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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Spectroscopic studies on 2,3,4,5-tetraphenylpyrylium salts with and without silver (I)-bridged structures
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Spectroscopic studies on 2,3,4,5-tetraphenylpyrylium salts with and without silver (I)-bridged structures

机译：具有和不具有银（I）-桥联结构的2,3,4,5-四苯基吡啶鎓盐的光谱研究

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摘要

Two novel phenylated pyrylium compounds, silver (I)-bridged 2,3,4,5-tetraphenylpyrylium perchlorate (PI) and its silver (I)-free pyrylium ligand (P2) were prepared from 1,2,3,4-tetraphenylcyclopentadiene to examine their spectroscopic behaviors. The UV/vis absorption and fluorescent emission spectra of PI and P2, measured in three solvents (acetonitrile, dichloromethane and toluene), reveal that the photophysical behaviors are closely related to silver (1) fragment, and strongly dependent on solvent polarity. In polar acetonitrile, PI displays longer absorption wavelength and much lower fluorescent emission intensity than P2, although they exhibit much similarity in shape. In contrast, in nonpolar toluene, while P2 shows an apparent absorption band at 338 nm, PI displays a tail-like line without absorption band observed. All the spectra obtained indicate a better coplanarity and a stronger intra-molecular charge transfer in P I due to the effect of silver (1) fragment. Additionally, the H-1 NMR spectra of P1 and P2, which were recorded under the same conditions, indicate that the silver (1) fragment reinforces pyrylium ring's capacity to localize the formal positive charge within the heterocyclic ling. (c) 2005 Elsevier B.V. All rights reserved.
机译：由1,2,3,4-四苯基环戊二烯制备了两种新颖的苯基化吡啶鎓化合物，即桥联2,3,4,5-四苯基吡啶鎓高氯酸银（PI）及其不含银（I）的吡啶鎓配体（P2）。检查他们的光谱行为。在三种溶剂（乙腈，二氯甲烷和甲苯）中测得的PI和P2的紫外/可见吸收光谱和荧光发射光谱表明，光物理行为与银（1）片段密切相关，并且强烈依赖于溶剂极性。在极性乙腈中，尽管PI的形状非常相似，但其显示的吸收波长更长，且荧光发射强度比P2低得多。相比之下，在非极性甲苯中，尽管P2在338 nm处表现出明显的吸收带，但PI却显示出一条尾巴状的线而未观察到吸收带。由于银（1）片段的作用，获得的所有光谱均表明在P I中具有更好的共面性和更强的分子内电荷转移。此外，在相同条件下记录的P1和P2的H-1 NMR光谱表明，银（1）片段增强了吡咯鎓环在杂环环内定位形式正电荷的能力。 （c）2005 Elsevier B.V.保留所有权利。

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