Issue 17, 2016

Beyond organic chemistry: aromaticity in atomic clusters

Abstract

We describe joint experimental and theoretical studies carried out collaboratively in the authors' labs for understanding the structures and chemical bonding of novel atomic clusters, which exhibit aromaticity. The concept of aromaticity was first discovered to be useful in understanding the square-planar unit of Al4 in a series of MAl4 bimetallic clusters that led to discoveries of aromaticity in many metal cluster systems, including transition metals and similar cluster motifs in solid compounds. The concept of aromaticity has been found to be particularly powerful in understanding the stability and bonding in planar boron clusters, many of which have been shown to be analogous to polycyclic aromatic hydrocarbons in their π bonding. Stimulated by the multiple aromaticity in planar boron clusters, a design principle has been proposed for stable metal-cerntered aromatic molecular wheels of the general formula, M@Bnk. A series of such borometallic aromatic wheel complexes have been produced in supersonic cluster beams and characterized experimentally and theoretically, including Ta@B10 and Nb@B10, which exhibit the highest coordination number in two dimensions.

Graphical abstract: Beyond organic chemistry: aromaticity in atomic clusters

Article information

Article type
Perspective
Submitted
03 Dec 2015
Accepted
28 Jan 2016
First published
28 Jan 2016

Phys. Chem. Chem. Phys., 2016,18, 11589-11605

Beyond organic chemistry: aromaticity in atomic clusters

A. I. Boldyrev and L. Wang, Phys. Chem. Chem. Phys., 2016, 18, 11589 DOI: 10.1039/C5CP07465G

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