Conclusions
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1.
The MO LCAO method in the MNDO approximation has been used to investigate energetic, structural and electronic effects in the formation of the donor-acceptor P ← N bond in the complexes XPF3· NH3, modeling the phosphatranes.
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2.
The effect of substituents on the phosphorus atom on the formation of the P ← N bond is attributed mainly to changes in the acceptor properties of the lowest unoccupied MO localized on the P atom.
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3.
Depending on the structure of the molecule, the replacement of an F atom by a Cl atom in complexes of the type XSiR3 1· NR3 2 can either weaken or strengthen the donor-acceptor Si ← N bond.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2061–2066, September, 1988.
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Korkin, A.A., Aksinenko, N.A. & Tsvetkov, E.N. Semiempirical models of the transannular bond in silatranes and phosphatranes. Russ Chem Bull 37, 1846–1851 (1988). https://doi.org/10.1007/BF00962501
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DOI: https://doi.org/10.1007/BF00962501