Unusually large gas-solid structure differences: a crystallographic study of HCN-BF3 [hydrogen cyanide-boron trifluoride]

1993 ◽  
Vol 115 (24) ◽  
pp. 11622-11623 ◽  
Author(s):  
W. A. Burns ◽  
K. R. Leopold
Keyword(s):  
Hydrogen Cyanide ◽  
Boron Trifluoride ◽  
Solid Structure ◽  
Crystallographic Study

Microwave spectra and structure of hydrogen cyanide-boron trifluoride: an almost weakly bound complex

1993 ◽  
Vol 97 (41) ◽  
pp. 10630-10637 ◽  
Author(s):  
S. W. Reeve ◽  
W. A. Burns ◽  
F. J. Lovas ◽  
R. D. Suenram ◽  
K. R. Leopold
Keyword(s):  
Hydrogen Cyanide ◽  
Boron Trifluoride ◽  
Weakly Bound ◽  
Microwave Spectra

scholarly journals The dielectric coefficients of gases III—Allene, allylene, butanes, butylenes, cyanogen, and hydrogen cyanide—IV— Fluorides of boron, nitrogen, and carbon

1936 ◽  
Vol 156 (887) ◽  
pp. 130-143 ◽  
Keyword(s):  
Hydrogen Cyanide ◽  
Boron Trifluoride ◽  
The Other ◽  
Raw Material ◽  
Nitrogen Trifluoride ◽  
Carbon Tetrafluoride ◽  
Dielectric Coefficient ◽  
The Stability ◽  
Boron Nitrogen

Measurements of dielectric coefficient similar to those recorded in Parts I and II have now been made for the gases allene CH 2 = C = CH 2 , CH 3 —C≡CH, n - and iso -butane, α-, β-, and iso -butylene, cyanogen, hydrogen cyanide, boron trifluoride, nitrogen trifluoride, and carbon tetrafluoride, using the same apparatus as before. Owing to the stability and the ease of working with parallel condensor described in Part II, this was employed exclusively, the condeser G 4 being used to contain the gases. Of these, allylene, iso -butylene, and hydrogen cyanide have appreciable moments, while α-butylene, nitrogen trifluoride, and possibly allene appear to be very slightly polar. The other gases are electrically neutral. β-butylene is of interest since it affords a rather rare example of a gas exhibiting cis-trans isomerism. Unfortunately, the raw material required for making the cis form could not be obtained while the experiments were in progress, so that the measurements have had to be deferred.

Hydrogen Cyanide Polymers from the Impact of Comet P/Shoemaker-Levy 9 on Jupiter

1997 ◽  
Vol 161 ◽  
pp. 179-187
Author(s):  
Clifford N. Matthews ◽  
Rose A. Pesce-Rodriguez ◽  
Shirley A. Liebman
Keyword(s):  
Amino Acids ◽  
Solar System ◽  
Hydrogen Cyanide ◽  
Nitrogen Heterocycles ◽  
Laboratory Studies ◽  
Heterogeneous Solids ◽  
The Many ◽  
Comet Halley ◽  
The Impact ◽  
By Products

AbstractHydrogen cyanide polymers – heterogeneous solids ranging in color from yellow to orange to brown to black – may be among the organic macromolecules most readily formed within the Solar System. The non-volatile black crust of comet Halley, for example, as well as the extensive orangebrown streaks in the atmosphere of Jupiter, might consist largely of such polymers synthesized from HCN formed by photolysis of methane and ammonia, the color observed depending on the concentration of HCN involved. Laboratory studies of these ubiquitous compounds point to the presence of polyamidine structures synthesized directly from hydrogen cyanide. These would be converted by water to polypeptides which can be further hydrolyzed to α-amino acids. Black polymers and multimers with conjugated ladder structures derived from HCN could also be formed and might well be the source of the many nitrogen heterocycles, adenine included, observed after pyrolysis. The dark brown color arising from the impacts of comet P/Shoemaker-Levy 9 on Jupiter might therefore be mainly caused by the presence of HCN polymers, whether originally present, deposited by the impactor or synthesized directly from HCN. Spectroscopic detection of these predicted macromolecules and their hydrolytic and pyrolytic by-products would strengthen significantly the hypothesis that cyanide polymerization is a preferred pathway for prebiotic and extraterrestrial chemistry.

Polymorphic phase transition of a membrane protein - analysis of continuous diffuse electron diffraction intensity

1986 ◽  
Vol 44 ◽  
pp. 166-167
Author(s):  
Douglas L. Dorset ◽  
Andrew K. Massalski
Keyword(s):  
Molecular Sieve ◽  
Three Dimensional ◽  
Pore Geometry ◽  
Two Dimensional ◽  
Diffraction Intensity ◽  
Polymorphic Phase Transition ◽  
E Coli ◽  
Crystallographic Study ◽  
Hexagonal Form ◽  
Polymorphic Forms

Matrix porin, the ompF gene product of E. coli, has been the object of a electron crystallographic study of its pore geometry in an attempt to understand its function as a membrane molecular sieve. Three polymorphic forms have been found for two-dimensional crystals reconstituted in phospholipid, two hexagonal forms with different lipid content and an orthorhombic form coexisting with and similar to the hexagonal form found after lipid loss. In projection these have been shown to retain the same three-fold pore triplet geometry and analyses of three-dimensional data reveal that the small hexagonal and orthorhombic polymorphs have similar structure as well as unit cell spacings.

Rotational spectrum and properties of a complex of hydrogen cyanide and chlorine monofluoride

1996 ◽  
Vol 88 (3) ◽  
pp. 673-682 ◽  
Author(s):  
K. HINDS ◽  
A.C. LEGON ◽  
J.H. HOLLOWAY
Keyword(s):  
Hydrogen Cyanide ◽  
Rotational Spectrum

A Crystallographic Study of Bis[S-benzyl-5-bromo-2-oxoindolin-3-ylidenemethanehydrazonthioate] Disulfide Solvated with Dimethylsulfoxide

2012 ◽  
Vol 9 (2) ◽  
pp. 87
Author(s):  
Mohd Abdul Fatah Abdul Manan ◽  
M. Ibrahim M. Tahir ◽  
Karen A. Crouse ◽  
Fiona N.-F. How ◽  
David J. Watkin
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Solvent Molecule ◽  
Site Occupancy ◽  
Unit Cell Parameters ◽  
Intermolecular Hydrogen Bonds ◽  
Triclinic Space Group ◽  
Cell Parameters ◽  
Crystallographic Study ◽  
Thiol Form

The crystal structure of the title compound has been determined. The compound crystallized in the triclinic space group P -1, Z = 2, V = 1839 .42( 18) A3 and unit cell parameters a= 11. 0460( 6) A, b = 13 .3180(7) A, c=13. 7321 (8) A, a = 80.659(3 )0, b = 69 .800(3 )0 and g = 77 .007 (2)0 with one disordered dimethylsulfoxide solvent molecule with the sulfur and oxygen atoms are distributed over two sites; S101/S102 [site occupancy factors: 0.6035/0.3965] and 0130/0131 [site occupancy factor 0.3965/0.6035]. The C22-S2 l and C 19-S20 bond distances of 1. 779(7) A and 1. 788(8) A indicate that both of the molecules are connected by the disulfide bond [S20-S21 2.055(2) A] in its thiol form. The crystal structure reveals that both of the 5-bromoisatin moieties are trans with respect to the [S21-S20 and CI 9-Nl 8] and [S20-S21 and C22-N23] bonds whereas the benzyl group from the dithiocarbazate are in the cis configuration with respect to [S21-S20 and C19-S44] and [S20-S21 and C22-S36] bonds. The crystal structure is further stabilized by intermolecular hydrogen bonds of N9-H35···O16 formed between the two molecules and N28-H281 ···O130, N28-H281 ···O131 and C4 l-H4 l l ···O 131 with the solvent molecule.

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