title: Synthesis, spectroscopic properties and theoretical studies of bis-Schiff bases derived from polyamine and pyrazolones.
abstract: A series of novel bis-Schiff base were synthesized from 1-aryl-3-methyl-4-benzoyl-5-pyrazolones and diethylenetriamine (or triethylenetetramine) as the starting materials. All of these bis-Schiff bases were characterized by means of NMR, IR, and MS. The UV-vis absorption spectra and fluorescent spectra of these bis-Schiff bases were also measured. Moreover, the B3LYP/6-31G(d) method was used to optimize the ground state geometry of the bis-Schiff bases; and the UV-vis spectroscopic properties of the products were computed and compared with corresponding experimental data based on cc-pVDZ basis set of TD-B3LYP method. It has been found that all of these bis-Schiff bases show a remarkable absorption peak in a wavelength range of 270-340 nm; and their maximum emission peaks are around 348 nm.
authors: Fine Chemistry and Engineering Research Institute, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, People's Republic of China. rtg@henu.edu.cn
authors: Tiegang
authors: T
authors: Ren
authors: Shuyun
authors: S
authors: Liu
authors: Guihui
authors: G
authors: Li
authors: Jinglai
authors: J
authors: Zhang
authors: Jia
authors: J
authors: Guo
authors: Weijie
authors: W
authors: Li
authors: Lirong
authors: L
authors: Yang
mesh_terms: D000042:Absorption; D008968:Molecular Conformation; D011073:Polyamines / Q000737:chemistry*; D047069:Pyrazolones / Q000737:chemistry*; D012545:Schiff Bases / Q000138:chemical synthesis* / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D011073:Polyamines; D047069:Pyrazolones; D012545:Schiff Bases