Photophysical Properties of a Three-Dimensional Zinc(II) Porphyrin Box
Photophysical Properties of a Three-Dimensional Zinc(II) Porphyrin Box
复制标题
三维锌(II)卟啉盒的光物理性质
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
A. Osuka
中科院分区：
文献类型：
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作者：
I. Hwang;H. Cho;D. Jeong;Dongho Kim;Akihiko Tsuda;Takashi Nakamura;A. Osuka
通过吸收、荧光、皮秒时间分辨荧光/荧光各向异性、共振拉曼和飞秒瞬态吸收测量，比较研究了三维锌（II）卟啉盒（(PyZ2)4）及其组成单元（正交连接的卟啉二聚体如PyZ2和Z2）的光物理性质。在CH2Cl2中，PyZ2的荧光和荧光激发光谱对温度的依赖性可以忽略不计，这表明卟啉盒在~ 10 ~ 40℃的温度范围内不容易被打乱。短寿命（~ 1ns）荧光衰减分量的增强以及ν2和ν4拉曼带的位移表明，由于卟啉盒中锌（II）卟啉部分的五配位，卟啉环平面度受到了一定程度的干扰。在时间分辨荧光各向异性衰减测量中，相对较慢的旋转扩散时间为~ 4.7 ns, r∞= 0，表明卟啉箱形腐蚀是有效的。
Photophysical properties of a three-dimensional zinc(II) porphyrin box ((PyZ2)4) and its constituent unit (orthogonally linked porphyrin dimers such as PyZ2 and Z2) have been comparatively investigated by absorption, fluorescence, picosecond time-resolved fluorescence/fluorescence anisotropy, resonance Raman, and femtosecond transient absorption measurements. The negligible temperature dependence on the fluorescence and fluorescence excitation spectra of PyZ2 in CH2Cl2 indicates that the porphyrin box is not easily disorganized in the temperature range of ∼10−40 °C. The enhancement of a short-lived (∼1 ns) fluorescence decay component, as well as the shifts of the ν2 and ν4 Raman bands, indicates that the porphyrin ring planarity is somewhat perturbed, because of the five-coordination of the zinc(II) porphyrin moiety in the porphyrin box. The relatively slow rotational diffusion time of ∼4.7 ns and r∞ = 0 in the time-resolved fluorescence anisotropy decay measurement illustrates that the porphyrin box rot...