scholarly journals Crystal structure of 2-methyl-1H-imidazol-3-ium hydrogen oxalate dihydrate

2016 ◽  
Vol 72 (8) ◽  
pp. 1113-1115 ◽  
Author(s):  
Mouhamadou Birame Diop ◽  
Libasse Diop ◽  
Laurent Plasseraud ◽  
Hélène Cattey
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Oxalic Acid ◽  
Single Crystals ◽  
Molar Ratio ◽  
Methyl Groups ◽  
Water Molecules ◽  
Oxalate Dihydrate ◽  
Molecular Salt

Single crystals of the title molecular salt, C4H7N2+·HC2O4−·2H2O, were isolated from the reaction of 2-methyl-1H-imidazole and oxalic acid in a 1:1 molar ratio in water. In the crystal, the cations and anions are positioned alternately along an infinite [010] ribbon and linked together through bifurcated N—H...(O,O) hydrogen bonds. The water molecules of crystallization link the chains into (10-1) bilayers, with the methyl groups of the cations organized in an isotactic manner.

scholarly journals Bis(tetraethylammonium) oxalate dihydrate

2012 ◽  
Vol 68 (8) ◽  
pp. o2382-o2383 ◽  
Author(s):  
Timothy J. McNeese ◽  
Robert D. Pike
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Dihedral Angle ◽  
Title Compound ◽  
Molar Ratio ◽  
Water Molecules ◽  
Oxalate Dihydrate ◽  
Carboxylate Groups ◽  
Graph Set ◽  
Oxalate Ion

The title compound, 2C8H20N+·C2O42−·2H2O, synthesized by neutralizing H2C2O4·2H2O with (C2H5)4NOH in a 1:2 molar ratio, is a deliquescent solid. The oxalate ion is nonplanar, with a dihedral angle between carboxylate groups of 64.37 (2)°. O—H...O hydrogen bonds of moderate strength link the O atoms of the water molecules and the oxalate ions into rings parallel to thecaxis. The rings exhibit the graph-set motifR44(12). In addition, there are weak C—H...O interactions in the crystal structure.

scholarly journals Crystal structure of the new hybrid material bis(1,4-diazoniabicyclo[2.2.2]octane) di-μ-chlorido-bis[tetrachloridobismuthate(III)] dihydrate

2015 ◽  
Vol 71 (11) ◽  
pp. 1384-1387
Author(s):  
Marwen Chouri ◽  
Habib Boughzala
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Hydrogen Bonds ◽  
Room Temperature ◽  
Molar Ratio ◽  
Water Molecules ◽  
Site Symmetry ◽  
Two Dimensional ◽  
Slow Evaporation ◽  
Solution Ph

The title compound bis(1,4-diazoniabicyclo[2.2.2]octane) di-μ-chlorido-bis[tetrachloridobismuthate(III)] dihydrate, (C6H14N2)2[Bi2Cl10]·2H2O, was obtained by slow evaporation at room temperature of a hydrochloric aqueous solution (pH = 1) containing bismuth(III) nitrate and 1,4-diazabicyclo[2.2.2]octane (DABCO) in a 1:2 molar ratio. The structure displays a two-dimensional arrangement parallel to (100) of isolated [Bi2Cl10]4−bioctahedra (site symmetry -1) separated by layers of organic 1,4-diazoniabicyclo[2.2.2]octane dications [(DABCOH2)2+] and water molecules. O—H...Cl, N—H...O and N—H...Cl hydrogen bonds lead to additional cohesion of the structure.

Komplexe mit substituierten 2,5-Dihydroxy-p-benzochinonen: EA[C6(NO2)2O4] · H2O (EA = Ca, Sr)/ Complexes with Substituted 2,5-D ihydroxy-p-benzoquinones: EA [C6(NO2)2O4] · 4H2O(EA = Ca, Sr)

1987 ◽  
Vol 42 (8) ◽  
pp. 972-976 ◽  
Author(s):  
Christian Robl
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Water Molecule ◽  
Single Crystals ◽  
Coordination Sphere ◽  
Trigonal Prism ◽  
Water Molecules ◽  
Additional Water ◽  
Oxygen Atoms

AbstractSingle crystals of EA[Q(NO2)2O4] · 4H2O (EA = Ca. Sr) were grown in aqueous silicagel. Ca2+ has CN 8. It is surrounded by 4 oxygen atoms of two bis-chelating [C6(NO2)2O4]2- ions and 4 water molecules, which form a distorted, bi-capped trigonal prism. Sr2+ is coordinated similarly, with an additional water molecule joining the coordination sphere to yield CN 8+1. Corrugated chains extending along [010] and consisting of EA2+ and nitranilate ions are the main feature of the crystal structure. Adjacent chains are interlinked by hydrogen bonds.

scholarly journals Crystal Structure and Characterization of Two Layered Copper(II) Coordination Polymers with Anions of 3-Phosphonopropionic Acid and (RS)-2-Phosphonobutyric Acid

2019 ◽  
Author(s):  
Roberto Köferstein
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Single Crystals ◽  
Magnetic Measurements ◽  
Antiferromagnetic Coupling ◽  
Water Molecules ◽  
Space Group ◽  
Thermoanalytical Investigations ◽  
Copper Cations

Blue single crystals of Cu[μ3-O3P(CH2)2COOH].2H2O (1) and Cu[(RS)-μ3-O3PCH(C2H5)COOH].3H2O (2) have been prepared in aqueous Cu2+-solutions (pH = 2.5–3.5) containing 3-phosphonopropionic acid (1) and (RS)-2-phosphonobutyric acid (2), respectively. 1: Space group Pbca (no. 61) with a = 812.5(2), b = 919.00(9), c = 2102.3(2) pm. Cu2+ is five-fold coordinated by three oxygen atomsstemming from [O3P(CH2)2COOH]2– anions and two water molecules. The Cu-O bond lengths range from194.0(3) to 231.8(4) pm. The connection between the [O3P(CH2)2COOH]2– anions and the Cu2+ cations yields apolymeric structure with layers parallel to (001). The layers are linked by hydrogen bonds. 2: Space group Pbca(no. 61) with a = 1007.17(14), b = 961.2(3), c = 2180.9(4) pm. The copper cations are surrounded by five oxygen atoms in a square pyramidal fashion with Cu-O bonds between 193.6(4) and 236.9(4) pm. The coordination between [O3PCH(C2H5)COOH]2- and Cu2+ results in infinite puckered layers parallel to (001). The layers are not connected by any hydrogen bonds. Each layer contains both R and S isomers of the [O3PCH(C2H5)COOH]2-dianion. Water molecules not bound to Cu2+ are intercalated between the layers.UV/Vis spectra suggest three d-d transition bands at 743, 892, 1016 nm for 1 and four bands at 741, 838, 957and 1151 nm for 2, respectively. Magnetic measurements suggest a weak antiferromagnetic coupling betweenCu2+ due to a super-superexchange interaction. Thermoanalytical investigations in air show that the compounds are stable up to 95 °C (1) and 65 °C (2), respectively.

scholarly journals Crystal structure of 3-(2-hydroxyethyl)-2-methylsulfanyl-6-nitro-3H-benzimidazol-1-ium chloride monohydrate

2016 ◽  
Vol 72 (9) ◽  
pp. 1356-1359
Author(s):  
Akoun Abou ◽  
Siomenan Coulibali ◽  
Rita Kakou-Yao ◽  
T. Jérémie Zoueu ◽  
A. Jules Tenon
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Heterocyclic Ring ◽  
Ring System ◽  
Water Molecules ◽  
Stacking Interactions ◽  
Benzene Rings ◽  
Related Compounds ◽  
Molecular Salt ◽  
Chloride Monohydrate

In the cation of the title hydrated molecular salt, C10H12N3O3S+·Cl−·H2O, the benzimidazolium ring system is almost planar (r.m.s. deviation = 0.006 Å) and the nitro group is inclined at an angle of 4.86 (9)° to this plane. In the crystal, C—H...O hydrogen bonds form centrosymmetricR22(20) dimers and these are further aggregated through N—H...O and O—H...Cl hydrogen bonds involving the water molecules and chloride anions. Aromatic π–π stacking interactions are also found between two parallel benzene rings or the benzene and imidazolium rings, with centroid–centroid distances of 3.5246 (9) and 3.7756 (9) Å, respectively. Analysis of the bond lengths and comparison with related compounds show that the nitro substituent is not involved in conjugation with the adjacent π-system and hence has no effect on the charge distribution of the heterocyclic ring.

Square network based upon the molecular salt of the tetraprotonated photoproduct rtct-tetrakis(pyridin-4-yl)cyclobutane and the sulfate anion

2021 ◽  
Vol 77 (9) ◽  
Author(s):  
Carlos L. Santana ◽  
Eric W. Reinheimer ◽  
Ryan H. Groeneman
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Crystalline Solid ◽  
Water Molecules ◽  
Sulfate Anion ◽  
Hydrogen Bonding Pattern ◽  
Metastable Form ◽  
Ring Structures ◽  
Molecular Salt

The formation and crystal structure of a hydrated molecular salt that results in a square network is reported. The crystalline solid is based upon the tetraprotonated photoproduct rtct-tetrakis(pyridin-4-yl)cyclobutane (4H- rtct -TPCB)4+ along with two sulfate anions (SO4 2−) and eight waters of hydration, namely, 4,4′,4′′,4′′′-(cyclobutane-1,2,3,4-tetrayl)tetrapyridinium bis(sulfate) octahydrate, C24H24N4 4+·2SO4 2−·8H2O. The fully protonated photoproduct acts as a four-connecting node within the square network by engaging in four charge-assisted N+—H...O hydrogen bonds to the sulfate anion. The observed hydrogen-bonding pattern in this square network is akin to T-silica, which is a metastable form of SiO2. The included water molecules and sulfate anions engage in numerous O—H...O hydrogen bonds to form various hydrogen-bonded ring structures.

scholarly journals Crystal structure ofrac-(3aR,4S,5aR,6S,9R,10aS,10bR)-3a,5a,9-trimethyltetradecahydro-6,9-epoxycyclohepta[e]inden-4-ol monohydrate

2015 ◽  
Vol 71 (9) ◽  
pp. o690-o691 ◽  
Author(s):  
Andreas Schäfer ◽  
Christopher Golz ◽  
Hans Preut ◽  
Carsten Strohmann ◽  
Martin Hiersemann
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Organic Molecules ◽  
Membered Ring ◽  
Methyl Groups ◽  
Water Molecules ◽  
Asymmetric Unit ◽  
Relative Configuration ◽  
Space Groups ◽  
A Chain

The title hydrate, C17H28O2·H2O, was synthesized in order to determine the relative configuration of the tetracyclic framework. The fused 5,6,7-tricarbocyclic core exhibits an entirecis-annulation, featuring a 1,4-cis-relation of the angular methyl groups in the six-membered ring. The oxa bridge of the epoxycycloheptane moiety is oriented towards the concave face of the boat-shaped molecule, whereas the angular methyl groups are directed towards the convex face. The asymmetric unit of the crystal contains two nearly identical formula units, which are relatedviaa pseudo-centre of symmetry. The structure could be solved in the space groupsI-4 andI41/a. The refinement in the acentric space group, however, gave significantly better results and these are used in this paper. O—H...O hydrogen bonds are observed between the organic molecules, between the organic molecules and the water molecules, and between the water molecules, forming a chain along thec-axis direction.

scholarly journals Crystal structure and Hirshfeld surface analysis of 2-(1H-indol-3-yl)ethanaminium acetate hemihydrate

2019 ◽  
Vol 75 (4) ◽  
pp. 451-455 ◽  
Author(s):  
Balakrishnan Rajeswari ◽  
Radhakrishnan Santhi ◽  
Palaniyappan Sivajeyanthi ◽  
Kasthuri Balasubramani
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Surface Analysis ◽  
Hirshfeld Surface ◽  
Water Molecules ◽  
Asymmetric Unit ◽  
Torsion Angles ◽  
Hirshfeld Surfaces ◽  
Molecular Salt ◽  
Hirshfeld Surfaces Analysis

The title molecular salt, C10H13N2 +·C2H3O2 −·0.5H2O, crystallized with four 2-(1H-indol-3-yl)ethanaminium cations (A, B, C and D) and four acetate anions in the asymmetric unit, together with two water molecules of crystallization. Each cation is linked to an anion by a C—H...π interaction. The alkylaminium side chains have folded conformations, with N—C—C—C torsion angles of −58.5 (3), 59.5 (3), −64.6 (3) and −56.0 (3)° for cations A, B, C and D, respectively. In the crystal, the cations and anions are liked by N—H...O and C—H...O hydrogen bonds, forming chains propagating along the b-axis direction. The chains are linked by the water molecules via Owater—H...O and N—H...Owater hydrogen bonds, forming layers lying parallel to the bc plane. The overall intermolecular interactions were investigated using Hirshfeld surfaces analysis.

scholarly journals Bis(L-serinium) oxalate dihydrate: polymorph II

2013 ◽  
Vol 69 (11) ◽  
pp. o1667-o1668 ◽  
Author(s):  
Marta Kulik ◽  
Aleksandra Pazio ◽  
Krzysztof Wozniak
Keyword(s):  
Hydrogen Bonds ◽  
Single Crystal ◽  
Dihedral Angle ◽  
Water Molecules ◽  
Crystal Data ◽  
Oxalate Dihydrate ◽  
Anisotropic Displacement Parameters ◽  
Molecular Salt

A corrected and improved structure of the polymorph II of 2C3H8NO3+·C2O42−·2H2O, based on single-crystal data, is presented. The structure is refined with anisotropic displacement parameters for all non-H atoms and all H atoms are located. Due to the charged moieties, the structure is classified as a molecular salt. Intermolecular O—H...O−, O—H...O and N+—H...O−hydrogen bonds link the components of the structure. The L-serinium cations and oxalate anions form a network of channels in [100] direction, filled with the water molecules of crystallization. The dihedral angle between the CO2units of the oxalate dianion is 10.2 (3)°

scholarly journals Crystal structure of 2-amino-4-methylpyridin-1-ium (2R,3R)-3-carboxy-2,3-dihydroxypropanoate monohydrate

2014 ◽  
Vol 70 (9) ◽  
pp. o1036-o1037 ◽  
Author(s):  
J. V. Jovita ◽  
S. Sathya ◽  
G. Usha ◽  
R. Vasanthi ◽  
A. Ramanand
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Tartaric Acid ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Water Molecules ◽  
Asymmetric Unit ◽  
Bond Forming ◽  
Molecular Salt

The title molecular salt, C6H9N2+·C4H5O6−·H2O, crystallized with two 2-amino-4-methylpyridin-1-ium cations, two L-(+)-tartaric acid monoanions [systematic name: (2R,3R)-3-carboxy-2,3-dihydroxypropanoate] and two water molecules in the asymmetric unit. In the crystal, the cations, anions and water molecules are linkedviaa number of O—H...O and N—H...O hydrogen bonds, and a C—H...O hydrogen bond, forming a three-dimensional structure

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