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Chapter III CHN Analysis, FT IR …..
envelope between 3700 cm -1 and 2500 cm -1 due to O-H stretching vibrations of
KDP. Hydrogen bonding within the crystal is suggested to be the cause for the
broadening of the peak. The C-H vibrations of CH3 group in Potassium acetate
are seen to provide its characteristics peaks just below 3000 cm -1 , which is
absent in pure KDP crystal and confirmed the successful achievement of
doping. Gunasekaran and Ramkumar [15] have studied the FT-IR spectra of
pure and - histidine doped KDP crystals and confirmed the presence of -
histidine. In another study, Suresh Kumar and Rajendra Babu [16] have studied
the FT-IR spectra of pure and amino acids doped KDP crystal and observed
that some bands of [H2PO4] - overlap with amino acid vibrations and some of
the frequencies are slightly shifted. The symmetric deformation of NH3 + ion
appears at around 1500 cm -1 with medium intensity which revealed the
incorporation of impurities in the crystals. The FTIR spectra of pure and glycine
doped KDP crystals have been studied by Hussaini et al [17]. They concluded
that the 3703.29 cm -1 and 3318 cm -1 may represent the O-H stretching of
unchanged COOH group of the amino acid. The involvement of NH3 + in
hydrogen bonding is evident by the fine structure of the band at lower energy
region. Recently, Parikh et al [18] have studied the FTIR spectra of pure and L-
alanine doped KDP crystals and confirmed the presence of NH 3+ stretching
vibration, O–H stretching, symmetrical bending vibration and torsion oscillation
of the NH3 + group. They confirmed L-alanine doping by the absorption due to
N-H, C=O, C-H remained present in doped crystals and absent in pure KDP
crystals. Rahman and Podder [19] have studied the FTIR spectra of the pure
and EDTA-added KDP crystal. Broad envelope between 3700 cm −1 and 2500
cm −1 includes O–H stretching vibrations of KDP. Hydrogen bonding within the
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