SPCl3







 









Chlorine


Nuclear Quadrupole Coupling Constants


in Thiophosphoryl Chloride


 








 


 




 
Calculation was made here of the chlorine nqcc's in thiophosphoryl chloride on the equilibrium and average molecular structures derived by Firth and Davis [1].  These are given in Table 1 and 2.  Structure parameters are compared in Table 3, atomic coordinates for the equilibrium structure are given in Table 4.
 
 
Coordinate Systems
Xuu is the component of the nqcc tensor along the threefold symmetry axis.  Corresponding to the atomic coordinates given below in Table 4, Xvv and Xww are the components along the v- and w- axes for the Cl atom in the uv-plane.
The subscripts x,y,z refer to the principal axes of the nqcc tensor.  The nqcc y-axis is chosen coincident with the w-axis.  Ø (degrees) is the angle between its subscripted parameters.  ETA = (Xxx - Xyy)/Xzz.
 

 








   







Table 1.  Chlorine nqcc's in SPCl3 (MHz).  Calculation was made on the re structure [1].
   




Calc.
Expt.

 



35Cl Xuu 14.71
Xvv - 43.31
  Xww 28.60
Xuv 35.69
 
Xxx 31.69
Xyy 28.60
Xzz - 60.29
ETA - 0.051
Øz,u 64.55
Øu,PCl 63.65
Øz,PCl   0.90
 
37Cl Xuu 11.59
Xvv - 34.14
Xww 22.54
Xuv 28.12
 


 







 
The pyramid formed by the z-principal axes of the three Cl nqcc tensors is somewhat 'flatter' than the molecular pyramid.  This is typical of the pyramidal trichlorides.
 
 
   







Table 2.  Chlorine nqcc's in SPCl3 (MHz).  Calculation was made on the rz structure [1].
   




Calc.
Expt.

 



35Cl Xuu 14.83
Xvv - 43.63
  Xww 28.80
Xuv 35.89
 
37Cl Xuu 11.69
Xvv - 34.38
Xww 22.70
Xuv 28.28
 
 
 
 
Table 3. Molecular structure parameters (Å and degrees).
re [1] rz [1]
SP 1.8805 1.8835
PCl 2.0042 2.0093
SPCl 116.35 116.35
 
Table 3. Atomic coordinates, re
(More figures are shown than are significant.)
 
  u (Å)   v (Å)   w (Å)
Cl - 0.703204 1.795994 0.0
Cl - 0.703204 - 0.897997 ± 1.555376
P 0.186304 0.0 0.0
S 2.066804 0.0 0.0
 
 

[1] S.Firth and R.W.Davis, J.Mol.Spectrosc. 179,32(1996).
 
 
NCl3 PCl3 CHCl3 SiHCl3
AsCl3 OPCl3 CFCl3 CH3CCl3

 








 








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Last Modified 3 June 2003