溴甲酚紫色的光谱和发光性质

N. Bezlepkina, O. Tchaikovskaya, E. Bocharnikova
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摘要

研究了溶剂对溴甲酚紫色(BCP)光谱发光性能的影响。测定了BCP的光谱特性:半宽Δν1/2,斯托克斯位移Δν cm,摩尔吸收系数ε,本征激发态寿命τ,振子强度f。利用Lippert方程,建立了BCP的Stokes位移与溶剂取向极化率的关系。对实验数据的分析表明,在350 ~ 480nm范围内,BCP吸收带的最大值的位置与溶剂的受体数有关:随着受体数的减少,吸收带的最大值向较短波长区域(水>乙醇>甲苯>丙酮)偏移。BCP对甲苯的吸收能力最低。利用Lippert-Matagi方程,测定了极性质子溶剂激发时偶极矩的变化(16.2 D),由于氢键的形成,偶极矩高于非质子溶剂(10.4 D)。
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Spectral and luminescent properties of bromcresol purple
The influence of the solvent on the spectral-luminescent properties of bromcresol purple (BCP) has been studied. The spectral characteristics of the BCP are determined: half-width Δν1/2, Stokes shift Δν cm , molar absorption coefficient ε, intrinsic excited state lifetime τ, oscillator strength f . Using the Lippert equation, the dependence of the Stokes shift of the BCP on the orientational polarizability of the solvent was constructed. An analysis of the experimental data showed that the position of the maximum of the BCP absorption band in the region of 350-480 nm correlates with the acceptor number of the solvent: with a decrease in the acceptor number, the maximum of the band shifts to a shorter wavelength region (water > ethanol > toluene > acetone). The lowest absorption capacity of BCP was registered in toluene. Using the Lippert-Matagi equation, the change in the dipole moment in polar protic solvents upon excitation (16.2 D) was determined, which is higher than in aprotic solvents (10.4 D) due to the formation of H-bonds.
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