title: Synthesis, Spectral Characterization and Fluorescent Assessment of 1,3,5-Triaryl-2-pyrazoline Derivatives: Experimental and Theoretical Studies.
abstract: 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.
authors.affiliation: Department of Chemistry, Al al-Bayt University, Mafraq, 25113, Jordan.
authors.forename: Mohammad M
authors.initials: MM
authors.lastname: Ibrahim
authors.affiliation: Department of Chemistry, Al al-Bayt University, Mafraq, 25113, Jordan.
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Al-Refai
authors.affiliation: Department of Chemistry, COMSATS Institute of Information Technology, Abbottabad, 22060, Pakistan.
authors.forename: Khurshid
authors.initials: K
authors.lastname: Ayub
authors.affiliation: Department of Chemistry, Al al-Bayt University, Mafraq, 25113, Jordan. bfali@kfu.edu.sa.|Department of Chemistry, King Faisal University, Al-Hasa, Saudi Arabia. bfali@kfu.edu.sa.
authors.forename: Basem F
authors.initials: BF
authors.lastname: Ali
keywords: Chalcone; DFT calculations; Fluorescence; Pyrazolines; Spectral characterization