Polysulfonylamines. CLXXVIII. Onium Salts of Benzene‐1,2‐di(sulfonyl)amine (HZ): A Second Crystal Form of the Ammonium Salt NH4Z·H2O and Crystal Structure of the Bis(triphenylphosphoranylidene)ammonium Salt [Ph3PNPPh3]ZA dimorphic form of NH4Z·H2O, where Z− is N‐deprotonated ortho‐benzenedisulfonimide, has been obtained and structurally characterized (previously known form 1A: monoclinic, P21/c, Z′ = 1; new polymorph 1B: monoclinic, P21/n, Z′ = 1). Both structures are dominated by an abundance of classical hydrogen bonds N+–H/O–H···O=S/OH2, whereby the anionic N− function does not act as an acceptor. The major difference between the dimorphs arises from the topology of the hydrogen bond network, which is two‐dimensional in 1A, leading to a packing of discrete lamellar layers, but three‐dimensional in 1B. Moreover, the latter network is reinforced by a set of weak C–H··O/N hydrogen bonds, whereas the layered structure of 1A displays only one independent C–H···O bond, providing a link between adjacent layers. The compound [Ph3PNPPh3]Z (2, monoclinic, P21/c, Z′ = 1) is the first structurally authenticated example of an ionic Z− derivative in which the cation contains neither metal bonding sites nor strong hydrogen bond donors. This structure exhibits columns of anions, surrounded by four parallel columns of cations, giving a square array. The large cations are associated into a three‐dimensional framework via weak C–H···C(π) interactions and an offset face‐to‐face phenyl interaction, while the anions occupy tunnels in this framework and are extensively bonded to the surrounding cations by C–H···O/N− hydrogen bonds and C–H···C(π) interactions.

Cocrystallization of tetramethylurea (TMU) with one equivalent of either di(4-fluorobenzenesulfo- nyl)amine (FAH), di(4-chlorobenzenesulfonyl)amine (CAH), di(4-bromobenzenesulfonyl)amine (BAH). di(4-iodobenzenesulfonyl)amine (IAH), di(4-methylbenzenesulfonyl)aniine (MAH>, ordi(4- nitrobenzenesulfonyDamine (NAH), using dichloromethane/petroleum ether as the solvent, afforded the molecular complexes (FAH)2 · TMU (1. monoclinic. P21/c,Z' = 1. structure previously reported), CAHTMU, BAH-TMU and IAH-TMU (2-4, isomorphic series, triclinic, P1̅,Z' = 1), MAH · TMU (5, monoclinic. P21, Z' = 1). and the uranium salt TMUH+NA- (6, monoclinic. P21/c,Z' = 2). The structural results obtained by X-ray crystallography at low temperatures indicate that the varying p- substituents of the di(arenesulfonyl)amines exert a decisive influence on (i) the stoichiometry of the cocrystallization reaction (2:1 for 1 vs. 1:1 for 2-6), (ii) the degree of proton transfer between the strongly acidic (SO2)2NH moieties and the basic carbonyl function of TMU (molecular complexes assembled via N-H···O=C hydrogen bonds in 1 -5 vs. two independent ion pairs based upon charge- assisted C-O-H+ ···N- interactions in 6). and (Hi) the conformation of the disulfonylamineZ-amide units as defined by rotations about the S-N bonds (extended forms displaying anticlinal C-S ··· S'- C' torsions for the two molecules in 1 and the two anions in 6 vs. folded forms featuring synperi- planar C-S ···S'-C torsions for the molecules in 2-5). The packing modes of 1-4 underline the well-known correlation between the atomic number of halogen atoms and their propensity to form halogen bonds. Thus, the structure of 1 is devoid of short F···O contacts, whereas the isomorphic co- crystals 2-4 consist of lamellar layers in which the inner lamellae include the TMU molecules and the peripheral regions are built up from CAH, BAH or IAH molecules associated into catemers via C-Hal ··· O=S bonds. The lamellar layers of the non-isomorphic methyl congener 5. although topological^' similar to those of 2-4, are stacked according to a herringbone pattern that does not arise in the structures of 2-4. The most prominent packing feature of the uranium salt 6 are intimate dimers of two independent NA- ions, stabilized by dipolar nitro-nitro interactions and C-H ··· O=S contacts and further connected into monolayers through C-H ··· Onitro contacts. The uranium ions are inserted between these layers and bonded to the anion dimers by the strong hydrogen bonds mentioned above and numerous C-H ··· Onitro contacts. The presence of two independent formula units appears to arise from frustration between several competing interactions, e. g. dipolar nitro attractions, weak hydrogen bonding to sulfonyl and nitro acceptors and π/π stacking of aromatic rings.

Polysulfonylamines. CLXXXIV. Crystal Structures of Molecular Triphenylphosphanegold(I) Di(4‐X‐benzenesulfonyl)amides: Isomorphism and Close Packing (X = Me, F, Cl, NO2) vs. Structure‐Determining C–X···Au/O Halogen Bonds (X = Br, I)In order to study the structure‐determining influence that halogen bonding can exert during the course of crystallization, solid‐state structures are compared for two previously reported and four new molecular gold(I) complexes of the type Ph3P–Au–N(SO2–C6H4–4‐X)2, each featuring linear P,N coordination at gold and two phenyl rings with varying p‐substituents X = Me, F, Cl, NO2, Br or I. The compounds were synthesized by reactions of Ph3PAuX (X = Cl or I) with the corresponding silver di(arenesulfonyl)amides, crystallized from dichloromethane, and characterized by low‐temperature X‐ray diffraction. The Me, F, Cl and NO2 congeners are isomorphic and crystallize without solvent inclusion in the chiral orthorhombic space group P212121 (Z′ = 1). These structures are governed by isotropic close packing via three‐dimensional 21 symmetry, incidentally supported by an invariant set of C–H···O=S hydrogen bonds, CH/π interactions and π/π stackings of aromatic rings; in particular, the hard halogen atoms of the fluoro and the chloro homologues are not involved in X···Au, X···O or X···X interactions. The higher homologues, with soft halogen atoms, were obtained as a dichloromethane hemisolvate for X = Br and a corresponding monosolvate for X = I, each triclinic in the centrosymmetric space group $P{\bar 1}$ (Z′ = 1). Here, the primary structural effect is implemented by infinite chains in which translation‐related molecules are connected for the bromo compound by a bifurcated Au···Br(2)···O=S interaction, for the iodo congener by an equivalent Au···I(2)···O=S interaction and a short halogen bond C–I(1)···O=S. The latter bond is stronger than a similar C–Br···O=S interaction and induces a conformational adjustment of the (CSO2)2N group from the normal twofold symmetry in the bromo compound to an energetically unfavourable asymmetric form in the iodo homologue. In both cases, pairs of antiparallel molecular catemers are associated into strands via sixfold phenyl embraces, the strands are stacked to form layers, the solvent molecules are intercalated between adjacent layers, and the crystal packings are reinforced by a number of C–H···O=S hydrogen bonds and interactions of aromatic rings.