Spectrophotometric and Thermodynamic Study on the Dimerization Equilibrium of Neutral Red in the Water and Micelle Environments by Chemometrics Methods

Study of Neutral Red dimerization in the water and micelle environments with using of spectrophotometric and chemometrics methods was investigated of the monomer-dimer equilibrium and thermodynamic of Neutral Red. Dimerization constant of Neutral Red was defined from spectrum data with DATAN program. Data obtained from different absorbance by change the temperature in range of 5-75 ℃ at concentrations of Neutral Red (1.73 × 10⁻⁵ M) on spectrum rang of 450-650 nm in the water environment such water-CTAB, water-SDS and water-Triton X-100 in different pH Effect of temperature on the equilibrium constant studied with using of van't Hoff equation and reported quantities of enthalpy and entropy. The result from spectrum data show that DATAN program have good capacity for studying of equilibrium of monomer and dimer.