Journal of Electronic Materials

, Volume 48, Issue 2, pp 861–866 | Cite as

Optical Characteristics and Structural Properties of 3-(p-Nitrophenyl)-5-phenyl-1H-pyrazole

  • K. H. IbnaoufEmail author
  • A. O. Elzupir
  • M. A. Ibrahem
  • M. K. M. Ali
  • Muhanna K. Al-Muhanna


In this study, a conjugated 3-(p-nitrophenyl)-5-phenyl-1H-pyrazole (NPP) was synthesized using a microwave-assisted reaction. The photophysical characteristics of NPP, such as absorption, fluorescence, Stokes shift, and fluorescence quantum yield, under different solvent environments, concentrations, and pH values were studied. NPP in ethanol showed an absorption band at 316 nm. Moreover, the shape of the absorption spectrum was not affected by an increase in the concentration. Therefore, there was no aggregation formed in the ground state for all concentrations. On the other hand, the fluorescence spectrum of NPP in ethanol exhibited three distinctive bands around 411 nm, 436 nm, and 463 nm. The intensity of the fluorescence was directly proportional to the concentration even at higher concentrations. Most of the 1H-pyrazoles are affected by the alkalinity and acidity of media. Nevertheless, NPP was not significantly affected by the acidic or alkaline media in the ground or excited states.


1H-pyrazole spectral properties pH effect proton transfer 


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Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  1. 1.Physics Department, College of ScienceAl Imam Mohammad Ibn Saud Islamic University (IMSIU)RiyadhSaudi Arabia
  2. 2.School of Physics, Faculty of Science and TechnologyAlneelain UniversityKhartoumSudan
  3. 3.Committee on Radiation and Environmental Pollution Protection, College of ScienceAl Imam Mohammad Ibn Saud Islamic University (IMSIU)RiyadhSaudi Arabia
  4. 4.Central LaboratoryMinistry of Higher EducationKhartoumSudan
  5. 5.National Nanotechnology CenterKing Abdulaziz City for Science and Technology (KACST)RiyadhSaudi Arabia

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