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A proposal for an extended dual descriptor: a possible solution when Frontier Molecular Orbital Theory fails.

Physical chemistry chemical physics : PCCP (2013-07-31)
Vincent Tognetti, Christophe Morell, Paul W Ayers, Laurent Joubert, Henry Chermette
ABSTRACT

In this paper, we introduce new local descriptors in the framework of Conceptual Density Functional Theory. They can be considered as an extension of the dual descriptor [Morell et al., J. Phys. Chem. A, 2005, 109, 205]. These indices are particularly suited for the discrimination between electrophilic and nucleophilic sites inside a molecule. They are computed using the densities of the electronic excited states, giving a picture of the polarization of the electron density induced by the approach of a reactant. Links with the linear-response function are discussed, and the first examples of applications are given, highlighting how these new descriptors can be used in practice for reactivity studies. It has been found that this extension of the dual descriptor can handle tricky cases, such as nitrobenzene or isoquinoline, for which Frontier Molecular Orbital Theory fails.

MATERIALS
Product Number
Brand
Product Description

Supelco
Nitrobenzene, PESTANAL®, analytical standard
Sigma-Aldrich
Phenanthrene, 98%
Supelco
Phenanthrene, analytical standard, for environmental analysis
Supelco
Nitrobenzene solution, certified reference material, 5000 μg/mL in methanol
Sigma-Aldrich
Phenanthrene, sublimed grade, ≥99.5%
Supelco
Phenanthrene, certified reference material, TraceCERT®
Sigma-Aldrich
Nitrobenzene, ACS reagent, ≥99.0%
Sigma-Aldrich
Nitrobenzene, ReagentPlus®, 99%
Sigma-Aldrich
Isoquinoline, 97%
Sigma-Aldrich
Isoquinoline, technical grade, 90-92%
Supelco
Phenanthrene solution, certified reference material, 5000 μg/mL in methanol