Abstract
A computational study at CCSD(T) theoretical level has been carried out on radical cation [(PH2X)2]·+ homodimers. Four stable minima configurations have been found for seven substituted phosphine derivatives, X = H, CH3, CCH, NC, OH, F and Cl. The most stable minimum presents an intermolecular two-center three-electron P···P bond except for X = CCH. The other three minima correspond to an alternative P···P pnicogen bonded complex, to a P···X contact and the last one to the complex resulting from a proton transfer, PH3X+:PHX·. The complexes obtained have been compared with those of the corresponding neutral ones, (PH2X)2, and the analogous protonated ones, PH3X+:PH2X, recently described in the literature. The spin and charge densities of the complexes have been examined. The electronic characteristics of the complexes have been analyzed with the NBO and AIM methods. The results obtained for the spin density, charge and NBO are coherent for all the complexes.
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Acknowledgments
This work has been supported by the Spanish Ministerio de Economía y Competitividad (CTQ2012-35513-C02-02) and Comunidad Autónoma de Madrid (S2013/MIT-2841, Fotocarbon). Computer, storage and other resources from the CTI (CSIC) are gratefully acknowledged. One of us (M.M.-L.) thanks the Ministerio de Economía y Competitividad for her contract.
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Marta Marín-Luna is on leave from Departamento de Química Orgánica, Facultad de Química, Universidad de Murcia, Campus de Espinardo, 30100 Murcia, Spain.
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Molecular graphs, CCSD(T)/CBS energy and geometry of the minima of the system calculated. Bond lengths and angles values of both monomers, A and B, in the complexes. Net charge values of monomers A in the complexes.(DOC 2130 kb)
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Marín-Luna, M., Alkorta, I. & Elguero, J. A computational study on [(PH2X)2]·+ homodimers involving intermolecular two-center three-electron bonds. Struct Chem 27, 753–762 (2016). https://doi.org/10.1007/s11224-015-0617-5
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DOI: https://doi.org/10.1007/s11224-015-0617-5