(4-Nitrophenylsulfanylmethyl)triphenylstannane and (4-nitrophenylsulfonylmethyl)triphenylstannane: R22(X) rings (X is 10, 18 or 24) and C-H...p interactions

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1-[2-(Carboxymethoxy)phenyl]-N-(4-chlorophenyl)methanimine oxide

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Bis[1-(isopropyl­ideneamino)guanidinium] bis­(3-nitro­benzoate) monohydrate

The asymmetric unit of the title salt hydrate, 2C4H11N4 +·2C7H4NO4 −·H2O, comprises two independent 1-(isopropyl­ideneamino)guanidinium cations, two independent 3-nitro­benzoate anions and a water mol­ecule of crystallization. There are minimal geometric differences between the two planar [maximum deviations 0.061 (2) and 0.088 (2) Å] cations, and between the two almost planar anions [C–C–C–O and C–C–N–O torsion angles of 0.3 (3) and 11.1 (4) °, respectively in the first anion and −173.7 (2) and −0.1 (4), respectively in the second anion]. Extensive O—H⋯O and N—H⋯O hydrogen bonding between all components of the structure leads to the formation of a two-dimensional array with an undulating topology in the bc plane

A kryptoracemic salt: 2-{[2,8-bis(trifluoromethyl)quinolin-4yl](hydroxy)methyl}piperidin-1-ium (+)-3,3,3-trifluoro-2-methoxy-2-phenylpropanoate

The asymmetric unit of the title salt, C17H17F6N2O+·C10H8F3O3-, comprises two piperidin-1-ium cations and two carboxyl­ate anions. The cations, each having an L-shaped conformation owing to the near orthogonal relationship between the quinolinyl and piperidin-1-ium residues, are pseudo-enanti­omeric. The anions have the same absolute configuration but differ in the relative orientations of the carboxyl­ate, meth­oxy and benzene groups. Arguably, the most prominent difference between the anions occurs about the Cq-Om bond as seen in the Cc-Cq-Om-Cm torsion angles of -176.1 (3) and -67.1 (4)°, respectively (q = quaternary, m = meth­oxy and c = carboxyl­ate). The presence of Oh-H...Oc and Np-H...Oc hydrogen bonds leads to the formation of a supra­molecular chain along the a axis (h = hy­droxy and p = piperidin-1-ium); weak intra­molecular Np-H...Oh hydrogen bonds are also noted. Chains are connected into a three-dimensional architecture by C-H...F inter­actions. Based on a literature survey, related mol­ecules/cations adopt a uniform conformation in the solid state based on the letter L

1-(4-Methyl­phen­yl)-3-phenyl-1H-pyrazol-5-yl 4-nitro­benzene­sulfonate

In the title mol­ecule, C22H17N3O5S, the pyrazole ring is planar (r.m.s. deviation = 0.018 Å) and forms dihedral angles of 21.45 (10) and 6.96 (10)° with the N- and C-bound benzene rings, respectively. Supra­molecular layers in the bc plane are formed in the crystal via C—H⋯O and π–π inter­actions involving the sulfonamide benzene ring inter­acting with the N- and C-bound benzene rings [centroid–centroid distances = 3.790 (2) and 3.730 (2) Å, respectively]. The crystal studied was found to be a merohedral twin (twin law 1 0 0.678, 0 -1 0, 0 0 -1), the fractional contribution of the minor component being approximately 36%

Between the point of view and the point of being: the space of the stereoscopic tours

One of the most interesting features of the travel stereoview series is not their three-dimensional effect but rather the intertwined outcome of realism and “being-thereness” in the experience of early twentieth century armchair travellers. On the set of Italy through the Stereoscope, the viewer’s “path of the gaze” was a novelty compared to two dimensional photographs and stereoviews. The Underwood & Underwood publishing company created a stereoscopic multimodal tour to improve the impression of realism with a proprioceptive perception of the scene. The procedure of textual débrayage, the description of the experience as it is happening here and now, the direction of the viewer’s gaze with a narrative itinerary, the changing of the visual convergence with the variation in the points of attention: all of these elements fostered a synaesthesia for the spectator. The result was immersion in an explorable space between the “point of view” (2D images) and the “point of being” (virtual reality)

Racemic mefloquinium chlorodifluoroacetate: Crystal structure and Hirshfeld surface analysis

In the racemic title molecular salt, C17H17F6N2O+.C2ClF2O3 -(systematic name:2-{[2,8-bis(trifluoromethyl)quinolin-4-yl](hydroxy)methyl}piperidin-1-ium chlorodifluoroacetate), the cation, which is protonated at the piperidine N atom, has the shape of the letter, L, with the piperidin-1-ium group being approximately orthogonal to the quinolinyl residue [the Cq—Cm—Cm–Na (q = quinolinyl; m = methine; a = ammonium) torsion angle is 177.79 (18)⁰]. An intramolecular, charge-assisted ammonium-N—H...O(hydroxyl) hydrogen bond ensures the hydroxy-O and ammonium-N atoms lie to the same side of the molecule [Oh—Cm—Cm—Na (h = hydroxyl) = -59.7 (2)⁰]. In the crystal, charge-assisted hydroxyl-O—H...O-(carboxylate) and ammonium-N+—H...O-(carboxylate) hydrogen bonds generate a supramolecular chain along [010]; the chain is consolidated by C—H...O interactions. Links between chains to form supramolecular layers are of the type C—Cl...π(quinolinyl-C6) and the layers thus formed stack along the a-axis direction without directional interactions between them. The analysis of the calculated Hirshfeld surface points to the dominance of F...H contacts to the surface (40.8%) with significant contributions from F...F (10.5%) and C...F (7.0%) contacts

(Dimethyl sulfoxide-κO)di­phenyl­(3-thioxo-3H-1,2-dithiole-4,5-dithiol­ato-κ2 S 4,S 5)tin(IV)

The Sn atom in the title compound, [Sn(C6H5)2(C3S5)(C2H6OS)], exists within a distorted trigonal-bipyramidal geometry defined by two S atoms of the 1,2-dithiole-3-thione-4,5-dithiol­ate dianion, two ipso-C atoms from the phenyl groups, and the O atom of the dimethyl sulfoxide mol­ecule. In this description, one of the S atoms and the O occupy axial positions. In the crystal, centrosymmetrically related mol­ecules associate via pairs of C—H⋯S contacts, forming dimeric aggregates

Crystal Structure of the Chiral Azomethine Imine, (Z)-(S)-4-(tert-Butylcarbonylamino)-2-(2-methoxybenzylidene)-5-oxopyrazolidin-2-ium-1-ide, Obtained by the Cyclization of tert-Butyl (S)-2-[2-(methoxybenzylidene)hydrazine]-1-(hydroxymethyl)-2-oxocarbamate

Open Access via Springer Compact Agreement. The use of the NCS crystallographic service at Southampton and the valuable assistance of the staff there are gratefully acknowledged. JLW thanks FAPERJ and CNPq, Brazil for support.Peer reviewedPublisher PD