title: Spectral studies and molecular orbital PPP-calculations of some azo-dyes.
abstract: The UV, IR and 1H-NMR spectra of some 4-(R-phenyl azo) 1-hydroxy 2-naphthoic acid derivatives are studied. The effects of substituent groups and the solvent polarity on electronic spectral, IR bands and 1H-NMR proton chemical shifts are considered, the molecular orbital calculations obtained are rationalized quantitatively with that obtained practically using the PPP-model with configuration interaction (CI).
authors.forename: A S
authors.initials: AS
authors.lastname: Shalabi
authors.forename: H A
authors.initials: HA
authors.lastname: Dessouki
authors.forename: Y M
authors.initials: YM
authors.lastname: Issa
authors.forename: I S
authors.initials: IS
authors.lastname: Ahmed
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013057:Spectrum Analysis
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents