The Effect of Substituent on the Temperature Sensitive Properties of Imidazo[4,5-f]-1,10-phenanthroline Ruthenium(Ⅱ) Complex

doi:10.7517/j.issn.1674-0475.2015.06.468

Abstract

Abstract:

Three imidazo[4,5-f]-1,10-phenanthroline derivatives L¹-L³,with different substitutes, and their Ru(Ⅱ) complexes have been synthesized and characterized. These Ru(Ⅱ) complexes show characteristic π→π^* transition and metal-ligand charge transfer (MLCT) transition absorptions, and emission maximums at 590 nm. The Ru(Ⅱ) complexes have been doped into the Poly(methyl methacrylate) (PMMA) and obtained the temperature sensitive paint. In PMMA film, the fined structure of the absorption spectra of the Ru(Ⅱ) complexes disappeared, and a new emission peak at the longer wavelength (663 nm) appeared, indicating the aggregation of Ru(Ⅱ) complexes. The emission intensity of the Ru(Ⅱ) complexes in PMMA film decreases gradually with increase of the temperature. The activation energy of non-radiative process (E_nr) temperature sensitivity (S_T) of compounds are calculated in the range of 30-60 ℃ and 60-90 ℃, respectively. The results indicate that [Ru(L¹)₃] with phenyl substituted imidazo[4,5-f]-1,10-phenanthroline has relatively higher S_T than [Ru(L²)₃] with imidazo[4,5-f]-1,10-phenanthroline and [Ru(L³)₃] with alkyl substituted imidazo[4,5-f]-1,10-phenanthroline.

Key words: temperature sensitive paints, Ru(Ⅱ) complex, temperature sensitivity, poly(methyl methacrylate) film

GAO Yunyan, WANG Zichao, OU Zhize, JU Baolong, HUANG Gan, FENG Zhao. The Effect of Substituent on the Temperature Sensitive Properties of Imidazo[4,5-f]-1,10-phenanthroline Ruthenium(Ⅱ) Complex[J]. Imaging Science and Photochemistry, 2015, 33(6): 468-478.

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