Experimental and Theoretical Studies on the Structure and Photoluminescent Properties of New Mononuclear and Homodinuclear Europium(III) β-Diketonate Complexes

Table 5

Comparison of theoretical (for complex 1 and complex 2) and experimental values (for similar Eu³⁺ complexes reported in the literature) of the intensity parameters (), radiative () and nonradiative () emission rates, and quantum yields ().

Compound	Intensity parameters (10^−20 cm^2)			(s^−1)	(s^−1)	τ (μs)	η (%)	References
	Ω2	Ω4	Ω6
Complex 1	20.41	7.87	0.35	785.65	642.93	700	54.05	—
Complex 2 (Eu1)	20.40	7.90	0.26	785.73	642.84	700	53.29	—
Complex 2 (Eu1a)	20.40	7.90	0.40	785.84	642.73	700	52.87	—
Eu(btfa(phenNO)	18.6	—	—	830	650	670	66	[15]
Eu(btfa(4,4′-bipy) (EtOH)	28.8	6.7	—	1033	1189	450	46.5	[16]
Eu(btfa(phen)	—	—	—	580	569	210	50	[17]
Eu(tta(phen)	—	—	—	436	993	700	31	[17]
Eu(NTA(phen)	—	—	—	600	900	662	40	[17]

btfa = 4,4,4-trifluoro-1-phenyl-1,3-butanedionate; tta = 2-thenoyltrifluoroacetonate; NTA = 1-(2-naphthoyl)-3,3,3-trifluroacetonate; phen = phenanthroline; phenNO = 1,10-phenanthroline-N-oxide; 4,4′-bipy = 4,4′-bipyridine.