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The P=S bond lengths, and the N...S distances in N—H...S=P hydrogen bonds are studied considering two new thio­phospho­ramide structures with P(S)[N]3 and P(S)[O]2[N] skeletons and their analogous compounds deposited in the Cambridge Structural Database.

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Similar Hirshfeld surface shapes of the 1,1′-(ethane-1,2-diyl)dipyridinium dication are observed in its perchlorate and peroxo­di­sulfate salts. The asymmetric two-dimensional fingerprint plots and the preponderance of H...O inter­actions in the crystal structures are discussed.

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The crystal structures of three new phospho­ric tri­amides with a [C(O)NH]P(O)[N(C)(C)]2 skeleton are discussed. The C-N-C and P-N-C bond angles in these structures and analogous structures deposited in the Cambridge Structural Database are analysed.
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