单态氧(1,0)~1Δ_g→~3∑_g^-近红外磷光的直接光谱观察  

DIRECT SPECTROSCOPIC OBSERVATION OF NEAR-INFRARED PHOSPHORESCENCE OF O_2(~1△_g)

作　　者：于英宁[1] 孙孝忠[1] 王文韵[1] 

机构地区：[1]中国科学院长春应用化学研究所

出　　处：《发光学报》1990年第1期55-60,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金

摘　　要：从光谱上直接观察了单态氧～1.07μm谱带。血卟啉、原卟啉、卟啉C和四氯四碘荧光素钠等含极性基团的光敏剂与非极性的四苯基卟吩在相同的溶剂中所产生的谱带形状有所不同,测量了β-胡萝卜素对单态氧的猝灭常数,与文献在1.27μm测得的数值一致。The chemicd and kinetic properties of singlet molecular oxygen in liquid phase have attracted much attention of chemists and biochemists owing to its involvement in many chemical and biological processes . This transient entity, however, had evaded direct observation until a decade ago when the 1270nm luminescence from the forbidden tiansition 1gO2(v = O)-2g-O2(v = O) was detected via photosensitization in solution . The success of this measurement was achieved by using germanium photodiode (with much highei sensitivity in the infrared legion than in the visible region in contrast to photomultipliei tubes) coupled to fast, high-gain amplifiers. However,Ge photodiodes satisfying the measurement of ultra-weak 1270 nm band of O2 (1 g) are not yet available in our country. Based on the results of Krasnovsky in direct observation of singlet oxygen emission at 1270 nm with red-sensitive PMT, it is of interest to see the feasibility to detect the (1, 0) transition emission of O2(1 g) at 1070 nm by using PMT of S-1 photocathode with a spectral response ranging from 300 to 1150 nm, and a successful demonstration of this proposed approach is described in this paper.Our experimental set-up consists of an argon ion laser as the excitation light source, a quartz cuvette with oxygen-saturated sample solution, a monoch-lomator with a 800 nm cut-off filter and its grating blazed at 1100 nm, a GDB -411 PMT operating in the legion of 300-1150 nm, a lock-in amplifier and a recorder.Photosensitizeis employed weie hematoporphyrin(HP), protoporphyrin (PP), porphyrin C (PC), Rose Bengal (RB) and tetraphenylpoiphin (TPP) . These were dissolved in appropriate solvents including watei, ethanol, pyridine, dimethylsulfoxide, dimethylformamide, tetrahydrofuran, acetone, chloroform, carbon tetrachloride, cyclohexane and benzene. For HP, PP, PC, and RB in above-mentioned polar solvents, the O2 (1 g) (1, 0) band is located at 1105 nm (a shift from 1070 to 1105 nm is brought about resulting from the characteristics of monochromator-detector and

关 键 词：单态 氧 红外 磷光 光谱 

分 类 号：O613.3[理学—无机化学]