Spectral behaviour and acidity constants of some arylidenes—2-amino-1,3-pyrimidine

Spectral investigation of the intramolecular charge-transfer in some aminotriazole Schiff bases

“…The position of this band is moderately affected by the substituent in the benzene ring, possessing high ε values up to an average of 10,000 mol −1 dm 3 cm −1 . It is assigned to the low energy -* transition of the benzene ring [19,20]. Furthermore, thedelocalized electron cloud resonating within the heterocyclic ring, together with the -electron cloud of the benzene ring, will cause a -* transition to take place along the molecular skeleton of these Schiff bases.…”

2-[(Pyrimidin-2-ylamino)methyl]phenol

“…There are numerous studies on the Schiff bases derived by condensing salicyldehyde and an aromatic amine. In this study, the azomethine double-bond of N-salicylidene-2-aminopyrimidine (El-Haty et al, 1990;Issa et al, 2011;Shalabi & Abdel-Ghani, 1990) is reduced by sodium borohydride to yield the title secondary amine (Scheme I). The two aromatic rings at either ends of the -CH 2 -NH-link of C 11 H 11 N 3 O are twisted by 72.58 (8)°; the hydroxy substituent is hydrogenbond donor to anone N atom of the pyrimidyl ring (Fig.…”

“…For the N-salicylidene-2-aminopyrimidine precursor, see: El-Haty et al (1990); Issa et al (2011); Shalabi & Abdel-Ghani (1990). For a related structure, see: Xu et al (2011).…”