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Investigation on the UV spectra of the supermolecular system involving silver nanoparticles–substituted N ‐(phenyl‐ethylene)‐anilines
Author(s) -
Cao ChaoTun,
Liu Junlan,
Cao Chenzhong
Publication year - 2019
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.3993
Subject(s) - chemistry , silver nanoparticle , substituent , absorption spectroscopy , absorption (acoustics) , reaction rate constant , photochemistry , ethylene , excited state , spectral line , nanoparticle , nuclear chemistry , medicinal chemistry , organic chemistry , kinetics , nanotechnology , catalysis , materials science , physics , quantum mechanics , acoustics , nuclear physics , astronomy
The ultraviolet (UV) absorption spectra of the supermolecular system involving silver nanoparticles–substituted N ‐(phenyl‐ethylene)‐anilines were investigated. Silver nanoparticles (AgNPs) and 77 kinds of substituted N ‐(phenyl‐ethylene)‐anilines ZArC (Me)═NArY (ZPEAY, including 40 compounds 2‐H‐XPEAY without ortho‐hydroxyl and 37 compounds 2‐OH‐XPEAY with ortho‐hydroxyl) were prepared. The size of AgNPs was measured with transmission electron microscopy. To study the effect of substituents X and Y on the UV spectra of the supermolecular system of AgNPs‐ZPEAY, the authors measured the UV absorption spectra of AgNPs, ZPEAY, and AgNPs‐ZPEAY solutions. The experimental results show that (a) the size of AgNPs increases in AgNPs‐ZPEAY solution compared with that in AgNPs solution, due to the absorption of ZPEAY molecules on the surface of AgNPs; (b) the UV absorption wavelength of ZPEAY changes in AgNPs‐ZPEAY solution and there is a limitation for the wavelength shift (λ WSL ) between ZPEAY and AgNPs‐ZPEAY system; (c) there is a quantitative correlation between the wavenumber Δν WSL of λ WSL and the substituent constants (Hammett constant σ and excited‐state substituent constant σ CC ex ) of substituents X and Y; (d) the intramolecular hydrogen bonding in 2‐OH‐XPEAY makes the Δν WSL a red shift in AgNPs‐ZPEAY system.