(2-Hydroxy­ethyl)(prop­yl)aza­nium 2-[(2-carboxy­phen­yl)disulfan­yl]benzoate monohydrate

With the exception of the terminal hydr­oxy group [N—C—C—O = 53.8 (5)°], the cation of the title salt hydrate, C5H14NO+·C14H9O4S2 −.H2O, is a straight chain. A twisted conformation is found for the anion [C—S—S—C = −87.44 (16)°]. In the crystal, the anions self-assemble into a helical supra­molecular chain via charge-assisted O—H⋯Oc hydrogen bonds. These chains are connected into a three-dimensional network via N—H⋯Oc, N—H⋯Ow, Oh—H⋯Ocb, and Ow—H⋯Oc hydrogen-bonding inter­actions (c = carboxyl­ate, w = water, h = hydr­oxy and cb = carbon­yl)

Bis[eth­yl(2-hydroxy­ethyl)aza­nium] 2,2′-disulfanediyldibenzoate

The asymmetric unit of the title salt, 2C4H12NO+·C14H8O4S2 2−, contains an eth­yl(2-hydr­oxy)aminium cation and half a 2,2′-disulfanediyldibenzoate anion, with the latter disposed about a twofold axis. The cation is a straight chain with the exception of the terminal hydr­oxy group [the N—C—C—O torsion angle is 66.5 (2)°]. A twisted conformation is found for the anion [the C—S—S—C torsion angle is 91.51 (9)° and the dihedral angle between the rings is 81.01 (4)°]. A supra­molecular chain with base vector [101] and a tubular topology is formed in the crystal structure mediated by charge-assisted O—H⋯O− and N+—H⋯O− hydrogen bonding

2,2′-Imino­diethanaminium 2,2′-(disulfanyldi­yl)dibenzoate dihydrate

In the title hydrated salt, C4H15N3 2+·C14H8O4S2 −·2H2O, the dication (with both terminal –NH2 groups protonated) adopts a U-shaped conformation, the Namine—C—C—Naza­nium torsion angles being 57.9 (6) and 60.3 (6)°. The dianion is twisted: the central C—S—S—C torsion angle is 81.3 (2)° and the dihedral angle between the benzene rings is 85.4 (3)°. In the crystal, a chain in the a-axis direction mediated by water–carboxyl­ate O—H⋯O hydrogen bonds through a sequence of alternating 12-membered {⋯OCO⋯HOH}2 and eight-membered {⋯O⋯HOH}2 synthons occurs, which involves only one of the carboxyl­ate residues. The second carboxyl­ate residue participates in N—H⋯O hydrogen bonding, generating a three-dimensional network, along with aza­nium–water N—H⋯O hydrogen bonds

2,2′-(Disulfanedi­yl)dibenzoic acid–2,9-dimethyl­phenanthroline–tetra­hydro­furan (1/2/1)

The asymmetric unit of the title co-crystal solvate, C14H10O4S2·2C14H12N2·C4H8O, comprises a 2,2′-(disulfanedi­yl)dibenzoic acid mol­ecule, two mol­ecules of 2,9-dimethyl­phenanthroline and a tetra­hydro­furan (THF) solvent mol­ecule. Each end of the twisted diacid [dihedral angle between the benzene rings = 74.33 (17)°] forms a strong O—H⋯N hydrogen bond with a 2,9-dimethyl­phenanthroline mol­ecule, forming a trimeric aggregate. The crystal structure comprises layers of acid and THF mol­ecules, and layers of 2,9-dimethyl­phenanthroline mol­ecules that alternate along the a axis, the main connections between them being of the type C—H⋯O

2,2′-(Disulfanedi­yl)dibenzoic acid–N,N′-bis­(4-pyridyl­meth­yl)ethane­dithio­amide (1/1)

The asymmetric unit of the title co-crystal, C14H14N4S2·C14H10O4S2, comprises a twisted 2,2′-(disulfanedi­yl)dibenzoic acid mol­ecule [dihedral angle between the benzene rings = 83.53 (14)°] and a U-shaped mol­ecule of N,N′-bis­(4-pyridyl­meth­yl)ethane­dithio­amide in which intra­molecular N—H⋯S hydrogen bonds are observed. Two mol­ecules of each form a centrosymmetric ring, with an extended chair conformation, mediated by carbox­yl–pyridine O—H⋯N hydrogen bonds between the carboxylic acid groups of two 2,2′-(disulfanediyl)dibenzoic acid molecules and pyridine-N atoms of two N,N’-bis(4-pyridylmethyl)ethanedithioamide molecules. The tetra­meric aggregates are linked into a supra­molecular chain along the b axis via amide–carbonyl N—H⋯O hydrogen bonds

2-(4-Chloro­phen­yl)acetic acid–2-{(E)-[(E)-2-(2-pyridyl­methyl­idene)hydrazin-1-yl­idene]meth­yl}pyridine (1/1)

In the crystal of the title 1:1 adduct, C8H7ClO2·C12H10N4, the components are linked by an O—H⋯N hydrogen bond between the carb­oxy­lic acid and one of the pyridine N atoms. In the acid, the carb­oxy­lic acid group is approximately normal to [dihedral angle = 72.9 (2)°] but twisted with respect to the plane through the benzene ring [C—C—C—O torsion angle = 25.4 (5)°]. The base is roughly planar [dihedral angle between rings = 12.66 (15)°; r.m.s. deviation of the 16 non-H atoms = 0.107 Å] and the conformations about both imine bonds are E. The dimeric aggregates are linked into a supra­molecular layer in the ab plane by C—H⋯O inter­actions

Bis[N-2-hydroxyethyl,N-methyldithiocarbamato-κ2 S,S)'-4-{[(pyridin-4-ylmethylidene)hydrazinylidene}methyl]pyridine-κN 1)zinc(II): crystal structure and Hirshfeld surface analysis

In the title compound, [Zn(C4H8NOS2)2(C12H10N4)], the ZnII atom exists within a NS4 donor set defined by two chelating dithiocarbamate ligands and a pyridyl-N atom derived from a terminally bound 4-pyridinealdazine ligand. The distorted coordination geometry tends towards square-pyramidal with the pyridyl-N atom occupying the apical position. In the crystal, hydroxyl-O—H...O(hydroxyl) and hydroxyl-O—H...N(pyridyl) hydrogen-bonding give rise to a supramolecular double-chain along [1-10]; methyl-C—H...π(chelate ring) interactions help to consolidate the chain. The chains are connected into a three-dimensional architecture via pyridyl-C—H...O(hydroxyl) interactions. In addition to the contacts mentioned above, the Hirshfeld surface analysis points to the significance of relatively weak π–π interactions between pyridyl rings [inter-centroid distance = 3.901 (3) Å]

Characteristics of seismic survey pulses and the ambient soundscape in Baffin Bay and Melville Bay, West Greenland

In 2012 a seismic survey campaign involving four vessels was conducted in Baffin Bay, West Greenland. Long-distance (150 km) pre-survey acoustic modeling was performed in accordance with regulatory requirements. Four acoustic recorders, three with hydrophones at 100, 200, and 400m depths, measured ambient and anthropogenic sound during the survey. Additional recordings without the surveys were made from September 2013 to September 2014. The results show that (1) the soundscape of Baffin Bay is typical for open ocean environments and Melville Bay's soundscape is dominated by glacial ice noise; (2) there are distinct multipath arrivals of seismic pulses 40 km from the array; (3) seismic sound levels vary little as a function of depth; (4) high fidelity pre-survey acoustic propagation modeling produced reliable results; (5) the daily SEL did not exceed regulatory thresholds and were different using Southall, Bowles, Ellison, Finneran, Gentry, Greene, Kastak, Ketten, Miller, Nachtigall, Richardson, Thomas, and Tyack [(2007) Aquat. Mamm. 33, 411-521] or NOAA weightings [National Marine Fisheries Service (2016). NOAA Technical Memorandum NMFS-OPR-55, p. 178]; (6) fluctuations of SPL with range were better described by additive models than linear regression; and (7) the survey increased the 1-min SPL by 28 dB, with most of the energy below 100 Hz; energy in the 16 000 Hz octave band was 20 dB above the ambient background 6 km from the source. (C) 2017 Acoustical Society of America

3-[3-(trifluoromethyl)phenyliminomethyl]benzene-1,2-diol

The crystal packing of the essentially planar molecules of the title compound, C14H10F3NO2, is stabilized by O - (HO)-O-... hydrogen bonds and possible C - (HO)-O-... and C - (HF)-F-... interactions

N-formyl-N '-(2-oxidobenzylidene) hydrazine-kappa(3) O, N, O '] diphenyltin(IV)

The title compound, [Sn(C6H5)(2)(C8H6N2O2)], features a five-coordinate C2NO2 coordination geometry for Sn that is intermediate between trigonal-bipyramidal and square-pyramidal