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Table 1 Variation of rate constant, kobs, with different concentrations of periodate and different temperatures. [CrIII(HIDA)(Val)(H2O)2+]a = 2.50 × 10-4 mol dm-3 at pH = 2.92 and I = 0.20 mol dm-3.

From: Inner-sphere oxidation of ternary iminodiacetatochromium(III) complexes involving DL-valine and L-arginine as secondary ligands. Isokinetic relationship for the oxidation of ternary iminodiacetato-chromium(III) complexes by periodate

102 [IO4-]
mol dm-3
104 kobs (s-1)
T = 25°C
35°C 40°C 45°C 50°C 55°C
0.5 0.80 ± 0.02 1.08 ± 0.03 1.17 ± 0.04 1.31 ± 0.05 1.54 ± 0.06 1.74 ± 0.05
1.0 1.38 ± 0.03 1.80 ± 0.04 2.02 ± 0.03 2.25 ± 0.04 2.57 ± 0.07 3.00 ± 0.10
1.5 1.69 ± 0.03 2.26 ± 0.02 2.75 ± 0.04 3.02 ± 0.03 3.31 ± 0.05 3.82 ± 0.15
2.0 2.05 ± 0.02 2.69 ± 0.05 2.96 ± 0.06 3.49 ± 0.06 4.18 ± 0.08 4.65 ± 0.22
3.0 2.43 ± 0.05 3.15 ± 0.04 3.68 ± 0.08 4.18 ± 0.08 4.81 ± 0.13 5.52 ± 0.30
4.0 2.77 ± 0.07 3.89 ± 0.05 4.46 ± 0.09 5.13 ± 0.11 6.52 ± 0.20 7.35 ± 0.50
5.0 3.24 ± 0.06 4.27 ± 0.07 5.08 ± 0.12 5.62 ± 0.15 7.09 ± 0.32 8.40 ± 0.60
  1. a [CrIII(HIDA)(Val)(H2O)2+] = 2.50 × 10-4 mol dm-3; 104kobs = 3.35 ± 0.04, 3.54 ± 0.07, 3.46 ± 0.06 and 3.50 ± 0.05 s-1 at 104 [CrIII(HIDA)(Val)(H2O)2+] of 1.25, 3.75, 5.00 and 6.25 mol dm-3, respectively at 45°C and [IO4-] = 0.02 mol dm-3.