35Cl NQR Spectra of SnCl4 Complexes with Methylaryl Ethers

1986 ◽  
Vol 41 (1-2) ◽  
pp. 211-214 ◽  
Author(s):  
Igor M. Lazarev ◽  
Gennadii V. Dolgushin ◽  
Valentin P. Feshin ◽  
Michail G. Voronkov
Keyword(s):  
Octahedral Structure ◽  
Trigonal Bipyramidal ◽  
Distorted Octahedral ◽  
35Cl Nqr ◽  
Bipyramidal Structure ◽  
35Cl Nqr Spectra ◽  
Oxygen Atoms

SnCl4 Complexes with methylaryl ethers and their 35Cl NQR spectra have been obtained. All these complexes, except SnCl4 · 1,2-(CH3O)2C6H4, have a trigonal-bipyramidal structure. The latter compound has an essentially distorted octahedral structure. One of the ligand oxygen atoms takes part in the formation of the SnCl4 complex with 1,3-, 1,4-(CH3O)2C6H4 and RNO2. These complexes have a trigonal-bipyramidal structure too.

Die Reaktion eines gemischten Doppelylids mit Ethylenoxid / Reaction of a Mixed Double Ylide with Ethylene Oxide

1978 ◽  
Vol 33 (5) ◽  
pp. 572-573 ◽  
Author(s):  
Hubert Schmidbaur ◽  
Peter Holl
Keyword(s):  
Ethylene Oxide ◽  
Nmr Spectra ◽  
Trigonal Bipyramidal ◽  
Bipyramidal Structure ◽  
Oxygen Atoms

Abstract Dimethyl-trimethylphosphinimino-methylene-phosphorane, (CH3)3P=N-P(CH3)2 = CH2 was found to react with ethylene oxide to form a 1:1 adduct, that was identified as 2,2-dimethyl-2-trimethylphosphinimino -1,2λ5 -oxaphospholane. According to its 1H, 13C, 31P NMR spectra it is assigned a rigid trigonal bipyramidal structure with nitrogen and oxygen atoms in axial positions.

35Cl NQR spectra and molecular structure of cyclic chlorophosphoranes

1993 ◽  
Vol 34 (3) ◽  
pp. 402-405
Author(s):  
I. A. Kyuntsel ◽  
G. B. Soifer ◽  
E. S. Kozlov ◽  
A. D. Sinitsa
Keyword(s):  
Molecular Structure ◽  
35Cl Nqr ◽  
35Cl Nqr Spectra

scholarly journals Crystal structure of 2-methyl-1H-imidazol-3-ium aquatrichlorido(oxalato-κ2O,O′)stannate(IV)

2015 ◽  
Vol 71 (5) ◽  
pp. 520-522 ◽  
Author(s):  
Mouhamadou Birame Diop ◽  
Libasse Diop ◽  
Laurent Plasseraud ◽  
Thierry Maris
Keyword(s):  
Hydrogen Bonds ◽  
Water Molecule ◽  
Three Dimensional ◽  
Free Oxygen ◽  
Coordination Environment ◽  
Dimensional Network ◽  
Oxalate Ligand ◽  
Distorted Octahedral ◽  
Distorted Octahedral Coordination Environment ◽  
Oxygen Atoms

The tin(IV) atom in the complex anion of the title salt, (C4H7N2)[Sn(C2O4)Cl3(H2O)], is in a distorted octahedral coordination environment defined by three chlorido ligands, an oxygen atom from a water molecule and two oxygen atoms from a chelating oxalate anion. The organic cation is linked through a bifurcated N—H...O hydrogen bond to the free oxygen atoms of the oxalate ligand of the complex [Sn(H2O)Cl3(C2O4)]−anion. Neighbouring stannate(IV) anions are linked through O—H...O hydrogen bonds involving the water molecule and the two non-coordinating oxalate oxygen atoms. In combination with additional N—H...Cl hydrogen bonds between cations and anions, a three-dimensional network is spanned.

scholarly journals The maximum surface area polyhedron with five vertices inscribed in the sphere {\bb S}^{2}

2021 ◽  
Vol 77 (1) ◽  
pp. 67-74
Author(s):  
Jessica Donahue ◽  
Steven Hoehner ◽  
Ben Li
Keyword(s):  
Convex Hull ◽  
Surface Area ◽  
Coordination Polyhedron ◽  
Unit Sphere ◽  
The Other ◽  
Optimal Placement ◽  
The North ◽  
Trigonal Bipyramidal ◽  
Bipyramidal Structure ◽  
North And South

This article focuses on the problem of analytically determining the optimal placement of five points on the unit sphere {\bb S}^{2} so that the surface area of the convex hull of the points is maximized. It is shown that the optimal polyhedron has a trigonal bipyramidal structure with two vertices placed at the north and south poles and the other three vertices forming an equilateral triangle inscribed in the equator. This result confirms a conjecture of Akkiraju, who conducted a numerical search for the maximizer. As an application to crystallography, the surface area discrepancy is considered as a measure of distortion between an observed coordination polyhedron and an ideal one. The main result yields a formula for the surface area discrepancy of any coordination polyhedron with five vertices.

scholarly journals The Layered Structure of Cu2(H2O)4[C4H4N2][C6H2(COO)4]·2H2O

2019 ◽  
Author(s):  
Roberto Köferstein
Keyword(s):  
Nitrogen Atom ◽  
Single Crystals ◽  
Silica Gel ◽  
Layered Structure ◽  
Water Molecules ◽  
Two Dimensional ◽  
Space Group ◽  
Distorted Octahedral ◽  
Oxygen Atoms

Triclinic single crystals of Cu2(H2O)4[C4H4N2][C6H2(COO)4]·2H2O have been grown in anaqueous silica gel. Space group P-1 (Nr. 2), a = 723.94(7) pm, b = 813.38(14) pm, c = 931.0(2) pm, α = 74.24(2)°, β = 79.24(2)°, γ = 65.451(10)°, V = 0.47819(14) nm3, Z = 1. Cu2+ is coordinated in a distorted, octahedral manner by two water molecules, three oxygen atoms ofthe pyromellitate anions and one nitrogen atom of pyrazine (Cu—O 194.1(2)–229.3(3) pm;Cu–N 202.0(2) pm). The connection of Cu2+ and [C6H2(COO)4)]4− yields infinite strands,which are linked by pyrazine molecules to form a two-dimensional coordination polymer.Thermogravimetric analysis in air showed that the dehydrated compound was stable between175 and 248 °C. Further heating yielded CuO.

35Cl NQR spectra of group 1 and silver dichloromethanesulfonates

HFI/NQI 2007 ◽  
2008 ◽  
pp. 533-539
Author(s):  
Gabriel Gillette ◽  
Gary Wulfsberg
Keyword(s):  
35Cl Nqr ◽  
Group 1 ◽  
35Cl Nqr Spectra

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.

35Cl NQR spectra of certain chlorine-containing chromium compounds

2015 ◽  
Vol 89 (3) ◽  
pp. 510-511
Author(s):  
S. I. Kuznetsov ◽  
E. V. Bryukhova ◽  
G. K. Semin
Keyword(s):  
35Cl Nqr ◽  
Chromium Compounds ◽  
35Cl Nqr Spectra

The crystal structure of Bis[2-(pyridin-2-ylamino)-4-(pyridin-2-yl)thiazole]iron(II) Bis(tetrafluoroborate) trihydrate

1984 ◽  
Vol 37 (2) ◽  
pp. 443 ◽  
Author(s):  
AT Baker ◽  
HA Goodwin ◽  
AD Rae
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Complex Cation ◽  
Monoclinic Space Group ◽  
Octahedral Structure ◽  
Space Group ◽  
X Ray ◽  
Disordered Structure ◽  
Distorted Octahedral ◽  
A Cell

The crystal structure of an iron(II) complex of 2-(pyridin-2-ylamino)-4-(pyridin-2-yl)tliazoe (paptH) has been determined by single-crystal X-ray diffractometry. [Fe(paptH)2] [BF4]2.3H2O is monoclinic, space group P21/c, with Z = 4 in a cell of dimensions a 8.968(6), b 9.038(4), c 41.15(2)�, β 94.81(2)�. The disordered structure was refined to a residual R 0.0826 for 2549 observed reflections. The ligands and anions are orientationally disordered, and the waters of crystallization are positionally disordered. Comprehensive constrained refinement, with 220 parameters for 139 atom positions, produced reliable geometry. The complex cation has a distorted octahedral structure of meridional configuration with both paptH ligands functioning as tridentates.

The Crystal Structure of [2,6-Bis(1-methyl-4-methylthio-5-thia-2,3-diazahexa-1,3-dienyl)-pyridine]dithiocyanatonickel(II), a Complex of a Potentially Pentadentate N3S2 Ligand, and a Comparison with Complexes of an N3O2 Ligand

1979 ◽  
Vol 32 (6) ◽  
pp. 1199 ◽  
Author(s):  
W Choong ◽  
NC Stephenson ◽  
MA Ali ◽  
MA Malik ◽  
DJ Phillips
Keyword(s):  
Crystal Structure ◽  
Data Structure ◽  
Pyridine Ring ◽  
Structure Refinement ◽  
Three Dimensional ◽  
Octahedral Structure ◽  
Potential Donor ◽  
X Ray ◽  
Distorted Octahedral ◽  
R Value

The crystal structure of Ni(dapsm)(NCS)2 [dapsm is 2,6-bis(1-methyl-4-methylthio-5-thia-2,3-diazahexa-1,3-dienyl)pyridinel has been determined from three-dimensional single-crystal diffractometer X-ray data. Structure refinement was carried out by least-squares methods to a final R value of 0.059. The ligand dapsm is a potential N3S2 pentadentate, but it coordinates as a tetradentate, giving a planar N3S donor grouping. Rotation occurs about an N-N bond in dapsm, moving a potential donor sulfur atom away from the nickel(II) ion. The pyridine ring of the ligand, and the N3S donor grouping, are approximately coplanar. Two thiocyanate groups are coordinated to the nickel, giving a distorted octahedral structure. The structure and electronic spectrum of Ni(dapsm)- (NCS)2 are compared with those for seven-coordinate complexes with the related N3O2 ligand, 2,6-diacetylpyridine bissemicarbazone.

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