Boron













Calibration of the






B1LYP/6-31G(df,p)






model
















This is the recommended model, calibration statistics for which are shown below.  
 



Calibration was made by linear regression analysis of calculated electric field gradients vs experimental nuclear quadrupole coupling constants.  Calculation of the field gradients was made on the experimental structures of the following molecules:





 
BF HBF+ HBS
FBO ClBO BH3CO
FBS BH2NH2 BH3NH3
CH3BS CH3BF2
  



 
Figure 1.  Calculated efg's vs experimental nqcc's.   PDF
 
 



11B  B1LYP/6-31G(df,p)


 





Number of Points
33




Correlation Coefficient
0.99983




Residual Standard Deviation
0.046 MHz (2.1 %)




Slope, eQeff/h
9.599(32) MHz/a.u.




Qeff 40.85(13) mb




Q
40.59(10) mb [1]








 



 
10B  B1LYP/6-31G(df,p)
 


Number of Points
24 *




Correlation Coefficient
0.99983




Residual Standard Deviation
0.102 MHz (2.1 %)




Slope, eQeff/h
19.906(78) MHz/a.u.




Qeff 84.72(33) mb




Q
84.59(24) mb [1]


 
* No experimental coupling constants for FBS, BH3NH3, CH3BF2.
 



 






Reference






[1] P.Pyykkö, Z.Naturforsch 47a,189(1992).


 
"Prediction of 11B Quadrupole Coupling Constants in Molecules" W.C.Bailey, J.Mol.Spectrosc. 185,403(1997).
 
M.Palmer, Z.Naturforsch. 45a,357(1990).



 






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Last modified 26 Oct 2008