Temperature- and solvate-dependent disorder in the crystal structure of [PNP]+[HSO4]−

2019 ◽  
Vol 74 (4) ◽  
pp. 373-379
Author(s):  
Carsten Jenne ◽  
Marc C. Nierstenhöfer
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
Hydrogen Bonds ◽  
Single Crystals ◽  
Vibrational Spectroscopy ◽  
Diethyl Ether ◽  
Water Yield ◽  
Decomposition Products ◽  
Partial Decomposition

AbstractMetathesis reactions of [PNP]Cl ([PNP]+ ≡ bis(triphenyl-λ5-phosphanylidene)ammonium) with Na2[SO4] or K[HSO4] in water yield [PNP]2[SO4] and [PNP][HSO4], respectively, as colorless solids. Reactions under basic conditions lead to a partial decomposition of the weakly coordinating [PNP]+ cation. N-Diphenylphosphine-triphenylphosphazene, triphenylphosphinimine, and benzene were identified as decomposition products by NMR spectroscopy. The compounds [PNP]2[SO4] and [PNP][HSO4] were characterized by multinuclear NMR and vibrational spectroscopy. [PNP][HSO4] could be crystallized from acetonitrile-diethyl ether giving single crystals with and without additional acetonitrile solvate molecules. The [HSO4]− anions form dimers in the solid state in both structures, which are held together by O–H⋯O hydrogen bonds. At T = 127 K the [HSO4]− anions in the crystal structure of solvate free [PNP][HSO4] are ordered, while at T = 300 K and in the structure containing additional acetonitrile solvate molecules a disorder of the [HSO4]− anions over two positions is observed, for the latter even at 150 K.

scholarly journals Hydrogen-Bonded Networks Based on Cobalt(II), Nickel(II), and Zinc(II) Complexes of N,N'-Diethylurea

2010 ◽  
Vol 2010 ◽  
pp. 1-12 ◽  
Author(s):  
Labrini Drakopoulou ◽  
Catherine P. Raptopoulou ◽  
Aris Terzis ◽  
Giannis S. Papaefstathiou
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Hydrogen Bonds ◽  
Vibrational Spectroscopy ◽  
Supramolecular Structures ◽  
Counter Ion ◽  
Structure Determinations ◽  
Hydrogen Bonded

N,N'-diethylurea (DEU) was employed as a ligand to form the octahedral complexes[M(DEU)6]2+(M=Co, Ni and Zn). Compounds[Co(DEU)6](BF4)2(1),[Co(DEU)6](CIO4)2(2),[Ni(DEU)6](CIO4)2(3), and[Zn(DMU)6](CIO4)2(4) have been prepared from the reactions of DEU and the appropriate hydrated metal(II) salts in EtOH in the presence of 2,2-dimethoxypropane. Crystal structure determinations demonstrate the existence of[M(DEU)6]2+cations andCIO4-(in2–4) orBF4-(in1) counterions. The[M(DEU)6]2+cations in the solid state are stabilized by apseudochelateeffect due to the existence of six strong intracationicN-H⋯O(DEU)hydrogen bonds. The[M(DEU)6]2+cations and counterions self-assemble to form hydrogen-bonded 2D architectures in2–4that conform to thekgd(kagome dual) network, and a 3D hydrogen-bondedrtl(rutile) network in1. The nature of the resulting supramolecular structures is influenced by the nature of the counter-ion. The complexes were also characterized by vibrational spectroscopy (IR).

Kristallstruktur, thermische Zersetzung und Schwingungsspektrum von Ethylendiammonium-pentafluoromanganat(III), enH2MnF5 / Crystal Structure, Thermal Decomposition and Vibrational Spectrum of Ethylenediammonium-pentafluoromanganate(III), enH2MnF5

1992 ◽  
Vol 47 (6) ◽  
pp. 789-794 ◽  
Author(s):  
Ursula Bentrup ◽  
Ludger Schröder ◽  
Werner Massa
Keyword(s):  
Crystal Structure ◽  
Thermal Decomposition ◽  
Hydrogen Bonds ◽  
Vibrational Spectrum ◽  
Single Crystals ◽  
X Ray Diffraction ◽  
Decomposition Products ◽  
X Ray ◽  
Jahn Teller ◽  
Jahn Teller Effect

Single crystals of enH2MnF5 (en = ethylenediamine) have been prepared from aqueous HF solution and the crystal structure was determined by X-ray diffraction: space group Cccm, Z = 16, a = 1710.5(4), b = 1799.2(4), c = 847.8(2) pm, R/wR = 0.040/0.028 for 977 reflections. The structure consists of kinked [MnF5]2-- chains built by MnF6 octahedra sharing trans vertices (angles Mn-F-Mn 161.2 and 157.8°). The bridging Mn-Fax bonds are strongly elongated by the Jahn-Teller effect (mean Mn-Fax 215.4, Mn-F 183.8 pm). Each of the enH22+ cations is connected to four anionic chains by hydrogen bonds forming a 3 D network. Thermal decomposition occurs between 200 and 380 °C in two steps giving finally MnF2. The IR spectra of enH2MnF5 and its decomposition products are reported.

Model compounds of aromatic nylons. 3. The conformation of the 4T Nylon, poly(tetramethylene terephthalamide), using X-ray diffraction, solid-state 13C nmr spectroscopy and ir spectroscopy

1989 ◽  
Vol 67 (5) ◽  
pp. 840-849 ◽  
Author(s):  
Josée Brisson ◽  
Johanne Gagné ◽  
François Brisse
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
Hydrogen Bonds ◽  
Solid State Nmr ◽  
13C Nmr Spectroscopy ◽  
X Ray Diffraction ◽  
Model Compounds ◽  
X Ray ◽  
Structure Determinations

Three model compounds of poly(tetramethylene terephthalamide) or 4T Nylon have been synthesized and characterized using single crystal X-ray diffractometry, infrared spectroscopy, and 13CCP/MAS nmr spectroscopy. The model compounds are the para-substituted N,N′-tetramethylene dibenzamides, where the substituents are the—OMe, —tBu, —CN, and —CH3 groups. The crystal structure determinations reveal three distinct conformations for the CO—NH—(CH2)4—NH—CO sequence of atoms. The conformation is all trans for OMe, tgtttg−t for the tBu substituent, and tsttts−t for the CN substituent ([Formula: see text], [Formula: see text], and [Formula: see text]). In all three derivatives, the dihedral angle between the aromatic ring and the amide plane is around 30°. The OMe and tBu para-substituted molecules are interconnected by nearly linear hydrogen bonds of normal N … O distances. However, for the CN derivative the N … O distance is exceptionally short, 2.402(4) Å. On the basis of its infrared and solid state nmr spectra, it is proposed that N,N′-tetramethylene di-para-methyl benzamide has a crystal structure comparable to that of its unsubstituted analog. The methylenic sequence of the parent polyamide, 4T Nylon, has the tgtttg−t conformation. Furthermore, the polyamide chains form sheets within which the chains, parallel to one another, are connected through hydrogen bonds. Keywords: polyamide, crystal structure, solid-state nmr.

scholarly journals Organotin(IV) selenate derivatives – Crystal structure of [{(Ph3Sn)2SeO4} ⋅ CH3OH] n

2021 ◽  
Vol 44 (1) ◽  
pp. 213-217
Author(s):  
Waly Diallo ◽  
Hélène Cattey ◽  
Laurent Plasseraud
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Hydrogen Bonds ◽  
Point Of View ◽  
Intermolecular Hydrogen Bonds

Abstract Crystallization of [(Ph3Sn)2SeO4] ⋅ 1.5H2O in methanol leads to the formation of [{(Ph3Sn)2SeO4} ⋅ CH3OH] n (1) which constitutes a new specimen of organotin(IV) selenate derivatives. In the solid state, complex 1 is arranged in polymeric zig-zag chains, composed of alternating Ph3Sn and SeO4 groups. In addition, pendant Ph3Sn ⋅ CH3OH moieties are branched along chains according to a syndiotactic organization and via Sn-O-Se connections. From a supramolecular point of view, intermolecular hydrogen bonds established between the selenate groups (uncoordinated oxygen) and the hydroxyl functions (CH3OH) of the pendant groups link the chains together.

Zum Mineral Johillerit verwandte Oxovanadate RbCd4V3O12 und TlCd4V3O12 / Oxovanadates RbCd4V3O12 and TlCd4V3 O12 Related to the Mineral Johillerite

1997 ◽  
Vol 52 (5) ◽  
pp. 663-668 ◽  
Author(s):  
B. Mertens ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Solid State Reactions ◽  
Space Group ◽  
Related Compounds

Abstract Single crystals of I RbCd4V3O12 and TlCd4V3O12 II have been prepared by solid state reactions in closed iron tubes. The compounds crystallize closely related to the Johillerite structure in the space group C62h- C2/c with I: a = 13.058(3); b - 13.528(3), c = 7 .0 6 0 (2 )Å , β = 114.88(2)°; II: a = 12.999(6), b = 13.527(7), c = 7.055(3) Å , β = 114.88(4)°, Z = 4. Special features are the loss of Cu2+ in order to gain an additional Cd2+ position. The crystal structure is discussed with respect to related compounds of the Johillerite type.

High resolution triple resonance micro magic angle spinning NMR spectroscopy of nanoliter sample volumes

2016 ◽  
Vol 18 (6) ◽  
pp. 4902-4910 ◽  
Author(s):  
J. Ole Brauckmann ◽  
J. W. G. (Hans) Janssen ◽  
Arno P. M. Kentgens
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
High Resolution ◽  
Single Crystals ◽  
Solid State Nmr ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Triple Resonance ◽  
Angle Spinning

To be able to study mass-limited samples and small single crystals, a triple resonance micro-magic angle spinning (μMAS) probehead for the application of high-resolution solid-state NMR of nanoliter samples was developed.

scholarly journals 1,1′,3,3′-Tetramesitylquinobis(imidazole)-2,2′-dithione

IUCrData ◽  
2019 ◽  
Vol 4 (9) ◽  
Author(s):  
Jayaraman Selvakumar ◽  
Kuppuswamy Arumugam
Keyword(s):  
Crystal Structure ◽  
Molecular Weight ◽  
Solid State ◽  
Structural Analysis ◽  
Hydrogen Bonds ◽  
Cell Volume ◽  
Title Compound ◽  
Unit Cell Volume ◽  
Density Peaks ◽  
Solvent Molecules

The solid-state structural analysis of the title compound [systematic name: 5,11-disulfanylidene-4,6,10,12-tetrakis(2,4,6-trimethylphenyl)-4,6,10,12-tetraazatricyclo[7.3.0.03,7]dodeca-1(9),3(7)-diene-2,8-dione], C44H44N4O2S2 [+solvent], reveals that the molecule crystallizes in a highly symmetric cubic space group so that one quarter of the molecule is crystallographically unique, the molecule lying on special positions (two mirror planes, two twofold axes and a center of inversion). The crystal structure exhibits large cavities of 193 Å3 accounting for 7.3% of the total unit-cell volume. These cavities contain residual density peaks but it was not possible to unambiguously identify the solvent therein. The contribution of the disordered solvent molecules to the scattering was removed using a solvent mask and is not included in the reported molecular weight. No classical hydrogen bonds are observed between the main molecules.

scholarly journals Zur Kenntnis eines Barium-Oxoniobat-Tellurats: Ba2Nb2TeO10 / On a Barium-Oxoniobate-Tellurate: Ba2Nb2TeO10

1996 ◽  
Vol 51 (10) ◽  
pp. 1407-1410 ◽  
Author(s):  
B. Wedel ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Solid State Reactions ◽  
Orthorhombic Symmetry ◽  
X Ray ◽  
Lattice Constants ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of Ba2Nb2TeO10) have been prepared by solid state reactions in air. X-ray investigations led to orthorhombic symmetry, space group D152h-Pbca, a = 7.242(4), b = 12.433(3), c = 9.932(3) Å. Z = 4. Nb5+ and Te6+ show octahedral coordination by O2- . The crystal structure is characterized by planes of edge- and corner-sharing NbO6- and TeO6octahedra. It is shown that in spite of nearly identical lattice constants of Ba2Nb2TeO10 with compounds of the composition M0,5BaNbTe2O9 the so far unknown crystals of these substances may not be derived from the Ba2Nb2TeO10 type.

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