High Pressure-enhanced Dimeric Aggregation in Methylene Blue Solution†

doi:10.7503/cjcu20140312

Abstract

Abstract:

The monomer-dimer equilibrium of methylene blue(MB) in two different solvents[deionized water and 4:1(volume ratio) methanol-ethanol] was studied by in situ high pressure UV-Vis absorption spectroscopy. Using diamond anvil cell, the highest pressure conducted in the experiments was about 0.8 GPa in water and 8.7 GPa in methanol-ethanol solvent. The absorbance ratio of monomer to dimer decreased with the increase of pressure, indicating that high pressure can promote dimerization of MB. On release of pressure, the intensity of the peak did not return to original state, but the absorbance ratio of monomer to dimer returned to the initial value, showing that the changes of the absorption spectra under high pressure are reversible.

Key words: Methylene blue, Diamond anvil cell, Absorption spectrum, High pressure

CLC Number:

TrendMD:

WANG Kai, QI Guangyu, JIANG Zhangmei, LIN Aolei. High Pressure-enhanced Dimeric Aggregation in Methylene Blue Solution^†[J]. Chem. J. Chinese Universities, 2014, 35(11): 2431.

Figures/Tables 3

Fig.1 Absorption spectra of MB in water(6×10-5 mol/L)(A) and 4:1(volume ratio) methanol-ethanol solvent(10-3 mol/L)(B) at different pressures Pressure/GPa: (A) a. 0; b. 0.1; c. 0.2; d. 0.3; e. 0.4; f. 0.5; g. 0.7; h. 0.8.(B) a. 0; b. 1.4; c. 2.1; d. 2.9; e. 3.5; f. 5.1; g. 6.2; h. 8.7.

Fig.2 Absorbance ratio of MB monomer to dimer(Im/Id) as a function of pressure in water(A) and 4:1(volume ratio) methanol-ethanol(B)

Fig.3 Absorption spectra of MB before conducting pressure(a) and after releasing pressure(b) in water(A) and 4:1(volume ratio) methanol-ethanol(B)

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