The X-ray crystal structure of bis(glycinohydroxamato)nickel(II). A novel co-ordination of nickel by a hydroxamic acid via the nitrogen atom of the NHOH group

1982 ◽  
pp. 676 ◽  
Author(s):  
David A. Brown ◽  
Andrew L. Roche ◽  
Tapani A. Pakkanen ◽  
Tuula T. Pakkanen ◽  
Kimmo Smolander
Keyword(s):  
Crystal Structure ◽  
Nitrogen Atom ◽  
Hydroxamic Acid ◽  
X Ray

Synthese und Kristallstruktur des Dichloroselenonitren-Komplexes (PPh4)2[WCl5(NSeCl2)] / Synthesis and Crystal Structure of the Dichloro-selenonitrene Complex (PPh4)2[WCl5(NSeCl2)]

1992 ◽  
Vol 47 (3) ◽  
pp. 301-304 ◽  
Author(s):  
Stefan Vogler ◽  
Kurt Dehnicke
Keyword(s):  
Crystal Structure ◽  
Nitrogen Atom ◽  
Structure Determination ◽  
Selenium Atom ◽  
Tungsten Atom ◽  
Chlorine Atoms ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Trigonal Bipyramidal ◽  
Distorted Octahedral

The title compound has been prepared by the reaction o f [WCl4(NSeCl)]2 with PPh4Cl in CH2Cl2 solution. It forms red crystals, which were characterized by an X-ray structure determination. Space group P21/c, Z = 4, 3856 observed unique reflections, R = 0.073. Lattice dimensions at 25 °C: a = 2266.0(5), b = 1121.0(2), c = 2013.0(4) pm, β = 109.66(3)°. The structure consists o f PPh4+ ions and anions [WCl5(NSeCl2)]2-, in which the tungsten atom is surrounded in a distorted octahedral way by five chlorine atoms and by the nitrogen atom of the (NSeCl2)3- ligand. The W = N = SeCl2 group is characterized by WN and SeN double bonds; the selenium atom has a pseudo trigonal-bipyramidal coordination with the N atom and two lone pairs in equatorial and the chlorine atoms in axial positions.

scholarly journals The structure of polyisoprenes. I. The crystal structure of geranylamine hydrochloride

1945 ◽  
Vol 183 (995) ◽  
pp. 388-404 ◽  
Keyword(s):  
Crystal Structure ◽  
Nitrogen Atom ◽  
Three Dimensional ◽  
Trans Configuration ◽  
Single Bond ◽  
Interatomic Distances ◽  
X Ray ◽  
Gutta Percha ◽  
Carbon Bonds ◽  
Molecular Dimensions

An X-ray analysis employing three-dimensional Fourier syntheses has established the crystal structure and molecular dimensions of the di-isoprene derivative, geranylamine hydrochloride. The molecules, which have a trans configuration and are therefore analogous to gutta- percha, lie parallel and end to end in pairs within an ionic framework where each nitrogen atom is equidistant from four chlorine neighbours. The two isoprene units are planar and have normal interatomic distances, but are linked by a C-C bond markedly shorter than a normal single bond. This unusual bond feature is accompanied by a coplanar arrangement with the adjacent carbon bonds.

Untersuchungen an Stickstoff-Brom-Verbindungen, IV / Studies on Nitrogen-Bromine Compounds, IV

1977 ◽  
Vol 32 (12) ◽  
pp. 1416-1420 ◽  
Author(s):  
Omar Jabay ◽  
Hans Pritzkow ◽  
Jochen Jander
Keyword(s):  
Crystal Structure ◽  
Nitrogen Atom ◽  
Structure Analysis ◽  
Electron Acceptors ◽  
Molecular Structures ◽  
Hydrogen Atoms ◽  
X Ray ◽  
Crystal And Molecular Structures ◽  
Solid Nitrogen ◽  
Intermolecular Contacts

The crystal and molecular structures of N-bromobenzamide (NBB), N-bromosuccinimide (NBS), and N,N-dibromobenzenesulfonamide (NBBS) were determined by X-ray structure analysis. The nitrogen atoms in NBB and NBS have a trigonal planar coordination (sp2) and the N—Br distances lie in the same range (1.82 A, 1.84 A). The N—Br distance in NBBS, where the nitrogen atom is sp3-hybridized, is somewhat longer (1.88 A). In these structures the molecules are connected by O···H—N (NBB), O···Br—N (NBS) or N···Br—N (NBBS) intermolecular bonds forming endless chains; positivated hydrogen atoms or, in case that they are absent, positivated bromine atoms act as electron acceptors with oxygen or sp3- hybridized nitrogen atoms. These results suggest, that in solid nitrogen tribromide, the crystal structure of which cannot be determined, the nitrogen atoms will be sp3-hybridized and intermolecular contacts via N—Br···N will occur.

scholarly journals Die Kristallstruktur von PPh3Me[NbOCl4(CH3CN)] / The Crystal Structure of PPh3Me[NbOCl4(CH3CN)]

1984 ◽  
Vol 39 (1) ◽  
pp. 107-110 ◽  
Author(s):  
W. Hiller ◽  
J. Strähle ◽  
H. Prinz ◽  
K. Dehnicke
Keyword(s):  
Crystal Structure ◽  
Double Bond ◽  
Nitrogen Atom ◽  
Bond Length ◽  
Unit Cell ◽  
Trans Position ◽  
Space Group ◽  
X Ray ◽  
Oxo Ligand ◽  
Solvate Molecule

The X-ray structure of PPh3Me[NbOCl4(CH3CN)] at 210 K was solved (space group P1̄, two formula units per unit cell, a = 1173.5(5), b = 1130.1(4), c = 946.8(3) pm, α = 97.70(4), β = 93.57(3), γ = 78.62(3)°, 3688 inde­pendent reflexions, R = 0.025). The material consists of cations [P(C6H5)3CH3]⊕ and anions [NbOCl4(CH3CN)]⊖. The nitrogen atom of the acetonitrile solvate molecule is coordinated to the niobium centre in the trans-position to the oxo ligand; the NbO bond length of 169 pm corresponds to a double bond.

Formation and Structure of Cinchona Alkaloid (Bis-2,3-naphthalenediyl)orthoborate Salts

2000 ◽  
Vol 55 (11) ◽  
pp. 1083-1088 ◽  
Author(s):  
Maciej Kubicki ◽  
Teresa Borowiak ◽  
Krystyna Gawrońska ◽  
Jacek Gawroński
Keyword(s):  
Crystal Structure ◽  
Nitrogen Atom ◽  
Hydrogen Bonds ◽  
Cinchona Alkaloids ◽  
Cinchona Alkaloid ◽  
Cd Spectra ◽  
Polar Solvents ◽  
X Ray ◽  
Solvent Molecules ◽  
Additional Hydrogen

A series of (bis-2,3-naphthalenediyl)orthoborate salts of Cinchona alkaloids has been synthesized and characterized. The interactions between ions in the salts have been studied by means of circular dichroism spectroscopy and X-ray crystal structure determination. The CD spectra of the dihydroquinidine salt show that in non-polar solvents it exists as a tightly held ion pair. The crystal structure of the cinchonidine salt proves the existence of ions in the solid state. The protonation takes place at the quinuclidine nitrogen atom. The hydrogen bonds connect cation and anion into one recognizable unit. Additional hydrogen bonds (with hydroxy group as a hydrogen donor and quinoline nitrogen atom as an acceptor) form infinite chains of cations along the [001] direction. There are cavities in the crystal structure that are partially filled by solvent molecules (acetone).

Structure Investigations of Agonists of the Natural Neurotransmitter Acetylcholine VI [1]. X-Ray Structure Analysis of Trimethyl[2-(propionyloxy)ethyl]- ammonium-iodide (O-Propionylcholine-iodide)

1986 ◽  
Vol 41 (5-6) ◽  
pp. 641-646 ◽  
Author(s):  
Alfred Gieren ◽  
Michail Kokkinidis
Keyword(s):  
Crystal Structure ◽  
Nitrogen Atom ◽  
Formula Unit ◽  
Ammonium Iodide ◽  
Asymmetric Unit ◽  
Torsion Angles ◽  
Methyl Group ◽  
X Ray ◽  
Acetylcholine Chloride ◽  
Structure Investigations

The title compound (1) crystallizes in the orthorhombic, noncentrosymmetric space group Pna21 with a = 10.241(11), b = 12.903(12), c = 9.312(9) Å and with one formula unit per asymmetric unit. The stereochemically comparable torsion angles of the cation of 1 and of acetylcholine chloride are analogous. In the crystal structure the trimethylammonio methyl group is surrounded by three anions in the first coordination sphere. The geometry of a triangle formed by one of these counterions which occupies a special face of the N+C4 tetrahedron of the (CH3)3N+-CH2-R moiety, the nitrogen atom of the ammonium group and the oxygen atom of the carbonyl group is typical for nicotinic agonists.

Notizen: Kristallstruktur eines mesomeren Organozinnradikals1 / Crystal Structure of a Mesomeric Organo Tin Radical

1977 ◽  
Vol 32 (3) ◽  
pp. 355-356 ◽  
Author(s):  
Wolfgang Uber ◽  
Hartmut B. Stegmann ◽  
Klaus Scheeffleb ◽  
Joachim Strähle
Keyword(s):  
Crystal Structure ◽  
Nitrogen Atom ◽  
Additional Contribution ◽  
Coupling Constant ◽  
Tin Compounds ◽  
X Ray ◽  
X Ray Crystallography

o-Aminophenols react with organo tin compounds forming stable mesomeric complexes. The structure of one compound was determined by X-ray crystallography. The tin atom is chelated by two oxygen and one nitrogen atom. The nitrogen atom and the associated C and Sn atoms are in a plane and therefore the ESR tin coupling constant has an additional contribution by a π-σ-interaction through the N—Sn bond.

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