1,478 research outputs found
(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
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