Computed λ_max, excitation energy (E_x), oscillator strength (f) and assignment of IDSTR and IDST1–IDST7 molecules in CHCl₃ solvent.

Molecules	Exp. λmax (nm)	Computed λmax (nm)	E x (eV)	f	Assignment
IDSTR	∼728	712	1.74	2.58	H–L (+98%)
IDST1	—	732	1.69	2.57	H–L (+99%)
IDST2	—	753	1.65	2.50	H–L (+98%)
IDST3	—	770	1.61	2.42	H–L (+97%)
IDST4	—	724	1.71	2.78	H–L (+99%)
IDST5	—	717	1.73	2.81	H–L (+99%)
IDST6	—	731	1.70	2.79	H–L (+98%)
IDST7	—	723	1.71	2.71	H–L (+98%)