Photophysical Parameters, Excitation Energy Transfer, and Photoreactivity of 1,4-Bis(5-phenyl-2-oxazolyl)benzene (POPOP) Laser Dye

Table 1

Absorption and fluorescence properties of POPOP in different solvents.

Solvent	𝜆abs (nm)	𝜆𝑓 (nm)	ε ×10^4 mol^−1 cm^−1 dm^3	𝑓	𝑘𝑟×10^8 s^−1	𝜙𝑓	𝜏𝑓 (ns)	𝑘isc×10^8	𝜎𝑎 ×10^−16 cm^2	𝜎𝑒×10^−16 cm^2
n-Heptane	362	416	5.65	1.00	9.79	0.76	0.78	3.02	1.34	2.96
Carbon tetra chloride	370	416	4.89	0.86	8.90	0.74	0.83	3.02	1.16	2.74
Benzene	365	411	5.73	1.02	11.48	0.74	0.65	3.88	1.36	2.56
Toluene	368	418	4.98	0.90	9.95	0.81	0.81	2.29	1.18	2.81
Diethyl ether	362	411	5.12	0.93	8.67	0.73	0.84	3.15	1.22	2.88
Methyl isobutyl ketone	365	418	4.81	0.80	7.93	0.68	0.86	3.63	1.14	2.46
Amyl alcohol	365	424	4.33	0.79	7.95	0.85	1.07	1.36	1.03	2.58
Cyclohexane	363	409	4.48	0.80	8.31	0.76	0.92	2.53	1.06	2.56
Acetone	362	415	5.17	0.93	8.78	0.69	0.78	3.88	1.23	2.88
Ethanol	363	424	4.92	0.97	9.15	0.75	0.82	2.98	1.17	3.03
Methanol	361	424	4.83	0.89	8.09	0.75	0.93	2.58	1.15	2.82
Diethyl formamide	368	425	5.00	0.95	9.62	0.77	0.80	2.83	1.19	2.89
Ethylene glycol	367	439	3.25	0.57	5.82	0.92	1.58	0.47	0.77	2.1
Propylene carbonate	365	430	4.87	0.94	9.58	0.82	0.85	2.10	1.16	3.12