The valence force constants and bond orders of thionyl halides by the effective nuclear charge method

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With the use of the effective nuclear charge method, the potential constants of the pyramidal xy2z type of molecules have been evaluated for the first time. A normal co-ordinate analysis has also been carried out, using F.G. matrix method, by setting the initial F matrix based on these force constants. The values obtained by incorporating the observed frequency data agree very well with those arrived at from nuclear charge method. This proves the elegancy of the nuclear charge method in predicting the force constants.