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Issue 15, 2019
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Bond stretch isomerism in Be32− driven by the Renner–Teller effect

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Abstract

We investigate the underlying principle behind the occurrence of bond stretch isomerism in Be32−, which has not been revealed yet. Various computational studies of the different isomers are carried out at the complete active space self-consistent field (CASSCF) level of theory in addition to the B3LYP level in conjunction with the 6-311++G(d) basis set. The potential energy surfaces linking the different isomers through transition states and conical intersections are investigated at the CASSCF level, connecting various geometrical isomers of Be32−. The linear intermediate of the Be32− cluster is considered to be of profound importance since its excited state is found to be degenerate and undergoing the Renner–Teller effect, producing two triangular bond stretch isomers. Ab initio molecular dynamics simulations based on the Atom Centered Density Matrix Propagation (ADMP) method also further elucidate the phenomenon of isomerization via the linear intermediate. The variation of the global reactivity descriptors and free energy profile along the bond stretch isomerization path is also investigated. The estimated aromatic stabilization energy also corroborates the stability ordering of the bond stretch isomers.

Graphical abstract: Bond stretch isomerism in Be32− driven by the Renner–Teller effect

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Article information


Submitted
01 Feb 2019
Accepted
22 Mar 2019
First published
23 Mar 2019

Phys. Chem. Chem. Phys., 2019,21, 7996-8003
Article type
Paper

Bond stretch isomerism in Be32− driven by the Renner–Teller effect

M. Homray, S. Mondal, A. Misra and P. K. Chattaraj, Phys. Chem. Chem. Phys., 2019, 21, 7996
DOI: 10.1039/C9CP00643E

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