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Table 4 Effect of pH on kobs at [CrIII(HIDA)(Arg)(H2O)2+] = 2.50 × 10-4 mol dm-3 I = 0.20 mol dm-3, and T = 45°C.

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)
pH = 3.34
pH = 2.92 pH = 2.62 pH = 2.38
0.5 1.00 ± 0.04 0.92 ± 0.03 0.42 ± 0.01 0.35 ± 0.02
1.0 2.15 ± 0.06 1.83 ± 0.03 0.83 ± 0.01 0.60 ± 0.03
1.5 2.78 ± 0.08 2.57 ± 0.06 1.48 ± 0.03 1.03 ± 0.03
2.0 3.65 ± 0.12 3.30 ± 0.09 2.00 ± 0.06 1.35 ± 0.04
3.0 4.52 ± 0.2 4.27 ± 0.13 2.30 ± 0.05 2.00 ± 0.05
4.0 6.42 ± 0.3 6.23 ± 0.20 5.00 ± 0.09 3.33 ± 0.07
5.0 10.4 ± 0.7 6.67 ± 0.35 5.90 ± 0.15 3.92 ± 0.10