plane σ‐Möbius Aromaticity.

Authors

Wang, Liliang; Xu, Jian; Kira, Mitsuo; Yan, Liping; Xiao, Xu‐Qiong; Li, Zhifang

Abstract

A cyclic (R2SnAu)3 anion (3−, R2Sn=2,2,5,5‐tetrakis(trimethylsilyl)‐1‐stannacyclopentane‐1,1‐diyl) has been synthesized as a stable blue salt with K (THF)6 through the reaction of stable dialkylstannylene 1 with R′3PAuCl (R′=Et, Ph) followed by the reduction with KC8. Crystallographic and NMR analysis shows that the six‐membered (SnAu)3 ring of 3− is planar and highly symmetric with an equal distance of six Au−Sn bonds. A UV/Vis spectrum of 3− in hexane reveals an intense absorption maximum at 598 nm. While cyclic Au3− with four valence electrons is known as unstable anti‐aromatic anion, 3− with three divalent tin ligands is stable σ aromatic anion with an unprecedented Möbius orbital array as predicted by the perturbation MO and CCSD analysis of 3−.

Subjects

AROMATICITY; CONDUCTION electrons; ANIONS

Publication

Angewandte Chemie, 2020, Vol 132, Issue 5, p1996

ISSN

0044-8249

Publication type

Academic Journal

DOI

10.1002/ange.201910731