In the cyclic cations in [{NPMe2}4H+]2CoCl42–(I) and in the compound (NPMe2)4H·CuCl3(II) the bonds to the protonated nitrogen atom (N+) are long; the subsequent alternation of the P–N bond lengths, which is independent of the conformation of the ring, is interpreted in terms of the approximate equality of the components of a dual π-system.
J. Trotter, S. H. Whitlow and N. L. Paddock, J. Chem. Soc. D, 1969, 695 DOI: 10.1039/C29690000695
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