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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Comparison of the photophysical properties of a planar, PtOEP, and a nonplanar, PtOETPP, porphyrin in solution and doped films
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Comparison of the photophysical properties of a planar, PtOEP, and a nonplanar, PtOETPP, porphyrin in solution and doped films

机译：溶液和掺杂薄膜中平面PtOEP和非平面PtOETPP卟啉的光物理性质比较

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摘要

The absorption and emission spectroscopic properties of planar (2,3,7,8,12,13,17,18-octaethylporphyrinato)platinum(II) (PtOEP) and nonplanar (2,3,7,8,12,13,17,18-octaethyl-5,10,15,20-tetraphenylporphyrinato)platinum(II) (PtOETPP) complexes have been studied at room temperature. Liquid solutions and doped films, in polystyrene (PS) and epoxy (EPO) polymers, have been investigated. In dilute liquid solution, the photophysical properties of the nonplanar complex are substantially perturbed compared to the planar analogue. Strong ligating solvents further affect the photophysical behavior of both Pt(II) complexes via axial ligation to the central metal ion. At high concentrations, ground state aggregation and excimer formation is observed for PtOEP films in PS and EPO hosts. Incorporation of the nonplanar PtOETPP complex in PS results in enhanced coplanarity of the meso-phenyl groups, leading to a more extended conjugation between the meso-substituents and the π-conjugated system of the macrocycle. A more planar conformer for the nonplanar PtOETPP is present in the EPO host.
机译：平面（2,3,7,8,12,13,17,18-八乙基卟啉铂）（II）（PtOEP）和非平面（2,3,7,8,12,13,17）的吸收和发射光谱性质在室温下研究了1,18-八乙基-5,10,15,20-四苯基卟啉（PtOETPP）配合物。已经研究了聚苯乙烯（PS）和环氧（EPO）聚合物中的液体溶液和掺杂膜。在稀液体溶液中，与平面类似物相比，非平面复合物的光物理性质受到显着干扰。强大的连接溶剂通过轴向连接到中心金属离子进一步影响两种Pt（II）配合物的光物理行为。在高浓度下，在PS和EPO宿主中观察到PtOEP膜的基态聚集和准分子形成。在PS中引入非平面PtOETPP配合物会导致中苯基的共面性增强，从而导致大环的内消旋基团与π共轭体系之间的共轭扩展。在EPO主机中，存在用于非平面PtOETPP的更加平面的构象体。

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