Calculated electronic transition energies and oscillator strengths of BODIPY-OO, BODIPY-OO–Ag⁺, and BODIPY-OO–Hg²⁺.

Compound	λ max (nm)	Band assignment	Excitation energy (eV)	Oscillator strength
BODIPY-OO	442	H−0 → L+0 (49%)	2.80	1.21
		H−1 → L+1 (49%)
BODIPY-OO–Ag+	440	H−0 → L+1 (57%)	2.82	1.08
		H−1 → L+0 (41%)
BODIPY-OO–Hg2+	456	H−0 → L+1 (49%)	2.72	1.17
		H−1 → L+0 (49%)