位置:成果数据库 > 期刊 > 期刊详情页
Solvent Effects on Photophysical Properties of Copper and Zinc Porphyrins
  • 时间:0
  • 分类:P64[天文地球—地质矿产勘探;天文地球—地质学]
  • 作者机构:[1]Department of Chemistry, School of Applied Science, Beijing University of Science and Technology, Beijing 100083, China
  • 相关基金:Supported by National Natural Science Fundation of China (Grant No. 20873005), Beijing Natural Science Fundation (Grant No. 2083028), Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry and 422 Funds from University of Science and Technology Beijing
  • 相关项目:微胶囊保护法改进生物分子在二氧化硅多孔材料中的适应性
中文摘要:

Zn 的光物理学( tetraphenylporphyrin , TPP ), Zn ( tetra-2,4,6-trimethylphenyl 卟啉, TMP ), Zn (tetra-( o-dichlorophenyl )卟啉, TPPCl 8), Cu ( tetraphenylporphyrin , TPP ), Cu ( tetra-2,4,6-trimethylphenyl 卟啉, TMP ),并且 Cu (tetra-( o-dichlorophenyl )卟啉,在几溶剂的 TPPCl 8, TPPCl 8)在稳定的状态和解决时间的光谱学上被调查了。Cu (TPPCl 8) 是正常的并且不在非极的溶剂在可见或近的紫外区域显示出 CT 转变的证据。然而, Cu (TPPCl 8)shows 在吸收光谱的蓝移动和在在极的溶剂的吸收系列的 intramolecular CT 乐队,它在 650 点显示出荧光最大值排出物 nm 和 8.4 ns 一生。原因能被归因于二个点。第一,溶剂极性的增加能扩大外部组织上的精力,它是有利的减少激活充电器转移转变的免费精力基于电子转移的马库斯理论。而且, Cu 上的内部重原子的效果(TPPCl 8) 令人鼓舞稳定 2 T 1 也说,它从 2 T 1 状态。这结果在为 Cu (II ) octethylporphyrins 的 CT 状态的 640 个 nm 乐队与 10 ns 一生和 CT 吸收的更早的估计一致。引起不平常的荧光的另外的可能的原因喜欢结合 H,轴的 ligands,分子的聚集被排除。

英文摘要:

The photophysics of Zn(tetraphenylporphyrin,TPP), Zn(tetra-2,4,6-trimethylphenyl porphyrin, TMP), Zn (tetra-(o-dichlorophenyl) porphyrin, TPPCI8), Cu(tetraphenylporphyrin,TPP), Cu(tetra-2,4,6-trimethyl- phenyl porphyrin,TMP), and Cu(tetra-(o-dichlorophenyl) porphyrin, TPPCIE, TPPCI8) in several solvents have been investigated on steady state and time-resolved spectroscopy. The Cu(TPPCI8 ) is normal and shows no evidence of CT transition in the visible or near UV regions in nonpolar solvent. However, Cu(TPPCI8)shows a blue shift in the absorption spectrum and intramolecular CT bands at absorption spectra in polar solvent, which shows a fluorescence maximum emission at 650 nm and 8.4 ns lifetime. The reason can be attributed to two points. Firstly, the increase of solvent polarity can enlarge outer reorganisational energy, which is favorable to reduce the activation free energy of charger-transfer transition based on Marcus theory of electron transfer. Moreover, the internal heavy-atom effect on Cu(TPPCIE) is encouraging to stabilize the 2T1 state also, which increases the possibility of population to CT band from 2T1 state. This result is in accord with an earlier estimate of a 10 ns lifetime and CT absorption at 640 nm bands for the CT state of Cu (11) octethylporphyrins. Other possible reasons arousing unusual fluorescence like H-bonding, axial ligands, molecular aggregation are excluded.

同期刊论文项目
同项目期刊论文