Title

"Vibrational Bonding": A New Type of Chemical Bond is Discovered

Document Type

Article

Publication Date

2015

Published In / Presented At

Science Progress (Vol.98, Iss.1)

Disciplines

Inorganic Chemistry | Physical Chemistry

Abstract

A long-sought but elusive new type of chemical bond, occurring on a minimum-free, purely repulsive potential energy surface, has recently been convincingly shown to be possible on the basis of high-level quantum-chemical calculations. This type of bond, termed a vibrational bond, forms because the total energy, including the dynamical energy of the nuclei, is lower than the total energy of the dissociated products, including their vibrational zero-point energy. For this to be the case, the ZPE of the product molecule must be very high, which is ensured by replacing a conventional hydrogen atom with its light isotope muonium (Mu, mass = 1/9 u) in the system Br-H-Br, a natural transition state in the reaction between Br and HBr. A paramagnetic species observed in the reaction Mu + Br-2 has been proposed as a first experimental sighting of this species, but definitive identification remains challenging.

DOI

10.3184/003685015X14232279560803