HOMEPRODUCTSCOMPANYCONTACTFAQResearchDictionaryPharmaSign Up FREE or Login

Solid-state photochromic behavior and thermal bleaching kinetics of two novel pyrazolone phenylsemicarbazones.

Abstract
Two novel photochromic compounds, 1,3-diphenyl-4-benzal-5-hydroxypyrazole 4-phenylsemicarbazone (1 a) and 1,3-diphenyl-4-(4-nitrobenzal)-5-hydroxypyrazole 4-phenylsemicarbazone (2 a), are synthesized and characterized by elemental analysis, mass spectrometry, FTIR spectroscopy, and (1)H NMR spectroscopy. Their properties, including photochromic behavior, fluorescence properties, and thermal bleaching kinetics, are investigated. The results show that the two compounds exhibit improved photochromic performance in coloration and thermal bleaching rates, excellent photostability, high fatigue resistance, and reversible fluorescence switching properties in the solid state in comparison to reported pyrazolone thiosemicarbazones. The thermal bleaching process obeys first-order kinetics. Bleaching of powders at 130 °C is completed within 90 s for 1 b (the colored isomer of 1 a) and 150 s for 2 b (the colored isomer of 2 a). The activation energy for the thermal bleaching process is determined to be 69 and 95 kJ mol(-1) , with frequency factors of 9.5×10(7) and 9.4×10(10) s(-1) for 1 b and 2 b, respectively.
AuthorsSamat Abdurehman, Lang Liu, Dianzeng Jia, Jianping Hu, Jixi Guo, Xiaolin Xie
JournalChemphyschem : a European journal of chemical physics and physical chemistry (Chemphyschem) Vol. 12 Issue 12 Pg. 2338-44 (Aug 22 2011) ISSN: 1439-7641 [Electronic] Germany
PMID21748840 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
CopyrightCopyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Chemical References
  • Fluorescent Dyes
  • Phenols
  • Semicarbazones
Topics
  • Drug Stability
  • Fluorescence
  • Fluorescent Dyes (analysis, chemical synthesis)
  • Isomerism
  • Kinetics
  • Magnetic Resonance Spectroscopy
  • Molecular Imaging (methods)
  • Phenols (chemistry)
  • Photochemical Processes (radiation effects)
  • Semicarbazones (analysis, chemical synthesis)
  • Spectroscopy, Fourier Transform Infrared
  • Thermodynamics
  • Ultraviolet Rays

Join CureHunter, for free Research Interface BASIC access!

Take advantage of free CureHunter research engine access to explore the best drug and treatment options for any disease. Find out why thousands of doctors, pharma researchers and patient activists around the world use CureHunter every day.
Realize the full power of the drug-disease research graph!


Choose Username:
Email:
Password:
Verify Password:
Enter Code Shown: