Chemistry is traditionally divided into organic and inorganic chemistry. The former is the study of compounds containing at least one carbon-hydrogen bonds. 83-07-8, Name is 4-Aminoantipyrine, molecular formula is C11H13N3O, belongs to pyrazoles-derivatives compound, is a common compound. In a patnet, author is Abdolla, Noreldin S. Y., once mentioned the new application about 83-07-8, Computed Properties of C11H13N3O.
Bis-cyclometallated Ir(III) complexes containing 2-(1H-pyrazol-3-yl)pyridine ligands; influence of substituents and cyclometallating ligands on response to changes in pH
Bis-cyclometallated Ir(III) complexes containing 2-(1H-pyrazol-3-yl)pyridine ligands have been synthesised. Their absorption is almost unchanged with changes in pH however the emission intensities vary by a factor of up to three and the complexes have emission pK(a)s in the range 8.0 to 10.0. Substituents on the pyrazole have only a minor effect on the emission pK(a). Surprisingly the complexes with phenylpyrazole cyclometallated ligands 3aL(1-3) showed an intensity decrease with increasing pH (switch off) whilst the corresponding phenylpyridine ones 3cL(1-3) showed an increase in emission intensity with increasing pH. Putting electron-withdrawing CF3 substituents on the cyclometallating phenyls reduced the pK(a) of the complexes to 6.8-7.8, thereby extending the useful pK(a) range; however, in general it tended to reduce the magnitude of the change in emission intensity. Surprisingly the CF3-substituted complexes also showed a complete reversal in the direction of the intensity change when compared to their respective unsubstituted congeners.
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Reference:
Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics