Synthesis and Photoluminescent Property of a Phenyl Bridged Biscorrole Gallium Complex†

doi:10.7503/cjcu20140418

Abstract

Abstract:

An m-phenyl bridged biscorrole 1 and its gallium complex 2 were synthesized and characterized by UV-Vis, ¹H NMR, ¹⁹F NMR and MS. The photoluminescent properties of them were investigated using steady state and time-resolved fluorescence spectroscopy. Fluorescence quantum yield/life time of compounds 1 and 2 are 0.142/5.2 ns and 0.473/3.2 ns, respectively, and the fluorescence spectrum of compound 2 was blue-shifted significantly. Transient absorption spectroscopic investigations showed the quantum yield/life time of first excited triplet(T₁) state of compounds 1 and 2 in toluene were 0.47/58 μs and 0.63/34 μs respectively.

Key words: Biscorrole, Gallium, Fluorescence, Transient absorption spectrum

CLC Number:

O614

TrendMD:

CHEN Huan, WANG Lili, ZHAN Xuan, HE Shuang, ZHANG Hao, WANG Hui, JI Liangnian, LIU Haiyang. Synthesis and Photoluminescent Property of a Phenyl Bridged Biscorrole Gallium Complex^†[J]. Chem. J. Chinese Universities, 2014, 35(10): 2061.

Figures/Tables 7

Scheme 1 Structures and synthetic routes of phenyl bridged biscorrole(1) and its gallium complex(2)

Fig.1 UV-Vis spectra of free base biscorrole 1(a) and its gallium complex 2(b)

Fig.2 Emission spectra of free base biscorrole 1(a) and its gallium complex 2(b) in toluene(λex=550 nm)

Fig.3 Fluorescence decay curves of free base biscorrole 1(A) and its gallium complex 2(B) in toluene at room temperature

Table 1 Fluorescence lifetime(τf), fluorescence quantum yield(Φu) , nonradiative and radiative decay rate constants(Knr, Kr) of compounds 1 and 2 in toluene

Sample	λ_em/nm	τ_f/ns	Φ_u	10^-8 K_nr/s^-1	10^-8K_r/s^-1
1	651	5.2	0.142	1.650	0.270
2	607	3.2	0.473	1.647	1.480

Fig.4 Transient absorption spectra of free base biscorrole 1(A, B) and its gallium complex 2(C, D) in toluene Insets are the decay curves at maximum absorption. (A, C) Aerobic; (B, D) oxygen-free.

Table 2 Triplet extinction coefficient, triplet quantum yield, intersystem crossing rate constant, triplet lifetime and triplet quenching rate constant by oxygen of compounds 1 and 2

Compound	λ_T/nm	ε_T/(L·mol^-1·cm^-1)	Φ_T	10^-8k_isc/s	τ_T/ns	$τ T 0$ /μs	10^-9 $k q T$ /(L·mol^-1·s^-1)
1	465	29532	0.47	0.90	250	58.0	1.90
2	455	46139	0.63	1.97	405	34.0	1.16

Table 2 Triplet extinction coefficient, triplet quantum yield, intersystem crossing rate constant, triplet lifetime and triplet quenching rate constant by oxygen of compounds 1 and 2

Compound	λ_T/nm	ε_T/(L·mol^-1·cm^-1)	Φ_T	10^-8k_isc/s	τ_T/ns	$τ T 0$ /μs	10^-9 $k q T$ /(L·mol^-1·s^-1)
1	465	29532	0.47	0.90	250	58.0	1.90
2	455	46139	0.63	1.97	405	34.0	1.16

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