Force Constants of Tetrahedral Molecules

1958 ◽  
Vol 28 (3) ◽  
pp. 514-515 ◽  
Author(s):  
C. W. F. T. Pistorius
Keyword(s):  
Force Constants ◽  
Tetrahedral Molecules

Tetraquecksilbermethane, II [1]Tetrakis(halogenoquecksilber)-methane C(HgX)4 (X = F, Cl, Br und I): Synthesen und Schwingungsspektren / Tetramercurimethanes, II [1]Tetrakis(halomercuri)methanes C(HgX)4 (X = F, Cl, Br und I): Syntheses and Vibrational Spectra

1979 ◽  
Vol 34 (3) ◽  
pp. 390-395 ◽  
Author(s):  
Dietrich Breitinger ◽  
Wilfred Morell ◽  
Knut Grabetz
Keyword(s):  
Vibrational Spectra ◽  
Hydrofluoric Acid ◽  
Force Constants ◽  
The Other ◽  
Other Hand ◽  
Highly Sensitive ◽  
Symmetry Species ◽  
Complete Series ◽  
Tetrahedral Molecules

Abstract The complete series of tetrakis(halomercuri)methanes C(HgX)4 (X = F, Cl, Br and I) was prepared by metathesis of tetrakis(acetoxymercuri)methane and aqueous hydrofluoric acid and solutions of halides (Cl-, Br-, and I-), respectively. All compounds are insoluble in most common solvents, but partly soluble in dimethylsulfoxide. Complete vibrational spectra indicate more or less ideally tetrahedral molecules C(HgX)4 in all cases. The originally triply degenerate valence vibrations of the CHg4 entities and the force constants for the C-Hg bonds show distinct correlations with the electronegativities of the halides X. On the other hand the totally symmetrical valence vibrations of CHg4 were found to be highly sensitive to variations in X, mainly due to coupling with the valence vibrations of the Hg-X-groups of the same symmetry species. Some analogies in the vibrational behaviour of the CHg4 fragments and of the isosteric NHg4 core in tetramercurioammonium complexes were observed and discussed.

Calculation of internal valence force constants for XY4 (Td) tetrahedral molecules

1992 ◽  
Vol 271 (3) ◽  
pp. 237-249 ◽  
Author(s):  
M. Fernández Gómez ◽  
J.J. López González ◽  
N. Rajamanickam ◽  
E. Martínez-Torres
Keyword(s):  
Force Constants ◽  
Valence Force ◽  
Tetrahedral Molecules

Intramolecular Force Field of some Tetrahedral Molecules and Ions

1972 ◽  
Vol 27 (8-9) ◽  
pp. 1213-1216 ◽  
Author(s):  
B. B. Srivastava ◽  
A. K. Dublish ◽  
A. N. Pandey ◽  
A. K. Mithal
Keyword(s):  
Force Field ◽  
Relative Stability ◽  
Force Constants ◽  
Kinetic Constants ◽  
Lennard Jones Potential ◽  
Jones Potential ◽  
Valence Force ◽  
Valence Force Field ◽  
Lennard Jones ◽  
Tetrahedral Molecules

Abstract The orbital valence force field (OVFF), and the Urey-Bradley force field (UBFF) have been employed to calculate the force constants for six molecules and ions (AlCl4-, AlBr4-, AlI4-, Til4- , Os16O4 , and Os18O4). The results have been discussed in the light of the relative stability of the bonds. The applicability of the Lennard-Jones potential is also examined. The kinetic constants have been computed and the results have been correlated with the corresponding force constants.

ORBITAL FOLLOWING IN TETRAHEDRAL MOLECULES

1959 ◽  
Vol 37 (9) ◽  
pp. 1002-1007 ◽  
Author(s):  
Lesser Blum ◽  
Norah V. Cohan
Keyword(s):  
Force Constants ◽  
Tetrahedral Molecules

On the basis of Heath and Linnett's formulas, the "orbital following" force constants of NH3- and [Formula: see text]-like molecules are calculated. The anomalous results are interpreted as a consequence of orbital deformation during the vibratory movement.

Pseudo-exact Force Constants for Tetramethyls of Group IVA Metals and Molecular Force Fields for Some Tetrahedral Molecules or Ions

1977 ◽  
Vol 32 (1) ◽  
pp. 76-78 ◽  
Author(s):  
A. K. Dublish ◽  
B. B. Srivastava ◽  
D. K. Sharma ◽  
U. P. Verma ◽  
A. N. Pandey
Keyword(s):  
Ir Spectra ◽  
Approximation Method ◽  
Force Fields ◽  
Vapour Phase ◽  
Force Constants ◽  
Approximation Methods ◽  
Mass Model ◽  
Molecular Force ◽  
Group Iva ◽  
Tetrahedral Molecules

Abstract Recently reported Coriolis constants of tetrahedral tetramethyls of group IVA metals from the vapour phase IR spectra have been used to determine the pseudo-exact force constants with the aid of the point mass model. The symmetrized force constants for tetramethyls of group IVA and some tetrahedral molecules and ions have also been computed following thhe L-F approximation method. The results are compared with exact or pseudo-exact force constants and with those force constants obtained from different approximation methods. The validity of the method has been tested.

Force constants and chemical hardnesses

1997 ◽  
Vol 92 (3) ◽  
pp. 353-358 ◽  
Author(s):  
S. ARULMOZHIRAJA ◽  
P. KOLANDAIVEL
Keyword(s):  
Force Constants

Note on the Force Constants for the Borohydride Ion

1962 ◽  
Vol 32 (3_4) ◽  
pp. 219-221 ◽  
Author(s):  
N. Brearley ◽  
S. Sundaram
Keyword(s):  
Force Constants
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