Beeby A, Jones A E
Department of Chemistry, University of Durham, South Road, Durham DH1 3LE, UK.
J Photochem Photobiol B. 2001 Nov 15;64(2-3):109-16. doi: 10.1016/s1011-1344(01)00197-x.
The results of a comprehensive investigation of the photophysical properties of the sunscreen analogue, N-acetyl menthyl anthranilate (NAMA), in various solvent systems are reported. Luminescence studies reveal that this compound is fluorescent (Phi(f)=0.16+/-0.01) in toluene and has a solvent dependent emission maximum in the range 363-370 nm. Phosphorescence has also been detected in low temperature glasses with an emission maximum at 420 nm in EPA, and a lifetime of 1.3 s; the triplet energy was found to be 311+/-3 kJ mol(-1). Kinetic UV-visible absorption measurements revealed a transient species with absorption maxima at 450 nm and solvent dependent lifetimes of 120-240 micros which are attributed to the triplet state. The triplet state is efficiently quenched by oxygen, leading to the formation of singlet oxygen in all of the solvent systems studied. The singlet oxygen quantum yields (Phi(Delta)), determined by time-resolved near-infrared luminescence measurements, were in the range 0.19-0.21.
报道了对防晒类似物N - 乙酰邻氨基苯甲酸薄荷酯（NAMA）在各种溶剂体系中的光物理性质进行全面研究的结果。发光研究表明，该化合物在甲苯中具有荧光性（Φ(f)=0.16±0.01），并且在363 - 370 nm范围内有一个依赖于溶剂的发射最大值。在低温玻璃中也检测到了磷光，在EPA中发射最大值为420 nm，寿命为1.3 s；发现三重态能量为311±3 kJ mol(-1)。动力学紫外 - 可见吸收测量揭示了一种瞬态物种，其吸收最大值在450 nm，寿命依赖于溶剂，为120 - 240微秒，这归因于三重态。三重态被氧气有效猝灭，导致在所研究的所有溶剂体系中形成单线态氧。通过时间分辨近红外发光测量确定的单线态氧量子产率（Φ(Δ)）在0.19 - 0.21范围内。
