Vibrational Spectral Studies of Bis (Nicotinic Acid) Hydrogen Perchlorate Jegannathan S.1,,*, Mary M. Briget2, Ramakrishnan V.1, Thangadurai S.3 1Department of Laser Studies, School of Physics, Madurai Kamaraj University, Madurai-625021, India 2Post Graduate Studies and Research, Department of Physics, Lady Doak College, Madurai-625021, India 3Post Graduate Studies and Research, Department of Chemistry, Raja Doraisingam Government Arts College, Sivagangai-630 561, India *Corresponding Author E-mail: drstdurai@gmail.com
Online published on 27 March, 2014. Abstract The infrared and Raman spectra of Bis(nicotinic acid) hydrogen perchlorate 2(C6H5NO2)H+(ClO4)− were recorded at room temperature and the assignment of vibrational modes of the observed wave numbers was done. In the Bis (nicotinic acid) the cation has different conformations. The presence of carboxyl group has been observed in the twisted form. The perchlorate anion shows symmetry and sandwiched between bi layers of nicotinic acid. The wave number assignments have been made for the functional groups, viz. COO−, N-H, C-C-N, O-C=O, ClO2 and C-H. One of the two amino acid residues remains in the zwitter ionic form while the other residue exists in the cationic form. The Td symmetry of the (ClO4)− anion has been found to be lowered to C2v corresponding to ClO2 group. Fermi resonance also has been observed. Factor group analysis has been made and the numbers of vibrational modes have been calculated. The tentative assignments of the observed bands are given. Top Keywords Bis(nicotinic acid) hydrogen perchlorate, Infrared spectra, Raman spectra, Inter molecular hydrogen bonding, factor group analysis. Top |