science-softCon uv/vis+ photochemistry database;	www.photochemistry.org; (C) science-softCon 2021

Substance: vanillin					Other Names: 4-hydroxy-3-methoxybenzaldehyde

Formula: C8H8O3						CAS-No.: 121-33-5	PubChem: CID 1183

Study: UV absorption spectra, photodegradation

                
Authors: G. Loisel, M. Mekic, J. Liu, W. Song, B. Jiang, Y. Wang, H. Deng, S. Gligorovski

Title: Ionic strength effect on the formation of organonitrate compounds through photochemical degradation of vanillin in liquid water of aerosols

Journal/Source: Atmos. Env., 246, 118140, (2021); https://doi.org/10.1016/j.atmosenv.2020.118140


Data: diagram, table

Energy/Wavelength range: 200 - 400 nm

Resolution: 1 nm

Temperature: 298 K

Temperature dependence: no

Pressure/Concentration: 1 x 10^-4 mol L-1

Phase: aqueous solution (in the presence of different concentrations of Na2SO4 and NaNO3)

pH:


Comments: The UV/Vis absorption spectra of VL exhibits a hyperchromic effect and a bathochromic shift of the n->Pi* absorption band, in going from lambda(max) = 310 nm in the dilute aqueous 
phase to lambda(max) = 346 nm at I = 0.3 M adjusted by Na2SO4. A hypsochromic shift of the n->Pi* absorption band of VL, in going from lambda(max) = 310 nm in the dilute liquid water to 
lambda(max) = 303 nm at Ieff = 0.124 M is observed when the ionic strength was adjusted with NaNO3.