Nitta, Yoshihiro; Tomii, Reiko; Yoneda, Fumio published the artcile< Pyridazine derivatives. IV. The structures of aminopyridazines>, Computed Properties of 20744-39-2, the main research area is CHEMISTRY, PHARMACEUTICAL; EXPERIMENTAL LAB STUDY; PYRIDAZINES; SPECTRUM ANALYSIS.
The infrared spectra of 3(I) and 4-aminopyridazine (II) and their N-deuterated derivatives (III) were examined with KBr discs and in CHCl3 solution, and compared with those of 2- (IV), 3- (V), and 4-aminopyridine (VI), and PhNH2 (VII). III were prepared by adding excess D2O to I and II, evaporating the excess D2O, and repeating the procedure 4 times. The amino form of I and II was confirmed. The structural similarity of II to VI, and that of I to IV were clearly indicated. Curves were shown in the region 800-3500 cm.-1 for I-III in KBr disc, and in the 3000 cm-.1 and 700-1800 cm. -1 regions for I, II, and IV-VII in 0.016M CHCl3 solution, and the assignment of bands made and discussed. Furthermore, the correlation between the position and the nature of the substituent was discussed. Thus, the structures of I and II involve resonance with the excited states VIII and IX, resp., with a greater contribution from the p-quinoid type IX than from VIII, resulting in slight differences in the nature of the NH2 groups in I and II and, therefore, differences in their infrared absorptions.
Chemical & Pharmaceutical Bulletin published new progress about IR spectra. 20744-39-2 belongs to class pyridazine, and the molecular formula is C4H5N3, Computed Properties of 20744-39-2.
Referemce:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem