Centrosymmetric Binuclear Boron Compounds Derived from Dithiooxamides: Synthesis, Characterization, and Their Photophysical Properties

Table 2

Photophysical data of compounds in THF.

Comp	λabs (nm)	ε ∗ 10^4 (M ^−1·cm^−1)	Eg (eV)	λext (nm)	λem (nm)	∆ν (cm^−1)	ΦF (%)
1	412	4.3	2.87	402	570	6728	5.6
2	436	5.6	2.75	426	465	1430	4.07
3	407	4.2	2.67	397	468	3203	14.3
4	428	5.1	2.80	418	509	3718	2.89

λ_abs: absorption (maximum); ε: molar extinction coefficients (for two samples measured three times, and then an average of these data was made); ε ∗ 10⁴ = molar extinction coefficients multiplied to 10⁴; Eg: optical band gaps; λ_ext: excitation; λ_em: emission (maximum), correspond to those used for calculation of quantum yield; ∆ν: Stoke's shift; Φ_F: fluorescence quantum yield.