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The FTIR and FT-Raman spectra of 2,3-pyridine-dicarboxylic acid (23PDA); 2,4-pyridine-dicarboxylic acid (24PDA); and 3,4-pyridine-dicarboxylic acid (34PDA) were recorded in the range 4000–450 cm−1 and 4000–50 cm−1, respectively. The optimized geometries and vibrational frequencies along with intensities were computed using DFT employing B3LYP functional with 6-311++G(d,p) basis set. The rms error...
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