Density functional theory (DFT) calculations were carried out
with B3LYP-6-31G and B3LYP/LanL2DZ basis set using Gaussian
03 program package to confirm the UV–visible and fluorescence
changes upon the addition of F-anions. The TD-DFT calculations
on the optimized geometries of DN & DN.F was performed using
the above basis set in order to obtained the electronic behavior and
oscillator strength for the corresponding transitions