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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Dual Fluorescence and Multiple Charge Transfer Nature in Derivatives of N-Pyrrolobenzonitrile
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Dual Fluorescence and Multiple Charge Transfer Nature in Derivatives of N-Pyrrolobenzonitrile

机译：N-吡咯并苄腈衍生物的双重荧光和多重电荷转移性质

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摘要

N-Pyrrolobenzonitrile (PBN), its ester derviative PBAEE, and a more twisted model compound DPBN have been compared regarding absorption and fluorescence properties. A long wavelength absorption shoulder in DPBN has been assigned to the charge transfer (CT) state. In polar solvents, single-fluorescence bands with a strong solvatochromic effect establish a CT nature of the emission for all compounds. The long radiative lifetime (ca. 130 ns for PBN, 700 ns for DPBN in CH↓(2)Cl↓(2)) points to a forbidden emission, and the 5-fold longer value for DPBN indicates a difference in CT nature tentatively assigned to conformations differing in the twist angle. Even in low-temperature polar solvent glasses, the single-fluorescence band of PBN is of CT nature and develops into a dual fluorescence by thermal activation. Also in alkanes, the increased fluorescence rate constants and the temperature effect on spectral structuring indicate emission from an equilibrium involving a CT state with an unstructured spectrum and a less polar locally excited state with structured emission.
机译：已比较了N-吡咯并苄腈（PBN），其酯衍生物PBAEE和更扭曲的模型化合物DPBN的吸收和荧光性质。 DPBN中的长波长吸收肩峰已分配给电荷转移（CT）状态。在极性溶剂中，具有很强溶剂致变色作用的单荧光带建立了所有化合物发射的CT性质。较长的辐射寿命（PBN约为130 ns，CH↓（2）Cl↓（2）中的DPBN约为700 ns）表明发射被禁止，而DPBN的5倍更长的值则初步表明了CT性质的差异。分配给扭转角不同的构造。即使在低温极性溶剂玻璃中，PBN的单荧光带也具有CT性质，并通过热活化发展为双荧光。同样在烷烃中，增加的荧光速率常数和温度对光谱结构的影响表明，该发射来自平衡，该平衡包括具有非结构化光谱的CT状态和具有结构化发射的极性较小的局部激发态。

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