The luminescent properties of four pyridine carboxylic acid-europium complexes were investigated by infrared absorption,fluorescence and time-resolved fluorescent spectroscopy.The influences of structure of complex co...The luminescent properties of four pyridine carboxylic acid-europium complexes were investigated by infrared absorption,fluorescence and time-resolved fluorescent spectroscopy.The influences of structure of complex compounds,solvents and pH of the media on the emission intensity and the lifetime are discussed as well.展开更多
The wool which were processed by rare earth in the dyeing processes have soft and loose hair withpure-white tone and silky luster. A few papers concerned with the mechanism of wool dyeing in the presenceof rare earth~...The wool which were processed by rare earth in the dyeing processes have soft and loose hair withpure-white tone and silky luster. A few papers concerned with the mechanism of wool dyeing in the presenceof rare earth~[1,2]. However, the distribution of the combining of rare earth ions with wool toward the color andluster of woollen has not been discussed yet. In this paper, the whitening effect of Inner Mongolia goatwoolprocessed by rare earth after coarse wool were pulled out was investigated by electronic spectral ana-lysis. The wool samples including normal and rare earth processed Inner Mongolia goat wool were supplied展开更多
In 1982, A. B. P. Lever reported that μ-oxo-bis-phthalocyaninato iron （Ⅲ） （PcFe<sup>Ⅲ</sup>）<sub>2</sub>O photoreduced when irradiated under nitrogen, yielding PcFe（Ⅱ） and an oxoiron ...In 1982, A. B. P. Lever reported that μ-oxo-bis-phthalocyaninato iron （Ⅲ） （PcFe<sup>Ⅲ</sup>）<sub>2</sub>O photoreduced when irradiated under nitrogen, yielding PcFe（Ⅱ） and an oxoiron species. The mechanism of this photo-disproportionation remained in question. We have synthesized tetra-4-tert-amylphenoxy-phthalocyaninato-iron （Ⅱ）. It dissolves in benzene containing pyridine and absorbs oxygen in the air forming （PcFe<sup>Ⅲ</sup>）<sub>2</sub>O with absorption at 620 nm. Irradiation of a degassed solution of （PcFe<sup>Ⅲ</sup>）<sub>2</sub>·展开更多
Nanosecond time-resolved transient absorption spectra of pyrene-triphenylamine, pyrenediphenylamine, pyrene-N, N-dibenzylaniline systems in various solvents have been investigated. In nonpolar solvent, pyrene-tripheny...Nanosecond time-resolved transient absorption spectra of pyrene-triphenylamine, pyrenediphenylamine, pyrene-N, N-dibenzylaniline systems in various solvents have been investigated. In nonpolar solvent, pyrene-triphenylamine exciplex and pyrene-N, N-dibenzylaniline exciplex were observed directly. In acetonitrile, the pyrene anion radical, triphenylamine and diphenylamine cation radicals were detected. On the basis of the present experimental facts, the mechanism of fluorescence quenching processes of pyrene in polar and nonpolar solvents has been established.展开更多
文摘The luminescent properties of four pyridine carboxylic acid-europium complexes were investigated by infrared absorption,fluorescence and time-resolved fluorescent spectroscopy.The influences of structure of complex compounds,solvents and pH of the media on the emission intensity and the lifetime are discussed as well.
文摘The wool which were processed by rare earth in the dyeing processes have soft and loose hair withpure-white tone and silky luster. A few papers concerned with the mechanism of wool dyeing in the presenceof rare earth~[1,2]. However, the distribution of the combining of rare earth ions with wool toward the color andluster of woollen has not been discussed yet. In this paper, the whitening effect of Inner Mongolia goatwoolprocessed by rare earth after coarse wool were pulled out was investigated by electronic spectral ana-lysis. The wool samples including normal and rare earth processed Inner Mongolia goat wool were supplied
文摘In 1982, A. B. P. Lever reported that μ-oxo-bis-phthalocyaninato iron （Ⅲ） （PcFe<sup>Ⅲ</sup>）<sub>2</sub>O photoreduced when irradiated under nitrogen, yielding PcFe（Ⅱ） and an oxoiron species. The mechanism of this photo-disproportionation remained in question. We have synthesized tetra-4-tert-amylphenoxy-phthalocyaninato-iron （Ⅱ）. It dissolves in benzene containing pyridine and absorbs oxygen in the air forming （PcFe<sup>Ⅲ</sup>）<sub>2</sub>O with absorption at 620 nm. Irradiation of a degassed solution of （PcFe<sup>Ⅲ</sup>）<sub>2</sub>·
基金Project supported by the National Natural Science Foundation of China.
文摘Nanosecond time-resolved transient absorption spectra of pyrene-triphenylamine, pyrenediphenylamine, pyrene-N, N-dibenzylaniline systems in various solvents have been investigated. In nonpolar solvent, pyrene-triphenylamine exciplex and pyrene-N, N-dibenzylaniline exciplex were observed directly. In acetonitrile, the pyrene anion radical, triphenylamine and diphenylamine cation radicals were detected. On the basis of the present experimental facts, the mechanism of fluorescence quenching processes of pyrene in polar and nonpolar solvents has been established.
