Molekülstrukturen von Phosphorverbindungen, IV / Molecular Structures of Phosphorus Compounds, IV

1975 ◽  
Vol 30 (7-8) ◽  
pp. 506-512 ◽  
Author(s):  
H. Oberhammer ◽  
J. Grobe
Keyword(s):  
Electron Diffraction ◽  
Geometric Parameters ◽  
Molecular Structures ◽  
Trigonal Bipyramid ◽  
Phosphorus Compounds ◽  
Equatorial Position ◽  
Mean Square ◽  
Potential Barriers ◽  
Distorted Trigonal Bipyramid ◽  
The Mean

The molecular structures of the two trifluoromethyl phosphoranes (CF3)2PCl3 and (CF3)3PCl2 have been determined by electron diffraction of gases. The structure of (CF3)2PCl3 was found to be a regular trigonal bipyramid with both CF3 groups in axial positions (D3h symmetry) and the fluorine atoms staggered to the equatorial chlorine atoms. The following geometric parameters (ra-values) were obtained: r(C-F) = 1.331(2) Å, r(P-C) = 1.950(II) Å, r(P-Cl) = 2.036(2) Å and ⦓ FCF = 108.3°(0.4). (CF3)3PCl2 possesses the structure of a distorted trigonal bipyramid with two CF3 groups in axial and one in equatorial position. Again the fluorine atoms of the axial CF3 groups are staggered to the equatorial atoms. The ra-values for the geometric parameters are: r(C-F)= 1.329(2) Å, r(P-C)eq= 1.938(31) Å, r(P-C)ax = 1.946(14) Å, r(P-Cl) = 2.053(6) Å, ⦓ FCF = 108.5°(0.3), ⦓ ClPCl = 133.0°(1.7) and ⦓ CaxPCeq = 95.5°(1.9). The average P-C bond length was found to be r(P-C)av = 1.943(5) A. The results for the mean square amplitudes are given in the article. It was shown that in both molecules the torsional amplitudes of the CF3 groups around the P-C bond directions are small, indicating high potential barriers to internal rotation.

Die Molekülstruktur des N-Chlorsdiwefeloxiddifluoridimids ClNSOF2 / The Molecular Structure of ClNSOF2

1974 ◽  
Vol 29 (6) ◽  
pp. 901-904 ◽  
Author(s):  
O. Oberhammer ◽  
O. Glemser ◽  
H. Klüver
Keyword(s):  
Molecular Structure ◽  
Electron Diffraction ◽  
Geometric Parameters ◽  
Mean Square ◽  
The Mean

The molecular structure of ClNSOF2 was determined by electron diffraction of gases. The following geometric parameters were obtained:Cl-N=1.715(5), S=N=1.484(7), S=O=1.394(3), S-F=1.548(3) Å, ∢ ClNS=114.7 (8), ∢ FSF=92.6(.8), ∢ NSF=111.8(.9) ∢ NSO=117.4 (3.1) and ∢ OSF=108.6 (.8)°. The results for the mean square amplitudes of vibration are given in the paper and an attempt is made to explain differences in corresponding parameters of some related molecules.

Molekūlstrukturen von Phoshorverbindungen / Molecular Structure of Phosphorus Compounds. 1. Trimethylphosphate

1973 ◽  
Vol 28 (7) ◽  
pp. 1140-1144
Author(s):  
I. Trimethylphosphat ◽  
H. Oberhammer
Keyword(s):  
Molecular Structure ◽  
Electron Diffraction ◽  
Vapour Phase ◽  
Geometric Parameters ◽  
Phosphorus Compounds ◽  
Mean Square ◽  
Scattering Intensity ◽  
Rotational Isomers ◽  
Best Fit

The molecular structure of Trimethylphosphate O = P(OCH3)3 has been determined in the vapour phase by electron diffraction. The best fit of the experimental scattering intensity was obtained by assuming two rotational isomers with C3-symmetry occuring in a ratio of approximately 3:1. The geometric parameters and mean square amplitudes are given in the article.

scholarly journals Notizen:The G eneralised Mean Square Amplitudes of Vibration for Substituted Ethylenes Vinylidene Halides and their Deuterates

1971 ◽  
Vol 26 (4) ◽  
pp. 778-780
Author(s):  
S. Jeyapandian
Keyword(s):  
Electron Diffraction ◽  
Diffraction Data ◽  
Spectroscopic Data ◽  
Electron Diffraction Data ◽  
Mean Square ◽  
Type C ◽  
The Mean

Abstract For six vinylidene halides the generalised mean square amplitudes of displacements parallel and perpendicular to the bond for both bonded and non-bonded atom distances are cal­culated from spectroscopic data using the method of Morino and Hirato. The results are discussed and the mean amplitu­des of these molecules (H2C=CX2) are compared with those from electron diffraction data for the similar molecules of the type C2X4.

scholarly journals Die Kristall- und Molekülstrukturen der Verbindungen [Cl4–xSn{Co(CO)4}x] mit x = 1,2 und 3 / The Crystal and Molecular Structures of the Compounds [Cl4-xSn{Co(CO)4}x] with x = 1,2 and 3

1991 ◽  
Vol 46 (2) ◽  
pp. 187-191 ◽  
Author(s):  
Peter Klüfers
Keyword(s):  
Crystal Structures ◽  
Molecular Structures ◽  
Trigonal Bipyramid ◽  
X Ray ◽  
X Ray Crystallography ◽  
Crystal And Molecular Structures ◽  
Distorted Trigonal Bipyramid

The crystal structures of the compounds [Cl3SnCo(CO)4] 1, [Cl2Sn{Co(CO)4}2]2, and [ClSn{Co(CO)4}3]3, have been determined by X-ray crystallography. Sn is co-ordinated tetrahedrally by Cl- and Co-substituents, the co-ordination polyhedron of Co is a distorted trigonal bipyramid. The Sn -Cl- and the Sn-Co-distances both increase from 1 to 3 (Sn -Co: 247.7 in 1, 253.2 in 2, and 260.6 pm in 3).

Synthesis, Spectroscopic Characterization and Crystal and Molecular Structures of {Ph4P[(Se04 )(SnPh3 )(SnPh3X)]}n (X = Cl, Br)

2001 ◽  
Vol 56 (3) ◽  
pp. 233-238 ◽  
Author(s):  
C. A. Diop ◽  
L. Diop ◽  
U. Russo ◽  
A. Sánchez-Díaz ◽  
A. Castiñeiras
Keyword(s):  
Coordination Polyhedron ◽  
Spectroscopic Characterization ◽  
Molecular Structures ◽  
Trigonal Bipyramid ◽  
Side Chain ◽  
X Ray ◽  
Crystal And Molecular Structures ◽  
Distorted Trigonal Bipyramid ◽  
Nmr Techniques ◽  
Polymeric Structures

Abstract The reactions of bis[triphenyltin(IV)] selenate monohydrate [(Ph3Sn)2O4Se · H2O ] with tetraphenylphosphonium halides Ph4PX (X = Cl, Br) led to the formation of 1:1 complexes of formula {Ph4P[(SeO4)(SnPh3 (SnPh3X)]k [X = Br (I) or Cl (II)], which were characterized by infrared, Mössbauer and H, 13C and Sn 119Sn NMR techniques and by X-ray diffractometry. The complexes have polymeric structures in which the [SnPh3]+ units alternate with bridging [SeO4]2- units, each of which also bears an SnPh3X side chain. In both the [SnPh3]+ and the [SnPh3X] units the coordination polyhedron of the tin atom is a distorted trigonal bipyramid.

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