Table II.
Apparent First-Order Rate Constants for the Photolysis of Riboflavin (k obs) in Organic Solvents and Water
Solvents | Acceptor number | Dielectric constant (ϵ) (25°C) | Inverse viscosity (mPa.s−1) (25°C) | k obs × 103 min−1 ± SD |
---|---|---|---|---|
Ethyl acetate | 17.1 | 6.02 | 2.268 | 3.19 ± 0.14 |
1-Butanol | 36.8 | 17.8 | 0.387 | 3.28 ± 0.13 |
1-Propanol | 37.3 | 20.1 | 0.514 | 3.34 ± 0.16 |
Ethanol | 37.1 | 24.3 | 0.931 | 3.45 ± 0.15 |
Methanol | 41.3 | 32.6 | 1.828 | 3.64 ± 0.17 |
Acetonitrile | 18.9 | 38.5 | 2.898 | 3.81 ± 0.16 |
Water | 54.8 | 78.5 | 1.123 | 4.61 ± 0.25 |
SD standard deviation