The Modulated Crystal Structure of the Molecular Adduct of 2,4,6-Trinitrobenzoic Acid with 2,6-Diaminopyridine

2000 ◽  
Vol 53 (6) ◽  
pp. 531 ◽  
Author(s):  
Graham Smith ◽  
Raymond C. Bott ◽  
A. David Rae ◽  
Anthony C. Willis
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Modulated Structure ◽  
Triclinic Space Group ◽  
X Ray Crystallography ◽  
Reflection Data ◽  
Low Temperature Crystal Structure ◽  
Molecular Adduct ◽  
A Cell ◽  
Index Condition

The 1 : 1 adduct of 2,4,6-trinitrobenzoic acid (tnba) with 2,6-diaminopyridine (2,6-dap), [(2,6-dap)+(tnba)-], has been prepared and the low-temperature crystal structure has been determined by X-ray crystallography. A modulated structure has been identified and refined by using a stacking fault model that requires reflection data to be put on three scales depending on an index condition. Crystals are triclinic, space group P1–, with Z 8 in a cell of dimensions a 13.538(3), b 14.516(4), c 16.480(4) Å; α 97.17(2), β 105.69(2), γ 106.09(2)˚. The structure involves proton transfer from the tnba molecule to the 2,6-dap molecule, with the resulting pyridinium proton and an amine proton interacting with the carboxyl oxygens of the tnba molecule in a primary cyclic hydrogen-bonding association. Additional peripheral hydrogen bonding completes a two-dimensional sheet structure.

Molecular Cocrystals of Carboxylic Acids.II. The Crystal Structure of the 1 : 2 Adduct of Phenoxyacetic Acid With 3,5-Dinitrobenzoic Acid

1991 ◽  
Vol 44 (7) ◽  
pp. 1017 ◽  
Author(s):  
DE Lynch ◽  
G Smith ◽  
KA Byriel ◽  
CHL Kennard
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Water Molecules ◽  
Phenoxyacetic Acid ◽  
X Ray Diffraction ◽  
Triclinic Space Group ◽  
X Ray ◽  
Molecular Adduct ◽  
A Cell

The 1 : 2 molecular adduct between phenoxyacetic acid and 3,5-dinitrobenzoic acid, with formula [(C6H5OCH2COOH)2{3,5-(NO2)2C6H3COOH}4(H2O)2], has been prepared and its structure determined by X-ray diffraction. Crystals are triclinic, space group Pī with two complex units in a cell with dimensions a 7.202(2), b 18.519(5), c 20.924(6)Ǻ, α 66.33(3),β 86.04(2),γ 89.32(2)°. The molecular repeating unit comprises two phenoxyacetic acid molecules [forming hydrogen-bonded cyclic dimers (O̷O, 2.71, 2.74 Ǻ)], four 3,5- dinitrobenzoic acid molecules [giving two unusual one-bond hydrogen bonds (O…O, 2.59, 2.64Ǻ)] and two water molecules. The waters are intimately involved in a hydrogen-bonding network with carboxylic acid oxygens.

Phosphinsubstituierte Chelatliganden, XIV [1]. Wasserstoff-Brückenbindung in THF-Addukten von Tetracarbonylchrom-und -molybdänkomplexen mit P,S-koordinierten Phosphinothioformamid-Liganden. Kristallstruktur von [(CO)4Cr(PPh2C(S)NHMe)] · THF Phosphine-Substituted Chelate Ligands, XIV [1]. Hydrogen Bonding in THF-Adducts of Tetracarbonylchromium and -molybdenum Complexes with P,S-Coordinated Phosphinothioformamide Ligands. Crystal Structure of [(CO)4Cr(PPh2C(S)NHMe)] · THF

1985 ◽  
Vol 40 (4) ◽  
pp. 512-517 ◽  
Author(s):  
Udo Kunze ◽  
Hussain Jawad ◽  
Wolfgang Hiller ◽  
Regina Naumer
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
Nmr Spectra ◽  
Chelate Complexes ◽  
Triclinic Space Group ◽  
Lattice Constants ◽  
H Nmr ◽  
Contact Distance ◽  
Metal Hexacarbonyls

The tetracarbonyl chromium and molybdenum P,S-chelate complexes 1a, b and 2a, b are obtained by low-temperature photolysis of the metal hexacarbonyls with the neutral phosphinothioformamide ligands, Ph2PC(S)NHR (R = Me (a). Ph (b)), as stoichiometric 1/1 IHF adducts. A weak N-H···O(THF) hydrogen bond is deduced from the 1H NMR spectra which show a collapse of the N-methyl doublet in la (Tc -18 °C) but not in 2a. Unusually small P-C(S) couplings are observed in the 13C{1H} NMR spectra. The N-methyl chromium complex la crystal­lizes in the triclinic space group P1 (Z = 2) with the lattice constants a = 1076.6(3), b = 1235.8(3), c = 915.1(3) pm, α = 97.99(4)°, β = 92.73(5)°, γ = 87.63(5)°. The planar thioamide unit adopts the Z configuration and is linked to the tetrahydrofuran molecule by a hydrogen bond (N-H1-O31 164°) with an O···H contact distance of 191 pm.

Inclusion compounds of thiourea and peralkylated ammonium salts. III. Hydrogen-bonded host lattices built of thiourea and nitrate ions

1996 ◽  
Vol 52 (6) ◽  
pp. 989-998 ◽  
Author(s):  
Q. Li ◽  
T. C. W. Mak
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Channel System ◽  
Nitrate Ion ◽  
Space Group ◽  
One Dimensional ◽  
X Ray Crystallography ◽  
Packing Arrangement ◽  
Host Lattices ◽  
Hydrogen Bonded

The new inclusion complexes tetraethylammonium nitrate–thiourea (1:3), (C2H5)4N+.NO3 −. 3(NH2)2CS (1), tetra-n-propylammonium nitrate–thiourea–water (1:3:1), (n-C3H7)4N+.NO3 −.3(NH2)2CS.H2O (2), tetramethylammonium nitrate–thiourea (1:1), (CH3)4N+.NO3 −.(NH2)2CS (3), tetra-n-propylammonium nitrate–thiourea (1:1), (n-C3H7)4N+.NO3 −. (NH2)2CS (4), and tetra-n-butylammonium nitrate–thiourea (1:1), (n-C4H9)4N+.NO3 −.(NH2)2CS (5) have been prepared and characterized by X-ray crystallography. Crystal data, Mo Kα: (1), space group P{\bar 1}, a = 10.300 (2), b = 14.704 (3), c = 15.784 (4) Å, α = 75.30 (3), β = 86.98 (3), γ = 72.25 (3)°, Z = 4 and RF = 0.039 for 5034 observed data; (2), space group P21/n, a = 8.433 (2), b = 9.369 (2), c = 34.361 (7) Å, β = 91.01 (3)°, Z = 4 and RF = 0.050 for 2475 observed data; (3), space group Pnma, a = 15.720 (3), b = 8.218 (2), c = 8.709 (2) Å, Z = 4 and RF = 0.073 for 579 observed data; (4), space group P21/n, a = 8.784 (2), b = 14.421 (3), c = 15.078 (3) Å, β = 92.31 (3)°, Z = 4 and RF = 0.046 for 2507 observed data; (5), space group Pna21, a = 19.934 (3), b = 12.680 (2), c = 9.092 (3) Å, Z = 4 and RF = 0.047 for 1646 observed data. In the crystal structure of (1) infinite chains each composed of an alternate arrangement of a twisted thiourea trimer and a nitrate ion are cross-linked to form a puckered layer and further hydrogen bonding between such layers leads to a channel host framework for accommodation of the cationic guests. In the crystal structure of (2) two independent thiourea molecules are used to construct a hydrogen-bonded puckered layer normal to the c axis, whereas the remaining thiourea molecule, together with the nitrate ion and water molecule, generate another puckered layer that is parallel to the first. Hydrogen bonding between these two types of layers gives rise to a channel system running parallel to the [100] direction and the cations are stacked regularly within each column. Compounds (3), (4) and (5) have closely related crystal structures in which the cations are separated by one-dimensional, infinitely extended thiourea–nitrate composite ribbons in a sandwich-like packing arrangement.

scholarly journals Low-temperature crystal structure of 4-chloro-1H-pyrazole

2021 ◽  
Vol 77 (9) ◽  
pp. 955-957
Author(s):  
Kelly Rue ◽  
Raphael G. Raptis
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Carbon Atom ◽  
Low Temperature ◽  
Chlorine Atom ◽  
Molecular Assembly ◽  
Mirror Plane ◽  
X Rays ◽  
Asymmetric Unit ◽  
Low Temperature Crystal Structure

The structure of 4-chloro-1H-pyrazole, C3H3ClN2, at 170 K has orthorhombic (Pnma) symmetry and is isostructural to its bromo analogue. Data were collected at low temperature since 4-chloro-1H-pyrazole sublimes when subjected to the localized heat produced by X-rays. The structure displays intermolecular N—H...N hydrogen bonding and the packing features a trimeric molecular assembly bisected by a mirror plane (m normal to b) running through one chlorine atom, one carbon atom and one N—N bond. The asymmetric unit therefore consists of one and one-half 4-chloro-1H-pyrazole molecules. Thus, the N—H proton is crystallographically disordered over two positions of 50% occupancy each.

Preparation of Rhenium Diamino Dithiolate Complexes. The X-Ray Crystal Structure of Oxo(1,1,8,8-tetraethyl-3,6-diazaoctane-1,8-dithiolato)rhenium

1993 ◽  
Vol 46 (7) ◽  
pp. 1093 ◽  
Author(s):  
TW Jackson ◽  
M Kojima ◽  
RM Lambrecht
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Intermolecular Hydrogen Bonding ◽  
X Ray ◽  
X Ray Crystallography ◽  
Dithiolate Complexes ◽  
Hydrogen Bonded

The complexes oxo (1,1,8,8-tetraethyl-3,6-diazaoctane-1,8-dithiolato)rhenium[ ReO ( tedadt )], oxo (1,1,8,8-tetraethyl-4,4-dimethyl-3,6-diazaoctane-1,8-dithiolato)rhenium [ ReO ( tedmdadt )] and (1,1,4,4,8,8-hexamethyl-3,6-diazaoctane-1,8-dithiolato) oxorhenium [ ReO ( hmdadt )] were prepared. The crystal structure of the complex ReO ( tedadt ) was determined by X-ray crystallography to be a hydrogen-bonded dimer . This is the first example of intermolecular hydrogen bonding in rhenium diamino dithiolate ( dadt ) complexes.

Crystal Structures of (3S*,4S*,5S*,6S*)-3,4-Epoxy- 1,7-dioxaspiro[5.5]undecan-5-ol, (3R*,5S*,6S*)-1,7- Dioxaspiro[5.5]undecane-3,5-diyl Diacetate and (4S*,5S*,6S*)-1,7-Dioxaspiro[5.5]undecane-4,5-diol

1997 ◽  
Vol 50 (2) ◽  
pp. 123
Author(s):  
Margaret A. Brimble ◽  
Andrew Johnston ◽  
Trevor W. Hambley ◽  
Peter Turner
Keyword(s):  
Hydrogen Bonding ◽  
Hydroxy Group ◽  
Axial Position ◽  
Monoclinic Space Group ◽  
Equatorial Position ◽  
Intermolecular Hydrogen Bonding ◽  
Orthorhombic Space Group ◽  
Triclinic Space Group ◽  
Space Group ◽  
X Ray Crystallography

The structures of (3S*,4S*,5S*,6S*)-3,4-epoxy-1,7-dioxaspiro[5.5]undecan-5-ol (2), (3R*,5S*,6S*)-1,7- dioxaspiro[5.5]undecane-3,5-diyl diacetate (4) and (4S*,5S*,6S*)-1,7-dioxaspiro[5.5]undecane-4,5-diol (5) have been determined by X-ray crystallography. The unsubstituted tetrahydropyran ring in (2) adopts an axial position with respect to the epoxy-substituted ring and the hydroxy group at C5 is syn to the epoxide group. Intermolecular hydrogen bonding is observed between the C5 hydroxy group and O1. The two six-membered rings in (4) adopt chair conformations and the two acetate groups adopt 1,3-diaxial positions. The C5 hydroxy group in (5) assumes an axial position anti to the C-O bond of the neighbouring ring whilst 4-OH occupies an equatorial position. Intermolecular hydrogen bonding is also observed between 4-OH and 5-OH. Compound (2), C9H14O4, M 186·21, crystallized in the monoclinic space group P 21/c with a 7·867(1), b 12·2060(9), c 9·3676(8) Å, b 102·744(8), V 877·4(1) Å 3 and No 1163 [I > 2·5s (I)], R 0·031, Rw 0·035. Compound (4), C13H20O6, M 272·30, crystallized in the triclinic space group P 1 with a 9·902(1), b 11·0024(9), c 6·9183(5)Å, a 104·078(8), b 96·769(9), g 101·980(8), V 703·8(1) Å 3 , No 1657 [I > 2·5s(I)], R 0·047, Rw 0·044. Compound (5), C9H16O4, M 188·22, crystallized in the orthorhombic space group Pbca with a 25·504(3), b 8·909(2), c 8·038(2) Å, V 1826·4(5) QA 3 , No 1096 [I > 2·5s(I)], R 0·030, Rw 0·030.

1,1-Diphenylbutane-1,3-diol: the First Structurally Characterized Example of an Intramolecularly Hydrogen-Bonded Open-Chain 1,3-diol

1996 ◽  
Vol 49 (11) ◽  
pp. 1251
Author(s):  
CF Carvalho ◽  
DP Arnold ◽  
RC Bott ◽  
G Smith
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Orthorhombic Space Group ◽  
Open Chain ◽  
Space Group ◽  
A Cell ◽  
Intramolecular Hydrogen ◽  
Hydroxy Groups ◽  
Hydrogen Bonded

The crystal structure of the asymmetric 1,3-diol 1,1-diphenylbutane-1,3-diol has been determined and refined to a residual R of 0.039 for 795 observed reflections. Crystals are orthorhombic, space group P212121, with four molecules in a cell of dimensions a 9.625(4), b 16.002(3), c 8.834(3) Ǻ. The compound is unique among the known crystallographically characterized open-chain 1,3-diols in having only intramolecular hydrogen bonding involving the hydroxy groups [O-- -O 2.602(5) Ǻ].

Preparation, Crystal Structure and Spectroscopic Characterization of [Ga(OH)(SO4)(terpy)(H2O)] · H2O (terpy=2,2’:6’,2-Terpyridine): The First Characterized Gallium(III) Sulfato Complex

2004 ◽  
Vol 59 (3) ◽  
pp. 291-297 ◽  
Author(s):  
Andreas Sofetis ◽  
Giannis S. Papaefstathiou ◽  
Aris Terzis ◽  
Catherine P. Raptopoulou ◽  
Theodoros F. Zafiropoulos
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Nmr Spectroscopy ◽  
Good Yield ◽  
Spectroscopic Data ◽  
Spectroscopic Characterization ◽  
X Ray ◽  
X Ray Crystallography ◽  
H Nmr

The reaction of Ga2(SO4)3·18H2O and excess 2,2′:6′,2″-terpyridine (terpy) in MeOH / H2O leads to [Ga(OH)(SO4)(terpy)(H2O)]·H2O (1·H2O] in good yield. The structure of the complex has been determined by single-crystal X-ray crystallography. The GaIII atom in 1·H2O is 6-coordinate and ligation is provided by one terdentate terpy molecule, one monodentate sulfate, one terminal hydroxide and one terminal H2O molecule; the coodination polyhedron about the metal is described as a distorted octahedron. There is an extensive hydrogen-bonding network in the crystal structure which generates corrugated layers parallel to bc. The new complex was characterized by IR and 1H NMR spectroscopy. The spectroscopic data are discussed in terms of the nature of bonding

A complex of gallium with a Schiff base - bis(orthoquinone) ligand

1999 ◽  
Vol 77 (4) ◽  
pp. 502-510 ◽  
Author(s):  
Martyn A Brown ◽  
Jesus A Castro ◽  
Bruce R McGarvey ◽  
Dennis G Tuck
Keyword(s):  
Schiff Base ◽  
Liquid Ammonia ◽  
Aqueous Ammonia ◽  
Tridentate Ligand ◽  
Triclinic Space Group ◽  
X Ray ◽  
X Ray Crystallography ◽  
Spin Resonance ◽  
Aerial Oxidation ◽  
A Cell

The electrochemical oxidation of gallium in a cell containing a solution of 3,5-di-tert-butylcatechol (H2dbc) in a mixture of liquid ammonia and diethyl ether gives rise to the complex Ga(dbqdi)2, where dbqdi is a tridentate ligand formed by the condensation of two molecules of H2dbc and ammonia. The same paramagnetic molecule can be prepared by treating GaCl3 with H2dbc in ethanol with concentrated aqueous ammonia, with subsequent aerial oxidation. The crystal parameters are triclinic, space group P[Formula: see text], a = 11.6140(8), b = 12.3415(9), c = 20.765(1) Å, α = 89.491(1)°, β = 74.287(1)°, γ = 75.748(1)°, Z = 2, and R = 0.0542 for 7578 unique reflections. The structure, which is based on a GaO4N2 kernel, is discussed on the basis of crystallographic and ESR results.Key words: gallium, electrochemical synthesis, electron spin resonance, X-ray crystallography.

Crystal Structure and Chirality of the Ansamycin Antibiotic Actamycin

1991 ◽  
Vol 44 (5) ◽  
pp. 655 ◽  
Author(s):  
TW Hambley ◽  
V Parthasarathi ◽  
RW Rickards ◽  
GB Robertson
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Double Bond ◽  
Least Squares ◽  
Absolute Configuration ◽  
Torsion Angle ◽  
Title Compound ◽  
Intermolecular Hydrogen Bonding ◽  
Triclinic Space Group ◽  
Relative Stereochemistry

The structure of the title compound has been determined from diffractometer data recorded, initially, at 294 K and, subsequently, at 168 K. Crystals are triclinic, space group P1 with (168 K values in square brackets) a 16.080(2) [15.934(2)], b 15.958(2) [15.880(2)], c 8.443(2)Ǻ [8.233(1)Ǻ], α 85.55(1) [86.04(1)],β 82.65(1) [82.56(1)],γ 85.00(1)° [84.73(1)°], and contain two actamycin and two solvent ( tetrahydrofuran ) molecules in the asymmetric scattering unit. The structure was solved with DIRDIF and refined by block-diagonal least-squares analysis (of 168 K data) to R 0.049 ( wR 0.069) for 5640 reflections and 940 refined parameters. Molecules of actamycin (30-dechloro-2-demethyl-30-hydroxynaphthomycin A) exhibit the same relative stereochemistry (8S*,9S*,15S*,18S*,19S*,20S*) and double-bond configuration (2Z,4Z,6E,12E,16E,21E) as reported for crystalline 25-O-methylnaphthomycin A iminomethyl ether but are quite differently conformed. The two crystallographically inequivalent actamycin molecules in the present structure also exhibit substantial conformational (torsion angle) differences due, apparently, to the effects of intermolecular hydrogen bonding. Consideration of chiroptical data defines the absolute configuration of actamycin as 8S,9S,15S,18S,19S,20S and the helicity as P, as in naphthomycin A.

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