Spectroscopic and lasing characteristics of 7-N,N-diallylamino(-3-aryl)-coumarins and 2-pyrazolines—a new class of potential laser dyes

Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-12-01 DOI:10.1016/0584-8539(94)E0018-6

G.Lokeswara Reddy, C. Santhamma, G.S.P.B. Lakshmi, N. Dhananjava, Y.L.N. Murthy, A.S.R. Anjaneyulu, V.K. Mago, A.K. Ray, B. Lal

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Abstract

The near UV absorption spectra and fluorescence spectra of new coumarin dyes and pyrazolines synthesized in our laboratories are investigated in solution. The effects of solvent and pH factor on the absorption and fluorescence maxima are also studied. The fluorescence lifetimes of coumarins are determined in different solvents. The regression relations for the absorption maxima, fluorescence maxima and fluorescence lifetimes as a function of polarity, refractive index and dielectric constant of the solvent are derived. The lasing maximum peak and range are determined for four of the new coumarins using the Nitrogen Pulsed Dye Laser at L and PT Division, BARC, Bombay. All the dyes investigated are of purity > 99% as determined by high performance liquid chromatography (HPLC). The NMR, mass and IR spectra are recorded for examining the structures. All dyes tested for lasing characteristics are found to be good laser dyes in the blue—green region.

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一类新型激光染料- 7-N, n -二烯丙胺(-3-芳基)-香豆素和2-吡唑啉的光谱和激光特性

研究了本实验室合成的新型香豆素染料和吡唑啉类化合物在溶液中的近紫外吸收光谱和荧光光谱。研究了溶剂和pH对吸收和荧光最大值的影响。测定了香豆素在不同溶剂中的荧光寿命。导出了溶剂极性、折射率和介电常数与吸收最大值、荧光最大值和荧光寿命的回归关系。利用孟买BARC的L和PT部门的氮脉冲染料激光器，确定了四种新型香豆素的激光最大峰和范围。所研究的染料纯度均为100%;99%，高效液相色谱法测定。记录了核磁共振、质谱和红外光谱以检查结构。所有染料的激光特性测试发现，在蓝绿色区域是良好的激光染料。

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Spectrochimica acta. Part A: Molecular spectroscopy

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