The distance between the atoms C5eC6
was calculated as in the range of 1.378 Å and 1.379 Å by using DFT/
B3LYP with two different basis sets respectively. All the CeH bonds
were shown almost similar bond length values in both DFT and
DFTþþ methods. The S1eC6 bond length calculated at 1.787 Å and
1.788 Å by both DFT and DFTþþ methods is in good agreement with
the literature data 1.740 Å