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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.
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BMC Chemistry

ISSN: 2661-801X

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