Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 116, Issue 26, Pages 7147-7153Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp301812j
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Funding
- National Science Foundation [1137751]
- Division Of Human Resource Development
- Direct For Education and Human Resources [1137751] Funding Source: National Science Foundation
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Under investigation is the structure and process that gives rise to hard-soft behavior in simple anionic atomic bases. That for simple atomic bases the chemical hardness is expected to be the only extrinsic component of acid-base strength, has been substantiated in the current study. A thermochemically based operational scale of chemical hardness was used to identify the structure within anionic atomic bases that is responsible for chemical hardness. The base's responding electrons have been identified as the structure, and the relaxation that occurs during charge transfer has been identified as the process giving rise to hard-soft behavior. This is in contrast the commonly accepted explanations that attribute hard-soft behavior to varying degrees of electrostatic and covalent contributions to the acid-base interaction. The ability of the atomic ion's responding electrons to cause hard-soft behavior has been assessed by examining the correlation of the estimated relaxation energies of the responding electrons with the operational chemical hardness. It has been demonstrated that the responding electrons are able to give rise to hard-soft behavior in simple anionic bases.
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