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Vibrational spectroscopic studies of hydrogen‒bonded complexes between 2,5-dihydroxy-P-benzoquinone and amines
A series of 1 :1 hydrogen-bonded complexes between 2,5-dihydroxy-P-benzoquinone (DHBQ) and various nitrogen bases of different strengths were prepared. The FT-IR spectra of the prepared complexes were examined in different regions. It has been found that the protonic and carbonyl vibrations are strongly affected by protonation. The intensity of protonic vibrations was estimated, the base line was corrected by using Perkin-Elmer Paragon 1000 program. A maximum was found at pKa= 5.6 in thedoi:10.1155/2001/721903 fatcat:s6rxdktgwvaxflgloupyucdsb4