五氮齿大环金属配合物的光褪色动力学研究

五氮齿大环金属配合物是一类具有潜在应用价值的非线性光学材料。在不同溶液中研究了六种五氮齿金属配合物对不同波长及不同光强下的光褪色动力学过程，实验证明，褪色过程对反应物的初始浓度呈零级反应，是一个受光强控制的光化学过程。光褪色速率常数，对于≥500nm的可见光在1.2×10^-7(苯)～2.0×10^-5h^-1(甲醇)范围内，短波长的可见光使光褪色速率增大一个数量级。吸电子取代基和大半径的金属离子以及强极性溶剂均使该类配合物的光褪色速率增大，但仍然显示出较高的光稳定性。

Photofading kinetics of pentaazadentate macrocyclic metal complexes

Pentaazadentate macrocyclic metal complexes are a kind of novel nonlinear optical materials with great potential applications in the photonics. The photofading kinetics of the complexes has been studied in different solvents by different visible radiations with different optical intensities. The results indicate that the photofading processes obey the zero-order kinetics for the reactant concentrations, which are affected only by the optical intensities and show a characterization of photochemical process. The photofading rate constants are in the range of 1.2×10^-7(in benzene)～2.0 ×10^- 5h^-1(in methanol) at visible wavelength≥500nm, and shorter visible wavelength may enhance the photofading rate constants. Electron- accepting groups, metal ions with large size and strong polar solvents can accelerate the photofading. However, the pentaazadentate metal complexes studied still exhibit higher photostability.