Spectroscopic and Dynamic Studies of Near-Infrared Metastable Species

• Main Authors: Ming-Zen Lee, 李銘仁
• Other Authors: Pi-Tai Chou
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/04974272140436744358

碩士 === 國立中正大學 === 化學研究所 === 87 === My research focuses on three topics which are mainly the successive works based on our achievements on the near IR metastable species. First of all, the photolysis of molecular iodine in solution phase has been investigated by Fourier transform techniques coupled with an ultrasensitive near-infrared detecting system. The spectral features and relaxation dynamics of the resulting 1200-1600 nm emission revealed strong solvent dependence. Detailed analyses conclude that the emitting species are attributed to the iodine atom (2P1/2 R 2P3/2) magnetic dipole transition in the near infrared perturbed by iodine atom-solvent complexes. On the other hand, the chemiluminescence of O2(1Dg) expelled from the UV photolysis of vanadium(V)-peroxo (VP) complexes in aqueous solution was observed for the first time. Using phenalenone-photosensitization as a standard reference, the 1O2 quantum yields from the photolysis of twelve VP complexes were measured. No good correlation was found between the relative DNA-photocleavage activities and the 1O2 quantum yields of these complexes. This lack of correlation underscores the significant contribution of the complex-DNA binding interaction in determining the observed DNA-photocleavage activity of the complex. The small 1O2 quantum yields observed in these complexes were interpreted in terms of the minor 1O2 photo-elimination channel relative to other more efficient relaxation processes. Finally, I have successfully applied the step-scan Fourier transform technique coupled with the transient absorption and/or emission spectroscopy to investigate dynamics of structural change during chemical reactions in NIR and MIR regions.