Asian Journal of Research in Chemistry

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Vibrational Spectral Studies of Nicotinium Picrate


Affiliations
1 Department of Laser Studies, School of physics, Madurai Kamaraj University, Madurai,-625021, India
2 Post Graduate Studies and Research Department of Physics, Lady Doak College, Madurai,-625021, India
3 Post Graduate Studies and Research Department of Chemistry, Raja Doraisingam Government Arts College, Sivagangai-630 561, India
     

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This article describes the vibrational spectra of nicotinium picrate. The Infrared and Raman Spectra were recorded at room temperature for nicotinium picrate and the observed bands were assigned. In nicotinium picrate compound nicotinium is the cation and picrate forming the anion. The N−H···O and O−H···N hydrogen bonds were observed in both infrared and Raman spectra. The structure is also stabilized by C−H···O hydrogen bonding. These hydrogen bonds link the layers of cation with the layers of anions. Nicotinic acid is also known as 3-pyridine carboxylic acid. Picrate being the trinitrophenolate has the characteristic bands of phenol. The nitro group and the phenoxy group stretching are observed in both infrared and Raman spectra. These suggest that the picrate ion is unaffected by the presence of the cations. Factor group analysis has been made and the numbers of vibrational modes have been calculated. The tentative assignments of the observed bands are given.

Keywords

Nicotinium Picrate, Infrared Spectra, Raman Spectra, Intermolecular Hydrogen Bonding, Factor Group Analysis
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  • Vibrational Spectral Studies of Nicotinium Picrate

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Authors

S. Jegannathan
Department of Laser Studies, School of physics, Madurai Kamaraj University, Madurai,-625021, India
M. Briget Mary
Post Graduate Studies and Research Department of Physics, Lady Doak College, Madurai,-625021, India
V. Ramakrishnan
Department of Laser Studies, School of physics, Madurai Kamaraj University, Madurai,-625021, India
S. Thangadurai
Post Graduate Studies and Research Department of Chemistry, Raja Doraisingam Government Arts College, Sivagangai-630 561, India

Abstract


This article describes the vibrational spectra of nicotinium picrate. The Infrared and Raman Spectra were recorded at room temperature for nicotinium picrate and the observed bands were assigned. In nicotinium picrate compound nicotinium is the cation and picrate forming the anion. The N−H···O and O−H···N hydrogen bonds were observed in both infrared and Raman spectra. The structure is also stabilized by C−H···O hydrogen bonding. These hydrogen bonds link the layers of cation with the layers of anions. Nicotinic acid is also known as 3-pyridine carboxylic acid. Picrate being the trinitrophenolate has the characteristic bands of phenol. The nitro group and the phenoxy group stretching are observed in both infrared and Raman spectra. These suggest that the picrate ion is unaffected by the presence of the cations. Factor group analysis has been made and the numbers of vibrational modes have been calculated. The tentative assignments of the observed bands are given.

Keywords


Nicotinium Picrate, Infrared Spectra, Raman Spectra, Intermolecular Hydrogen Bonding, Factor Group Analysis

References