Chemical Bonding by the Chemical Orthogonal Space of Reactivity |
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Authors: | Mihai V Putz |
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Affiliation: | 1.Laboratory of Structural and Computational Physical-Chemistry for Nanosciences and QSAR, Biology-Chemistry Department, Faculty of Chemistry, Biology, Geography, West University of Timisoara, Pestalozzi Street No. 16, RO-300115 Timisoara, Romania; or ;2.Laboratory of Renewable Energies 1—Scientific Research, R&D National Institute for Electrochemistry and Condensed Matter, Street Dr. Aurel Paunescu Podeanu No. 144, RO-300569 Timisoara, Romania |
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Abstract: | The fashionable Parr–Pearson (PP) atoms-in-molecule/bonding (AIM/AIB) approach for determining the exchanged charge necessary for acquiring an equalized electronegativity within a chemical bond is refined and generalized here by introducing the concepts of chemical power within the chemical orthogonal space (COS) in terms of electronegativity and chemical hardness. Electronegativity and chemical hardness are conceptually orthogonal, since there are opposite tendencies in bonding, i.e., reactivity vs. stability or the HOMO-LUMO middy level vs. the HOMO-LUMO interval (gap). Thus, atoms-in-molecule/bond electronegativity and chemical hardness are provided for in orthogonal space (COS), along with a generalized analytical expression of the exchanged electrons in bonding. Moreover, the present formalism surpasses the earlier Parr–Pearson limitation to the context of hetero-bonding molecules so as to also include the important case of covalent homo-bonding. The connections of the present COS analysis with PP formalism is analytically revealed, while a numerical illustration regarding the patterning and fragmentation of chemical benchmarking bondings is also presented and fundamental open questions are critically discussed. |
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Keywords: | electronegativity chemical hardness chemical orthogonal space of reactivity chemical power index charge transfer chemical orthogonal space Parr– Pearson bonding model |
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