Ibrahim Mohammad M, Al-Refai Mahmoud, Ayub Khurshid, Ali Basem F
Department of Chemistry, Al al-Bayt University, Mafraq, 25113, Jordan.
Department of Chemistry, COMSATS Institute of Information Technology, Abbottabad, 22060, Pakistan.
J Fluoresc. 2016 Jul;26(4):1447-55. doi: 10.1007/s10895-016-1837-9. Epub 2016 May 24.
Two new pyrazoline derivatives, namely 5-(4-bromophenyl)-3-(5-chlorothiophen-2-yl)-1-phenyl-4,5-dihydro-1H-pyrazole (3) and 5-(4-bromophenyl)-3-(2,5-dichlorothiophen-3-yl)-1-phenyl-4,5-dihydro-1H-pyrazole (4) have been synthesized and characterized based on their spectral (IR, (1)H and (13)C NMR and MS) data and microanalysis. The fluorescence properties of 3 and 4 were studied by UV-Vis and emission spectroscopy. For compound 3, a fluorescence emission was observed in the blue region of the visible spectrum. The effect of different solvents on fluorescence was also investigated. Density Functional Theory calculations have also been performed to gain insight into geometric, electronic and spectroscopic properties of the pyrazoline derivatives. Both structures are analysed and compared in order to rationalize the different behaviour in 3 and 4.
合成了两种新型吡唑啉衍生物，即5-(4-溴苯基)-3-(5-氯噻吩-2-基)-1-苯基-4,5-二氢-1H-吡唑(3)和5-(4-溴苯基)-3-(2,5-二氯噻吩-3-基)-1-苯基-4,5-二氢-1H-吡唑(4)，并根据它们的光谱(红外光谱、1H和13C核磁共振光谱以及质谱)数据和微量分析对其进行了表征。通过紫外-可见光谱和发射光谱研究了3和4的荧光性质。对于化合物3，在可见光谱的蓝色区域观察到荧光发射。还研究了不同溶剂对荧光的影响。还进行了密度泛函理论计算，以深入了解吡唑啉衍生物的几何、电子和光谱性质。对这两种结构进行了分析和比较，以便合理解释3和4的不同行为。
