Journal of Scientific and Technical Research (Sharda University, Noida)

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Luminescence Characteristics of 2-Amino-4,6-Diphenylpyrimidine in Different Solvents and at Various pH


Affiliations
1 Department of Chemistry, Annamalai University, Annamalainagar, Tamilnadu, India
2 Chemistry Section, Annamalai University, Annamalainagar, Tamilnadu, India
     

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The absorption and fluorescence spectral properties of 2-amino-4,6-diphenylpyrimidine (ADP) have been investigated in a series of organic solvents of different polarity and in aqueous solutions with Ho/pH/H_ in the range -10 to 17. The largely red shifted fluorescence maximum observed in hydrogen bonding solvents can be attributed to dual intermolecular hydrogen bonding interaction between ADP and the solvents. The correlation between the Stokes shifts and the solvent polarity parameters, is better with ET (30) than with BK values. The low value of correlation coefficient may be due to the presence of both intra-and dual intermolecular hydrogen bonding in polar solvents.The acidity constants for various prototropic reactions in So and S1 states are determined and discussed.

Keywords

2-Amino-4,6-Diphenylpyrimidine, Hydrogen Bonding Interactions, Prototropic Reaction, Solvent Polarity Parameters, Acidity Constant Values.
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  • Luminescence Characteristics of 2-Amino-4,6-Diphenylpyrimidine in Different Solvents and at Various pH

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Authors

P. Siva Kumar
Department of Chemistry, Annamalai University, Annamalainagar, Tamilnadu, India
S. Kothai Nayaki
Chemistry Section, Annamalai University, Annamalainagar, Tamilnadu, India
M. Swaminathan
Chemistry Section, Annamalai University, Annamalainagar, Tamilnadu, India

Abstract


The absorption and fluorescence spectral properties of 2-amino-4,6-diphenylpyrimidine (ADP) have been investigated in a series of organic solvents of different polarity and in aqueous solutions with Ho/pH/H_ in the range -10 to 17. The largely red shifted fluorescence maximum observed in hydrogen bonding solvents can be attributed to dual intermolecular hydrogen bonding interaction between ADP and the solvents. The correlation between the Stokes shifts and the solvent polarity parameters, is better with ET (30) than with BK values. The low value of correlation coefficient may be due to the presence of both intra-and dual intermolecular hydrogen bonding in polar solvents.The acidity constants for various prototropic reactions in So and S1 states are determined and discussed.

Keywords


2-Amino-4,6-Diphenylpyrimidine, Hydrogen Bonding Interactions, Prototropic Reaction, Solvent Polarity Parameters, Acidity Constant Values.