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Molecules 2011, 16(9), 7789-7802; doi:10.3390/molecules16097789

Synthesis, Characterization and Fluorescent Property Evaluation of 1,3,5-Triaryl-2-pyrazolines

1,* , 2 and 3
1 Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur-50603, Malaysia 2 Department of Chemistry, Faculty of Science, Quaid-i-Azam University, Islamabad 45320, Pakistan 3 Laboratory of Natural Products, Institute of Bioscience, University Putra Malaysia, Kuala Lumpur 43400, Malaysia
* Author to whom correspondence should be addressed.
Received: 12 July 2011 / Revised: 3 August 2011 / Accepted: 10 August 2011 / Published: 13 September 2011
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A series of 1,3,5-triaryl-2-pyrazolines was synthesized by dissolving the corresponding 4-alkoxychalcones in glacial acetic acid containing a few drops of concentrated hydrochloric acid. This step was followed by the addition of (3,4-dimethylphenyl) hydrazaine hydrochloride. Finally the target compounds were precipitated by pouring the reaction mixture onto crushed ice. The structures of the synthesized compounds were established by physicochemical and spectroscopic methods. The 1,3,5-triaryl-2-pyrazolines bearing homologous alkoxy groups were found to possess fluorescence properties in the blue region of the visible spectrum when irradiated with ultraviolet radiation. The fluorescent behavior of these compounds was studied by UV-Vis and emission spectroscopy, performed at room temperature.
Keywords: triarylpyrazolines; alkoxychalcones; synthesis; fluorescence triarylpyrazolines; alkoxychalcones; synthesis; fluorescence
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hasan, A.; Abbas, A.; Akhtar, M.N. Synthesis, Characterization and Fluorescent Property Evaluation of 1,3,5-Triaryl-2-pyrazolines. Molecules 2011, 16, 7789-7802.

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