Table 7. λ_max, E_x, f, and Assignment of DF-R and Studied Molecules in Solvent (Chloroform) Medium.

molecules	exp. λmax (nm)	calculated λmax (nm)	excitation energies Ex (eV)	oscillator strength (f)	assignment
DF-R	671	651	1.90	3.32	H–L (+96%)
DF-M1		1006	1.23	2.24	H–L (+99%)
DF-M2		1004	1.23	2.78	H-L (+99%)
DF-M3		841	1.47	2.84	H–L (+97%)
DF-M4		792	1.56	3.82	H–L (+99%)
DF-M5		771	1.60	3.39	H–L (+97%)
DF-M6		745	1.66	3.74	H–L (+98%)