Solvent and Methyl Group Effects on the Electronic Spectral Properties of Azo-2-Naphthol Dye
Victor N. Mkpenie, Emmanuel E. Essien
Chemical Science International Journal · pp. 1–8 · Published 1 Jun 2015
10.9734/ACSJ/2015/17260Abstract
The influence of solvent polarity on the absorption pattern of azo-2-naphthol dyes,1-(4-methylphenylazo)-2-naphthol (MPAN) and 1-phenylazo-2-naphthol (PAN) have been studied using a UV-Visible spectrophotometer in polar and non-polar solvents. Analysis of the spectral data obtained revealed two types of effects - the polar effect (tPE) and the non-polar effect (tNPE) - exhibited when polar and non-polar solvents are used respectively. These effects can affect differently, the direction of shift in the wavelength (λmax) of electronic absorption of azo-2-naphthol dyes bathochromically or hypsochromically. Linear solvation energy relationships (LSER) have been used to quantify the interactions between solvents and dyes. The overall solute-solvent interaction had contributions from polarizability/dipolarity, hydrogen bond donor (HBD) and hydrogen bond acceptor (HBA) abilities.
Cited by 3
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