Bioinorganic Chemistry and Applications

Research Article

Kinetics and Mechanisms of the Chromium(III) Reactions with 2,4- and 2,5-Dihydroxybenzoic Acids in Weak Acidic Aqueous Solutions

Figure 5

(a) UV-Vis spectra of the reaction mixture Cr(III)/2,4-DHBA. Spectra on the left: [2,4-DHBA] = 8,85·10-3 M, [Cr(III)] = 0,067 M,T = 288 K. Spectra on the right: [2,4-DHBA] = 8,85·10-3 M, [Cr(III)] = 0,09 M, T = 298 K. (b) UV-Vis spectra of the reaction mixture Cr(III)/2,5-DHBA. Spectra on the left: [2,5-DHBA] = 8,85·10-3 M, [Cr(III)] = 0,09 M,T = 288 K. Spectra on the right: [2,5-DHBA] = 8,85·10-3 M, [Cr(III)] = 0,09 M, T = 298 K.
832768.fig.005a
(a) Spectra recorded at various times after mixing: 13 min, 23 min,33 min,63 min, 134 min,154 min,184 min
832768.fig.005b
(b) Spectra recorded at various times after mixing: 80 min, 280 min, 480 min, 680 min, 880 min, 1080 min,1280 min, 1500 min
832768.fig.005c
(c) Spectra recorded at various times after mixing: 13 min, 23 min, 33 min, 73 min, 162 min, 202 min, 526 min
832768.fig.005d
(d) Spectra recorded at various times after mixing: 60 min, 260 min, 460 min, 660 min, 860 min, 1060 min, 1200 min