Table 5.

The excitation energy (E), the absorption wavelength (λ) and the oscillator force (f) of 2BT compound.

Gas phase				Water
E (eV)	λ (nm)	f (a.u)	Major contribution	E (eV)	λ (nm)	f (a.u)	Major contribution (%)
3.90	318	0.0694	H→L (88%)	3.81	325	0.1039	H→L (91%)
4.41	281	0.2919	H-1→L (81%)	4.31	287	0.3979	H-1→L (87%)
4.72	262	0.0000	H-2→L (96%)	4.88	254	0.0000	H-3→L (96%)

H=HOMO; L = LUMO; L + 1 =LUMO+1; etc.