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Table 3 Dependence of the rate, kobs (× 104, s-1) on [CrIII(HIDA)(Arg)(H2O)2+]b, [IO4-] and temperature 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)
25°C 35°C 40°C 45°C 50°C 55°C
0.5 0.60 ± 0.02 0.75 ± 0.04 0.80 ± 0.01 0.92 ± 0.03 1.23 ± 0.02 1.33 ± 0.04
1.0 1.20 ± 0.01 1.43 ± 0.03 1.55 ± 0.02 1.83 ± 0.03 2.07 ± 0.05 2.42 ± 0.07
1.5 1.64 ± 0.03 2.00 ± 0.05 2.22 ± 0.03 2.57 ± 0.06 2.62 ± 0.07 3.25 ± 0.15
2.0 1.95 ± 0.06 2.48 ± 0.09 2.78 ± 0.08 3.30 ± 0.09 3.33 ± 0.08 3.83 ± 0.35
3.0 2.76 ± 0.04 3.33 ± 0.15 3.90 ± 0.12 4.27 ± 0.13 4.50 ± 0.15 5.00 ± 0.50
4.0 3.35 ± 0.05 3.83 ± 0.21 5.45 ± 0.18 6.23 ± 0.20 6.67 ± 0.30 6.92 ± 0.50
5.0 3.97 ± 0.08 5.00 ± 0.30 5.83 ± 0.25 6.67 ± 0.35 7.50 ± 0.40 8.23 ± 0.80
  1. b [CrIII(HIDA)(Arg)(H2O)2+] = 2.50 × 10-4 mol dm-3; 104kobs = 3.19 ± 0.07, 3.22 ± 0.10, 3.37 ± 0.08 and 3.25 ± 0.06 s-1 at 104 [CrIII(HIDA)(Arg)(H2O)2+] of 1.25, 3.75, 5.0 and 6.25 mol dm-3, respectively at 45°C and [IO4-] = 0.02 mol dm-3.